diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index f8e777ff4f3cb..e38d333291d15 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -6,7 +6,7 @@ If you are already familiar with Julia itself, this blog post by Katharine Hyatt
 
 ## Learning Julia
 
-[The learning page](https://julialang.org/learning) has a great list of resources for new and experienced users alike. [This tutorial video](https://www.youtube.com/watch?v=vWkgEddb4-A) is one recommended starting point, as is the "[Invitation to Julia](https://www.youtube.com/watch?v=gQ1y5NUD_RI)" workshop video from JuliaCon 2015  ([slide materials here](https://github.com/dpsanders/invitation_to_julia)). The [Julia documentation](https://docs.julialang.org/en/latest) covers the language and core library features, and is searchable.
+[The learning page](https://julialang.org/learning) has a great list of resources for new and experienced users alike. [This tutorial video](https://www.youtube.com/watch?v=vWkgEddb4-A) is one recommended starting point, as is the "[Invitation to Julia](https://www.youtube.com/watch?v=gQ1y5NUD_RI)" workshop video from JuliaCon 2015  ([slide materials here](https://github.com/dpsanders/invitation_to_julia)). The [Julia documentation](https://docs.julialang.org) covers the language and core library features, and is searchable.
 
 ## Before filing an issue
 
@@ -43,7 +43,7 @@ A useful bug report filed as a GitHub issue provides information about how to re
   - Try some simple debugging techniques to help isolate the problem.
     - Try running the code with the debug build of Julia with `make debug`, which produces the `usr/bin/julia-debug`.
     - Consider running `julia-debug` with a debugger such as `gdb` or `lldb`. Obtaining even a simple [backtrace](http://www.unknownroad.com/rtfm/gdbtut/gdbsegfault.html) is very useful.
-    - If Julia segfaults, try following [these debugging tips](https://docs.julialang.org/en/latest/devdocs/backtraces#Reporting-and-analyzing-crashes-(segfaults)-1) to help track down the specific origin of the bug.
+    - If Julia segfaults, try following [these debugging tips](https://docs.julialang.org/en/v1/devdocs/backtraces/) to help track down the specific origin of the bug.
 
 2. If the problem is caused by a Julia package rather than core Julia, file a bug report with the relevant package author rather than here.
 
@@ -86,7 +86,7 @@ There are never enough tests. Track [code coverage at Coveralls](https://coveral
 
 2. Browse through the source files and find some untested functionality (highlighted in red) that you think you might be able to write a test for.
 
-3. Write a test that exercises this functionality---you can add your test to one of the existing files, or start a new one, whichever seems most appropriate to you. If you're adding a new test file, make sure you include it in the list of tests in `test/choosetests.jl`. https://docs.julialang.org/en/latest/stdlib/Test/ may be helpful in explaining how the testing infrastructure works.
+3. Write a test that exercises this functionality---you can add your test to one of the existing files, or start a new one, whichever seems most appropriate to you. If you're adding a new test file, make sure you include it in the list of tests in `test/choosetests.jl`. https://docs.julialang.org/en/v1/stdlib/Test/ may be helpful in explaining how the testing infrastructure works.
 
 4. Run `make test-all` to rebuild Julia and run your new test(s). If you had to fix a bug or add functionality in `base`, this will ensure that your test passes and that you have not introduced extraneous whitespace.
 
diff --git a/Make.inc b/Make.inc
index 09263f6df7116..0e0187081c021 100644
--- a/Make.inc
+++ b/Make.inc
@@ -1010,13 +1010,17 @@ else
   UTF8PROC_INC := $(build_includedir)
 endif
 
+# We need python for things like BB triplet recognition.  We don't really care
+# about version, generally, so just find something that works:
+PYTHON := $(shell which python 2>/dev/null || which python3 2>/dev/null || which python2 2>/dev/null || echo not found)
+
 # BinaryBuilder options.  We default to "on" for all the projects listed in BB_PROJECTS,
 # but only if contrib/normalize_triplet.py works for our requested triplet.
-ifeq ($(shell python $(JULIAHOME)/contrib/normalize_triplet.py $(or $(XC_HOST),$(XC_HOST),$(BUILD_MACHINE)) >/dev/null 2>/dev/null; echo $$?),0)
+ifeq ($(shell $(PYTHON) $(JULIAHOME)/contrib/normalize_triplet.py $(or $(XC_HOST),$(XC_HOST),$(BUILD_MACHINE)) >/dev/null 2>/dev/null; echo $$?),0)
 USE_BINARYBUILDER ?= 1
 else
-ifneq ($(shell python $(JULIAHOME)/contrib/normalize_triplet.py x86_64-linux-gnu),x86_64-linux-gnu)
-$(warning python normalize_triplet.py appears to be non-functional, so BinaryBuilder disabled)
+ifneq ($(shell $(PYTHON) $(JULIAHOME)/contrib/normalize_triplet.py x86_64-linux-gnu),x86_64-linux-gnu)
+$(warning normalize_triplet.py appears to be non-functional (used python interpreter "$(PYTHON)"), so BinaryBuilder disabled)
 endif
 USE_BINARYBUILDER ?= 0
 endif
@@ -1340,11 +1344,9 @@ endif
 exec = $(shell $(call spawn,$(1)))
 
 JULIA_BUILD_MODE := release
-JULIA_LIBSUFFIX:=
 ifeq (,$(findstring release,$(MAKECMDGOALS)))
 ifneq (,$(findstring debug,$(MAKECMDGOALS)))
 JULIA_BUILD_MODE := debug
-JULIA_LIBSUFFIX:=-debug
 endif
 endif
 
@@ -1352,6 +1354,10 @@ JULIA_EXECUTABLE_debug := $(build_bindir)/julia-debug$(EXE)
 JULIA_EXECUTABLE_release := $(build_bindir)/julia$(EXE)
 JULIA_EXECUTABLE := $(JULIA_EXECUTABLE_$(JULIA_BUILD_MODE))
 
+JULIA_SYSIMG_debug := $(build_private_libdir)/sys-debug.$(SHLIB_EXT)
+JULIA_SYSIMG_release := $(build_private_libdir)/sys.$(SHLIB_EXT)
+JULIA_SYSIMG := $(JULIA_SYSIMG_$(JULIA_BUILD_MODE))
+
 # Colors for make
 ifndef VERBOSE
 VERBOSE := 0
diff --git a/Makefile b/Makefile
index 44c053ec3230f..df2e9c26ac3e6 100644
--- a/Makefile
+++ b/Makefile
@@ -571,8 +571,6 @@ distcleanall: cleanall
 test: check-whitespace $(JULIA_BUILD_MODE)
 	@$(MAKE) $(QUIET_MAKE) -C $(BUILDROOT)/test default JULIA_BUILD_MODE=$(JULIA_BUILD_MODE)
 
-JULIA_SYSIMG=$(build_private_libdir)/sys$(JULIA_LIBSUFFIX).$(SHLIB_EXT)
-
 testall: check-whitespace $(JULIA_BUILD_MODE)
 	cp $(JULIA_SYSIMG) $(BUILDROOT)/local.$(SHLIB_EXT)
 	$(call spawn,$(JULIA_EXECUTABLE) -J $(call cygpath_w,$(BUILDROOT)/local.$(SHLIB_EXT)) -e 'true')
diff --git a/README.md b/README.md
index ac4bc1e0f3fef..5a6388944656e 100644
--- a/README.md
+++ b/README.md
@@ -130,7 +130,7 @@ The Julia source code is organized as follows:
 ## Terminal, Editors and IDEs
 
 The Julia REPL is quite powerful.  See the section in the manual on
-[the Julia REPL](https://docs.julialang.org/en/latest/stdlib/REPL/)
+[the Julia REPL](https://docs.julialang.org/en/v1/stdlib/REPL/)
 for more details.
 
 Support for editing Julia is available for many
diff --git a/base/client.jl b/base/client.jl
index a6b07aadde5a7..5341c465bf9bb 100644
--- a/base/client.jl
+++ b/base/client.jl
@@ -427,7 +427,7 @@ using ..Base
 # include(fname::AbstractString) = Main.Base.include(Main, fname)
 function include(fname::AbstractString)
     mod = Main
-    isa(fname, String) || (fname = Base.convert(String, fname))
+    isa(fname, String) || (fname = Base.convert(String, fname)::String)
     path, prev = Base._include_dependency(mod, fname)
     for callback in Base.include_callbacks # to preserve order, must come before Core.include
         Base.invokelatest(callback, mod, path)
diff --git a/base/compiler/inferenceresult.jl b/base/compiler/inferenceresult.jl
index a466a00df89df..24206369b3018 100644
--- a/base/compiler/inferenceresult.jl
+++ b/base/compiler/inferenceresult.jl
@@ -35,9 +35,13 @@ function matching_cache_argtypes(linfo::MethodInstance, given_argtypes::Vector)
     if linfo.def.isva
         isva_given_argtypes = Vector{Any}(undef, nargs)
         for i = 1:(nargs - 1)
-            isva_given_argtypes[i] = given_argtypes[i]
+            isva_given_argtypes[i] = argtype_by_index(given_argtypes, i)
+        end
+        if length(given_argtypes) >= nargs || !isvarargtype(given_argtypes[end])
+            isva_given_argtypes[nargs] = tuple_tfunc(given_argtypes[nargs:end])
+        else
+            isva_given_argtypes[nargs] = tuple_tfunc(given_argtypes[end:end])
         end
-        isva_given_argtypes[nargs] = tuple_tfunc(given_argtypes[nargs:end])
         given_argtypes = isva_given_argtypes
     end
     cache_argtypes, overridden_by_const = matching_cache_argtypes(linfo, nothing)
diff --git a/base/iterators.jl b/base/iterators.jl
index 7f8525d8e1d82..891c413ee3970 100644
--- a/base/iterators.jl
+++ b/base/iterators.jl
@@ -98,7 +98,6 @@ reverse(G::Generator) = Generator(G.f, reverse(G.iter))
 reverse(r::Reverse) = r.itr
 reverse(x::Union{Number,AbstractChar}) = x
 reverse(p::Pair) = Base.reverse(p) # copying pairs is cheap
-reverse(xs::Tuple) = Base.reverse(xs) # allows inference in mapfoldr and similar
 
 iterate(r::Reverse{<:Tuple}, i::Int = length(r.itr)) = i < 1 ? nothing : (r.itr[i], i-1)
 
diff --git a/base/loading.jl b/base/loading.jl
index f8771afc58a69..cc4153e9a31e6 100644
--- a/base/loading.jl
+++ b/base/loading.jl
@@ -1086,8 +1086,8 @@ include_string(m::Module, txt::AbstractString, fname::AbstractString="string") =
 
 function source_path(default::Union{AbstractString,Nothing}="")
     s = current_task().storage
-    if s !== nothing && haskey(s, :SOURCE_PATH)
-        return s[:SOURCE_PATH]
+    if s !== nothing && haskey(s::IdDict{Any,Any}, :SOURCE_PATH)
+        return s[:SOURCE_PATH]::Union{Nothing,String}
     end
     return default
 end
@@ -1264,6 +1264,8 @@ function compilecache(pkg::PkgId, path::String)
         open(cachefile, "a+") do f
             write(f, _crc32c(seekstart(f)))
         end
+        # inherit permission from the source file
+        chmod(cachefile, filemode(path) & 0o777)
     elseif p.exitcode == 125
         return PrecompilableError()
     else
@@ -1485,7 +1487,7 @@ Alternatively see [`PROGRAM_FILE`](@ref).
 """
 macro __FILE__()
     __source__.file === nothing && return nothing
-    return String(__source__.file)
+    return String(__source__.file::Symbol)
 end
 
 """
@@ -1497,6 +1499,6 @@ Return the current working directory if run from a REPL or if evaluated by `juli
 """
 macro __DIR__()
     __source__.file === nothing && return nothing
-    _dirname = dirname(String(__source__.file))
+    _dirname = dirname(String(__source__.file::Symbol))
     return isempty(_dirname) ? pwd() : abspath(_dirname)
 end
diff --git a/base/logging.jl b/base/logging.jl
index 0de8ae9337374..517bcd3e0d5b4 100644
--- a/base/logging.jl
+++ b/base/logging.jl
@@ -204,7 +204,7 @@ end
 macro _sourceinfo()
     esc(quote
         (__module__,
-         __source__.file === nothing ? "?" : String(__source__.file),
+         __source__.file === nothing ? "?" : String(__source__.file::Symbol),
          __source__.line)
     end)
 end
@@ -248,6 +248,8 @@ function log_record_id(_module, level, message, log_kws)
     end
 end
 
+default_group(file) = Symbol(splitext(basename(file))[1])
+
 # Generate code for logging macros
 function logmsg_code(_module, file, line, level, message, exs...)
     id = Expr(:quote, log_record_id(_module, level, message, exs))
@@ -293,12 +295,12 @@ function logmsg_code(_module, file, line, level, message, exs...)
     if group === nothing
         group = if isdefined(Base, :basename) && isa(file, String)
             # precompute if we can
-            QuoteNode(splitext(basename(file))[1])
+            QuoteNode(default_group(file))
         else
             # memoized run-time execution
             ref = Ref{Symbol}()
             :(isassigned($ref) ? $ref[]
-                               : $ref[] = Symbol(splitext(basename(something($file, "")))[1]))
+                               : $ref[] = default_group(something($file, "")))
         end
     end
 
diff --git a/base/math.jl b/base/math.jl
index c3429723db932..85574e22f69b6 100644
--- a/base/math.jl
+++ b/base/math.jl
@@ -613,9 +613,19 @@ julia> hypot(3, 4im)
 hypot(x::Number, y::Number) = hypot(promote(x, y)...)
 hypot(x::Complex, y::Complex) = hypot(abs(x), abs(y))
 hypot(x::T, y::T) where {T<:Real} = hypot(float(x), float(y))
-hypot(x::T, y::T) where {T<:Number} = (z = y/x; abs(x) * sqrt(one(z) + z*z))
+function hypot(x::T, y::T) where {T<:Number}
+    if !iszero(x)
+        z = y/x
+        z2 = z*z
+
+        abs(x) * sqrt(oneunit(z2) + z2)
+    else
+        abs(y)
+    end
+end
+
 function hypot(x::T, y::T) where T<:AbstractFloat
-    #Return Inf if either or both imputs is Inf (Compliance with IEEE754)
+    # Return Inf if either or both inputs is Inf (Compliance with IEEE754)
     if isinf(x) || isinf(y)
         return T(Inf)
     end
diff --git a/base/reduce.jl b/base/reduce.jl
index c89e7b8763547..b61a8357d9b0e 100644
--- a/base/reduce.jl
+++ b/base/reduce.jl
@@ -178,9 +178,12 @@ foldl(op, itr; kw...) = mapfoldl(identity, op, itr; kw...)
 
 function mapfoldr_impl(f, op, nt, itr)
     op′, itr′ = _xfadjoint(BottomRF(FlipArgs(op)), Generator(f, itr))
-    return foldl_impl(op′, nt, Iterators.reverse(itr′))
+    return foldl_impl(op′, nt, _reverse(itr′))
 end
 
+_reverse(itr) = Iterators.reverse(itr)
+_reverse(itr::Tuple) = reverse(itr)  #33235
+
 struct FlipArgs{F}
     f::F
 end
diff --git a/base/reducedim.jl b/base/reducedim.jl
index a448931499fc5..a66cb09cfe5c5 100644
--- a/base/reducedim.jl
+++ b/base/reducedim.jl
@@ -4,7 +4,7 @@
 
 # for reductions that expand 0 dims to 1
 reduced_index(i::OneTo) = OneTo(1)
-reduced_index(i::Union{Slice, IdentityUnitRange}) = first(i):first(i)
+reduced_index(i::Union{Slice, IdentityUnitRange}) = oftype(i, first(i):first(i))
 reduced_index(i::AbstractUnitRange) =
     throw(ArgumentError(
 """
diff --git a/base/reflection.jl b/base/reflection.jl
index df3368022fc09..4f83dfa500d6a 100644
--- a/base/reflection.jl
+++ b/base/reflection.jl
@@ -319,8 +319,8 @@ struct DataTypeLayout
     nfields::UInt32
     npointers::UInt32
     firstptr::Int32
-    alignment::UInt32
-    # alignment : 9;
+    alignment::UInt16
+    flags::UInt16
     # haspadding : 1;
     # fielddesc_type : 2;
 end
@@ -335,7 +335,7 @@ function datatype_alignment(dt::DataType)
     @_pure_meta
     dt.layout == C_NULL && throw(UndefRefError())
     alignment = unsafe_load(convert(Ptr{DataTypeLayout}, dt.layout)).alignment
-    return Int(alignment & 0x1FF)
+    return Int(alignment)
 end
 
 # amount of total space taken by T when stored in a container
@@ -368,8 +368,8 @@ Can be called on any `isconcretetype`.
 function datatype_haspadding(dt::DataType)
     @_pure_meta
     dt.layout == C_NULL && throw(UndefRefError())
-    alignment = unsafe_load(convert(Ptr{DataTypeLayout}, dt.layout)).alignment
-    return (alignment >> 9) & 1 == 1
+    flags = unsafe_load(convert(Ptr{DataTypeLayout}, dt.layout)).flags
+    return flags & 1 == 1
 end
 
 """
@@ -397,8 +397,8 @@ See also [`fieldoffset`](@ref).
 function datatype_fielddesc_type(dt::DataType)
     @_pure_meta
     dt.layout == C_NULL && throw(UndefRefError())
-    alignment = unsafe_load(convert(Ptr{DataTypeLayout}, dt.layout)).alignment
-    return (alignment >> 10) & 3
+    flags = unsafe_load(convert(Ptr{DataTypeLayout}, dt.layout)).flags
+    return (flags >> 1) & 3
 end
 
 """
diff --git a/base/show.jl b/base/show.jl
index a2eb5664ab223..784ad04904c07 100644
--- a/base/show.jl
+++ b/base/show.jl
@@ -1580,11 +1580,17 @@ function show_unquoted(io::IO, ex::Expr, indent::Int, prec::Int, quote_level::In
             print(io, '(')
             ind = indent + indent_width
             for i = 1:length(ex.args)
-                i > 1 && print(io, ";\n", ' '^ind)
+                if i > 1
+                    # if there was only a comment before the first semicolon, the expression would get parsed as a NamedTuple
+                    if !(i == 2 && ex.args[1] isa LineNumberNode)
+                        print(io, ';')
+                    end
+                    print(io, "\n", ' '^ind)
+                end
                 show_unquoted(io, ex.args[i], ind, -1, quote_level)
             end
             if length(ex.args) < 2
-                print(isempty(ex.args) ? "nothing;)" : ";)")
+                print(io, isempty(ex.args) ? "nothing;)" : ";)")
             else
                 print(io, ')')
             end
@@ -2055,13 +2061,13 @@ alignment(io::IO, x::Number) = (length(sprint(show, x, context=io, sizehint=0)),
 alignment(io::IO, x::Integer) = (length(sprint(show, x, context=io, sizehint=0)), 0)
 "`alignment(4.23)` yields (1,3) for `4` and `.23`"
 function alignment(io::IO, x::Real)
-    m = match(r"^(.*?)((?:[\.eE].*)?)$", sprint(show, x, context=io, sizehint=0))
+    m = match(r"^(.*?)((?:[\.eEfF].*)?)$", sprint(show, x, context=io, sizehint=0))
     m === nothing ? (length(sprint(show, x, context=io, sizehint=0)), 0) :
                    (length(m.captures[1]), length(m.captures[2]))
 end
 "`alignment(1 + 10im)` yields (3,5) for `1 +` and `_10im` (plus sign on left, space on right)"
 function alignment(io::IO, x::Complex)
-    m = match(r"^(.*[^e][\+\-])(.*)$", sprint(show, x, context=io, sizehint=0))
+    m = match(r"^(.*[^ef][\+\-])(.*)$", sprint(show, x, context=io, sizehint=0))
     m === nothing ? (length(sprint(show, x, context=io, sizehint=0)), 0) :
                    (length(m.captures[1]), length(m.captures[2]))
 end
diff --git a/deps/Versions.make b/deps/Versions.make
index 74d802921fb0c..af87ef5cf48b0 100644
--- a/deps/Versions.make
+++ b/deps/Versions.make
@@ -5,7 +5,7 @@ PCRE_BB_REL = 0
 DSFMT_VER = 2.2.3
 DSFMT_BB_REL = 0
 OPENBLAS_VER = 0.3.5
-OPENBLAS_BB_REL = 0
+OPENBLAS_BB_REL = 1
 LAPACK_VER = 3.5.0
 SUITESPARSE_VER = 5.4.0
 SUITESPARSE_BB_REL = 2
diff --git a/deps/checksums/LLVM.asserts.v8.0.1-4.aarch64-linux-gnu-gcc4.tar.gz/md5 b/deps/checksums/LLVM.asserts.v8.0.1-4.aarch64-linux-gnu-gcc4.tar.gz/md5
new file mode 100644
index 0000000000000..9c5324bd5236f
--- /dev/null
+++ b/deps/checksums/LLVM.asserts.v8.0.1-4.aarch64-linux-gnu-gcc4.tar.gz/md5
@@ -0,0 +1 @@
+0740cc29f22c662e265737045e637112
diff --git a/deps/checksums/LLVM.asserts.v8.0.1-4.aarch64-linux-gnu-gcc4.tar.gz/sha512 b/deps/checksums/LLVM.asserts.v8.0.1-4.aarch64-linux-gnu-gcc4.tar.gz/sha512
new file mode 100644
index 0000000000000..15a671a094197
--- /dev/null
+++ b/deps/checksums/LLVM.asserts.v8.0.1-4.aarch64-linux-gnu-gcc4.tar.gz/sha512
@@ -0,0 +1 @@
+2aafd248b82de55dccdec65fea088c1726967fbdae01afd251645349fcbc0da01893dce714a93a644d6f0e051aba05d43cec84c49dfb73b41a9532754886a518
diff --git a/deps/checksums/LLVM.asserts.v8.0.1-4.aarch64-linux-gnu-gcc7.tar.gz/md5 b/deps/checksums/LLVM.asserts.v8.0.1-4.aarch64-linux-gnu-gcc7.tar.gz/md5
new file mode 100644
index 0000000000000..ad842024388f2
--- /dev/null
+++ b/deps/checksums/LLVM.asserts.v8.0.1-4.aarch64-linux-gnu-gcc7.tar.gz/md5
@@ -0,0 +1 @@
+89ce36300ffd0f2bc1aeddcf019a3aa4
diff --git a/deps/checksums/LLVM.asserts.v8.0.1-4.aarch64-linux-gnu-gcc7.tar.gz/sha512 b/deps/checksums/LLVM.asserts.v8.0.1-4.aarch64-linux-gnu-gcc7.tar.gz/sha512
new file mode 100644
index 0000000000000..e7fb20ff26121
--- /dev/null
+++ b/deps/checksums/LLVM.asserts.v8.0.1-4.aarch64-linux-gnu-gcc7.tar.gz/sha512
@@ -0,0 +1 @@
+3d24df343627777c8adb7ffd90379cdbfc48fdbdf7fe2aae8b8a4ad83c534cce6958a23eaeba9d703f4f00f293d36c8d618c930d66e3fc04dd9b745ad8aa447f
diff --git a/deps/checksums/LLVM.asserts.v8.0.1-4.aarch64-linux-gnu-gcc8.tar.gz/md5 b/deps/checksums/LLVM.asserts.v8.0.1-4.aarch64-linux-gnu-gcc8.tar.gz/md5
new file mode 100644
index 0000000000000..fad791ab5aed2
--- /dev/null
+++ b/deps/checksums/LLVM.asserts.v8.0.1-4.aarch64-linux-gnu-gcc8.tar.gz/md5
@@ -0,0 +1 @@
+0bb8ede857f498c5c4b2b7c1cdfab22f
diff --git a/deps/checksums/LLVM.asserts.v8.0.1-4.aarch64-linux-gnu-gcc8.tar.gz/sha512 b/deps/checksums/LLVM.asserts.v8.0.1-4.aarch64-linux-gnu-gcc8.tar.gz/sha512
new file mode 100644
index 0000000000000..54e79b5f47140
--- /dev/null
+++ b/deps/checksums/LLVM.asserts.v8.0.1-4.aarch64-linux-gnu-gcc8.tar.gz/sha512
@@ -0,0 +1 @@
+01923975b5121e9ec144d6110a4072d51a764eae8cb4de3dd4af6698759832342fbf56c7b2102097e4fd1e79df0bf05935b58af6fd8ca6ee81637876fddf8bb8
diff --git a/deps/checksums/LLVM.asserts.v8.0.1-4.arm-linux-gnueabihf-gcc4.tar.gz/md5 b/deps/checksums/LLVM.asserts.v8.0.1-4.arm-linux-gnueabihf-gcc4.tar.gz/md5
new file mode 100644
index 0000000000000..47588d301ea18
--- /dev/null
+++ b/deps/checksums/LLVM.asserts.v8.0.1-4.arm-linux-gnueabihf-gcc4.tar.gz/md5
@@ -0,0 +1 @@
+0c9eb5839c0e41fef06c390cba6bc032
diff --git a/deps/checksums/LLVM.asserts.v8.0.1-4.arm-linux-gnueabihf-gcc4.tar.gz/sha512 b/deps/checksums/LLVM.asserts.v8.0.1-4.arm-linux-gnueabihf-gcc4.tar.gz/sha512
new file mode 100644
index 0000000000000..b72c3a7ceec06
--- /dev/null
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+++ b/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-linux-gnu-gcc4.tar.gz/sha512
@@ -0,0 +1 @@
+381fd4b554682755e7e76aa0853408c2bbe6bec8ec752483f771fcee7e974cc9da08ad04b67be2858ca162259a4aae83471d8f1caceb493a6fdf57eaf48f74e2
diff --git a/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-linux-gnu-gcc7.tar.gz/md5 b/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-linux-gnu-gcc7.tar.gz/md5
new file mode 100644
index 0000000000000..dbd586922d529
--- /dev/null
+++ b/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-linux-gnu-gcc7.tar.gz/md5
@@ -0,0 +1 @@
+39c39519a806c4ba5da9c31692f503bc
diff --git a/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-linux-gnu-gcc7.tar.gz/sha512 b/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-linux-gnu-gcc7.tar.gz/sha512
new file mode 100644
index 0000000000000..89cb26d74a3dd
--- /dev/null
+++ b/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-linux-gnu-gcc7.tar.gz/sha512
@@ -0,0 +1 @@
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diff --git a/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-linux-gnu-gcc8.tar.gz/md5 b/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-linux-gnu-gcc8.tar.gz/md5
new file mode 100644
index 0000000000000..b49a6745a9030
--- /dev/null
+++ b/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-linux-gnu-gcc8.tar.gz/md5
@@ -0,0 +1 @@
+0142970d754e2006ef86a94c51ff2875
diff --git a/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-linux-gnu-gcc8.tar.gz/sha512 b/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-linux-gnu-gcc8.tar.gz/sha512
new file mode 100644
index 0000000000000..3e3bea7e159a7
--- /dev/null
+++ b/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-linux-gnu-gcc8.tar.gz/sha512
@@ -0,0 +1 @@
+e56cb6f67e43eec60207d700f4a4b9a0b84f5b988792ab4ca2c2559045ff2966e4ece95da2abe545fe2f9317ddc57afc4be41866dc319435fc7add74b6e3e3d7
diff --git a/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-linux-musl-gcc4.tar.gz/md5 b/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-linux-musl-gcc4.tar.gz/md5
new file mode 100644
index 0000000000000..e6bbaaaa4596a
--- /dev/null
+++ b/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-linux-musl-gcc4.tar.gz/md5
@@ -0,0 +1 @@
+824ce91e7e4c63304a741e9813d72d3d
diff --git a/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-linux-musl-gcc4.tar.gz/sha512 b/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-linux-musl-gcc4.tar.gz/sha512
new file mode 100644
index 0000000000000..eeb6e4190d6a5
--- /dev/null
+++ b/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-linux-musl-gcc4.tar.gz/sha512
@@ -0,0 +1 @@
+3a7b88c18a457c25d71f59c037b9c483d81ba408cd2d8e01acb79e56faf197062dd92343f8dc1439ad726d26b7de60dd86b336af5ef1cec1f5d469212d2bf557
diff --git a/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-linux-musl-gcc7.tar.gz/md5 b/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-linux-musl-gcc7.tar.gz/md5
new file mode 100644
index 0000000000000..a4c43db9d9b4b
--- /dev/null
+++ b/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-linux-musl-gcc7.tar.gz/md5
@@ -0,0 +1 @@
+b2024e2cf83e8a15272d373639dae4a3
diff --git a/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-linux-musl-gcc7.tar.gz/sha512 b/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-linux-musl-gcc7.tar.gz/sha512
new file mode 100644
index 0000000000000..4331d7b9842eb
--- /dev/null
+++ b/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-linux-musl-gcc7.tar.gz/sha512
@@ -0,0 +1 @@
+5e982c38501ffdf2424189e7d9510ad4397b6bd72b1b39b80eae048b6fe7435540973138a3d15258c4cfbe4b8d2cac507e5aacd2a9c579753e540b8b466a81dc
diff --git a/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-linux-musl-gcc8.tar.gz/md5 b/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-linux-musl-gcc8.tar.gz/md5
new file mode 100644
index 0000000000000..30afa4267ca93
--- /dev/null
+++ b/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-linux-musl-gcc8.tar.gz/md5
@@ -0,0 +1 @@
+b8233eba5d2e69d84a53c0dfbe96c797
diff --git a/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-linux-musl-gcc8.tar.gz/sha512 b/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-linux-musl-gcc8.tar.gz/sha512
new file mode 100644
index 0000000000000..bdc7ae6f1d744
--- /dev/null
+++ b/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-linux-musl-gcc8.tar.gz/sha512
@@ -0,0 +1 @@
+419e943b1242208f172b668534473ff8760c9de8e7b5478486c2299bd8396488ac7c574965740b7523c5703168f4c968986eef331bb070b0ee3af55a764da643
diff --git a/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-unknown-freebsd11.1-gcc4.tar.gz/md5 b/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-unknown-freebsd11.1-gcc4.tar.gz/md5
new file mode 100644
index 0000000000000..ca84e2fea0fad
--- /dev/null
+++ b/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-unknown-freebsd11.1-gcc4.tar.gz/md5
@@ -0,0 +1 @@
+119786c4238669e70cbb202f57e18097
diff --git a/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-unknown-freebsd11.1-gcc4.tar.gz/sha512 b/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-unknown-freebsd11.1-gcc4.tar.gz/sha512
new file mode 100644
index 0000000000000..f794a3b15d4d3
--- /dev/null
+++ b/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-unknown-freebsd11.1-gcc4.tar.gz/sha512
@@ -0,0 +1 @@
+18b3a57d4dd71938483d6e1720192e1d1235eefcbe502f49eba0f7d4898c08876fc92f6aec9330ed1e2c8a918568a9149dea88e761ef1effc90916b23b8ef2a4
diff --git a/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-unknown-freebsd11.1-gcc7.tar.gz/md5 b/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-unknown-freebsd11.1-gcc7.tar.gz/md5
new file mode 100644
index 0000000000000..b680081f8ae2e
--- /dev/null
+++ b/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-unknown-freebsd11.1-gcc7.tar.gz/md5
@@ -0,0 +1 @@
+6b9f214df55cba9ffc49c3a32b340a66
diff --git a/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-unknown-freebsd11.1-gcc7.tar.gz/sha512 b/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-unknown-freebsd11.1-gcc7.tar.gz/sha512
new file mode 100644
index 0000000000000..71ebef42c0ed0
--- /dev/null
+++ b/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-unknown-freebsd11.1-gcc7.tar.gz/sha512
@@ -0,0 +1 @@
+e486f11c6b1c8941d4613422a2a764ba655882320ee0373b04adceb080e93bb6ed46c20890b1ed86378f5c51e183f92b7c5fd63c228ec9c74764b830113c1427
diff --git a/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-unknown-freebsd11.1-gcc8.tar.gz/md5 b/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-unknown-freebsd11.1-gcc8.tar.gz/md5
new file mode 100644
index 0000000000000..a054ecbb63da8
--- /dev/null
+++ b/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-unknown-freebsd11.1-gcc8.tar.gz/md5
@@ -0,0 +1 @@
+088622a020360fc4c24c26e096a74cad
diff --git a/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-unknown-freebsd11.1-gcc8.tar.gz/sha512 b/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-unknown-freebsd11.1-gcc8.tar.gz/sha512
new file mode 100644
index 0000000000000..6b3df5a363706
--- /dev/null
+++ b/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-unknown-freebsd11.1-gcc8.tar.gz/sha512
@@ -0,0 +1 @@
+2b00c525e1a038d43b39151672245cef881e3713b59014e7a85eefc17a13b94064b60e618b09c7452fcca554a015bb294f746547d19a692ea2276bbc7fc32846
diff --git a/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-w64-mingw32-gcc4.tar.gz/md5 b/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-w64-mingw32-gcc4.tar.gz/md5
new file mode 100644
index 0000000000000..dbb17af8d63b9
--- /dev/null
+++ b/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-w64-mingw32-gcc4.tar.gz/md5
@@ -0,0 +1 @@
+5aae708824826fb624440dfa9bdeff23
diff --git a/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-w64-mingw32-gcc4.tar.gz/sha512 b/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-w64-mingw32-gcc4.tar.gz/sha512
new file mode 100644
index 0000000000000..3045e916bd683
--- /dev/null
+++ b/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-w64-mingw32-gcc4.tar.gz/sha512
@@ -0,0 +1 @@
+db15905d0255d645e178b85450ced8736bd96c5f94900a81c5b0d7c3a18ce26dd1b594f2f4dcc04662d529ae8c59fe2e8c08ea748330dc0de3f2be9d4eb1689a
diff --git a/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-w64-mingw32-gcc7.tar.gz/md5 b/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-w64-mingw32-gcc7.tar.gz/md5
new file mode 100644
index 0000000000000..db6108d31aaf0
--- /dev/null
+++ b/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-w64-mingw32-gcc7.tar.gz/md5
@@ -0,0 +1 @@
+426b68729a688e5256396a979ea704d5
diff --git a/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-w64-mingw32-gcc7.tar.gz/sha512 b/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-w64-mingw32-gcc7.tar.gz/sha512
new file mode 100644
index 0000000000000..cf7d07a7893c4
--- /dev/null
+++ b/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-w64-mingw32-gcc7.tar.gz/sha512
@@ -0,0 +1 @@
+840b961fb389d5090ea17fcf4d4a8a9c43160355e2a0622342cf8e24d0d3f8d1e65285058ba1ef54881997b0b122d328e5e08c41ecb5eaeddd0a0f75806927e7
diff --git a/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-w64-mingw32-gcc8.tar.gz/md5 b/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-w64-mingw32-gcc8.tar.gz/md5
new file mode 100644
index 0000000000000..60672232bc808
--- /dev/null
+++ b/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-w64-mingw32-gcc8.tar.gz/md5
@@ -0,0 +1 @@
+d3e4d22ec02cace792dc2ac5ec62cfe4
diff --git a/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-w64-mingw32-gcc8.tar.gz/sha512 b/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-w64-mingw32-gcc8.tar.gz/sha512
new file mode 100644
index 0000000000000..c1986634a6e13
--- /dev/null
+++ b/deps/checksums/OpenBLAS.v0.3.5-1.x86_64-w64-mingw32-gcc8.tar.gz/sha512
@@ -0,0 +1 @@
+e719cdb2660b51a79c83dfe23dddb296a2fc788af3b2cfd5cfbe4d603de53325f92386402e02644717a80167a1aa1d8743b078dbf42614bac73a7c23032cdf9e
diff --git a/deps/checksums/Pkg-9419c70af69153cd5c4276bff90fbb135e0aa3f1.tar.gz/md5 b/deps/checksums/Pkg-9419c70af69153cd5c4276bff90fbb135e0aa3f1.tar.gz/md5
new file mode 100644
index 0000000000000..6a1f3e9c17528
--- /dev/null
+++ b/deps/checksums/Pkg-9419c70af69153cd5c4276bff90fbb135e0aa3f1.tar.gz/md5
@@ -0,0 +1 @@
+a107b2b69d899e5191e7cdbff263df10
diff --git a/deps/checksums/Pkg-9419c70af69153cd5c4276bff90fbb135e0aa3f1.tar.gz/sha512 b/deps/checksums/Pkg-9419c70af69153cd5c4276bff90fbb135e0aa3f1.tar.gz/sha512
new file mode 100644
index 0000000000000..0e6d8858a9675
--- /dev/null
+++ b/deps/checksums/Pkg-9419c70af69153cd5c4276bff90fbb135e0aa3f1.tar.gz/sha512
@@ -0,0 +1 @@
+beab318b1cf96a2f0957f26d33f2d06e6dfabed405778f3945caf6372cc62ed74ff069e912475f3e553cf3013db73a2c73f2a758a3e3b1ba21db0471b7182dbe
diff --git a/deps/checksums/Pkg-a1eea5d5bd6493eb233b8e7abcdae6fc7e5751e1.tar.gz/md5 b/deps/checksums/Pkg-a1eea5d5bd6493eb233b8e7abcdae6fc7e5751e1.tar.gz/md5
deleted file mode 100644
index bfad529f9b9e1..0000000000000
--- a/deps/checksums/Pkg-a1eea5d5bd6493eb233b8e7abcdae6fc7e5751e1.tar.gz/md5
+++ /dev/null
@@ -1 +0,0 @@
-7d40c950e852131184c0af6376d14f3d
diff --git a/deps/checksums/Pkg-a1eea5d5bd6493eb233b8e7abcdae6fc7e5751e1.tar.gz/sha512 b/deps/checksums/Pkg-a1eea5d5bd6493eb233b8e7abcdae6fc7e5751e1.tar.gz/sha512
deleted file mode 100644
index 51db8e03fad6c..0000000000000
--- a/deps/checksums/Pkg-a1eea5d5bd6493eb233b8e7abcdae6fc7e5751e1.tar.gz/sha512
+++ /dev/null
@@ -1 +0,0 @@
-71a811bcae23fb8999ea4eeb5d878f9bc769c9cc4e940c987d89ee82bb706d7ff4abd5151a9e0053367137488e682e4c8b4bb382fa981895d47ba44f120f5c73
diff --git a/deps/tools/bb-install.mk b/deps/tools/bb-install.mk
index 4b6ceb064fc34..e59da7cdcacdb 100644
--- a/deps/tools/bb-install.mk
+++ b/deps/tools/bb-install.mk
@@ -5,8 +5,7 @@
 #    4 cxx11)                  # signifies a cxx11 ABI dependency
 
 # Auto-detect triplet once, create different versions that we use as defaults below for each BB install target
-# This is much more efficient than launching `gcc` and `python` once for each BB install target.
-BB_TRIPLET_GCCABI_CXXABI := $(shell python $(JULIAHOME)/contrib/normalize_triplet.py $(or $(XC_HOST),$(XC_HOST),$(BUILD_MACHINE)) "$(shell $(FC) --version | head -1)" "$(shell echo '\#include <string>' | $(CXX) $(CXXFLAGS) -x c++ -dM -E - | grep _GLIBCXX_USE_CXX11_ABI | awk '{ print $$3 }' )")
+BB_TRIPLET_GCCABI_CXXABI := $(shell $(PYTHON) $(JULIAHOME)/contrib/normalize_triplet.py $(or $(XC_HOST),$(XC_HOST),$(BUILD_MACHINE)) "$(shell $(FC) --version | head -1)" "$(shell echo '\#include <string>' | $(CXX) $(CXXFLAGS) -x c++ -dM -E - | grep _GLIBCXX_USE_CXX11_ABI | awk '{ print $$3 }' )")
 BB_TRIPLET_GCCABI := $(subst $(SPACE),-,$(filter-out cxx%,$(subst -,$(SPACE),$(BB_TRIPLET_GCCABI_CXXABI))))
 BB_TRIPLET_CXXABI := $(subst $(SPACE),-,$(filter-out gcc%,$(subst -,$(SPACE),$(BB_TRIPLET_GCCABI_CXXABI))))
 BB_TRIPLET := $(subst $(SPACE),-,$(filter-out cxx%,$(filter-out gcc%,$(subst -,$(SPACE),$(BB_TRIPLET_GCCABI_CXXABI)))))
diff --git a/deps/tools/find_python2 b/deps/tools/find_python2
deleted file mode 100755
index 88d1410e47f18..0000000000000
--- a/deps/tools/find_python2
+++ /dev/null
@@ -1,16 +0,0 @@
-#!/bin/sh
-#
-# LLVM requires 2.7 <= python2 < 3
-#
-
-valid_python() {
-    $1 -c 'import sys; sys.exit(not (sys.version_info >= (2,7) and sys.version_info < (3,0)))' 2> /dev/null
-}
-
-for python in python python2 python2.7 python27; do
-    if valid_python $python; then
-        echo `which $python`
-        break
-    fi
-done
-
diff --git a/doc/Manifest.toml b/doc/Manifest.toml
index 02381c6737de8..1499098e1ee1e 100644
--- a/doc/Manifest.toml
+++ b/doc/Manifest.toml
@@ -19,9 +19,9 @@ version = "0.8.1"
 
 [[Documenter]]
 deps = ["Base64", "Dates", "DocStringExtensions", "InteractiveUtils", "JSON", "LibGit2", "Logging", "Markdown", "REPL", "Test", "Unicode"]
-git-tree-sha1 = "7f6ad432deb42aa108bc79205ee96d28724b084f"
+git-tree-sha1 = "51f0c7df46abb9c07d80e529718951e634670afb"
 uuid = "e30172f5-a6a5-5a46-863b-614d45cd2de4"
-version = "0.24.1"
+version = "0.24.4"
 
 [[DocumenterLaTeX]]
 deps = ["Documenter", "Test"]
@@ -40,8 +40,12 @@ uuid = "682c06a0-de6a-54ab-a142-c8b1cf79cde6"
 version = "0.21.0"
 
 [[LibGit2]]
+deps = ["Printf"]
 uuid = "76f85450-5226-5b5a-8eaa-529ad045b433"
 
+[[Libdl]]
+uuid = "8f399da3-3557-5675-b5ff-fb832c97cbdb"
+
 [[Logging]]
 uuid = "56ddb016-857b-54e1-b83d-db4d58db5568"
 
@@ -59,7 +63,7 @@ uuid = "69de0a69-1ddd-5017-9359-2bf0b02dc9f0"
 version = "0.3.10"
 
 [[Pkg]]
-deps = ["Dates", "LibGit2", "Markdown", "Printf", "REPL", "Random", "SHA", "UUIDs"]
+deps = ["Dates", "LibGit2", "Libdl", "Logging", "Markdown", "Printf", "REPL", "Random", "SHA", "UUIDs"]
 uuid = "44cfe95a-1eb2-52ea-b672-e2afdf69b78f"
 
 [[Printf]]
diff --git a/doc/README.md b/doc/README.md
index c1541ddc7b747..be5426018084d 100644
--- a/doc/README.md
+++ b/doc/README.md
@@ -1,6 +1,6 @@
 # Julia Documentation README
 
-Julia's documentation is written in Markdown. A reference of all supported syntax can be found in the [manual](https://docs.julialang.org/en/latest/stdlib/Markdown/). All documentation can be found in the Markdown files in `doc/src/` and the docstrings in Julia source files in `base/`.
+Julia's documentation is written in Markdown. A reference of all supported syntax can be found in the [manual](https://docs.julialang.org/en/v1/stdlib/Markdown/). All documentation can be found in the Markdown files in `doc/src/` and the docstrings in Julia source files in `base/` and `stdlib/`.
 
 ## Requirements
 
diff --git a/doc/src/manual/parallel-computing.md b/doc/src/manual/parallel-computing.md
index 84279a7b3415a..35d131f3a676a 100644
--- a/doc/src/manual/parallel-computing.md
+++ b/doc/src/manual/parallel-computing.md
@@ -394,7 +394,7 @@ julia> acc[]
 When using multi-threading we have to be careful when using functions that are not
 [pure](https://en.wikipedia.org/wiki/Pure_function) as we might get a wrong answer.
 For instance functions that have their
-[name ending with `!`](https://docs.julialang.org/en/latest/manual/style-guide/#Append-!-to-names-of-functions-that-modify-their-arguments-1)
+[name ending with `!`](@ref bang-convention)
 by convention modify their arguments and thus are not pure. However, there are
 functions that have side effects and their name does not end with `!`. For
 instance [`findfirst(regex, str)`](@ref) mutates its `regex` argument or
diff --git a/doc/src/manual/performance-tips.md b/doc/src/manual/performance-tips.md
index 8793d11bcadc6..6d5ad5ff83cc2 100644
--- a/doc/src/manual/performance-tips.md
+++ b/doc/src/manual/performance-tips.md
@@ -1188,7 +1188,7 @@ Sometimes you can enable better optimization by promising certain program proper
 
 The common idiom of using 1:n to index into an AbstractArray is not safe if the Array uses unconventional indexing,
 and may cause a segmentation fault if bounds checking is turned off. Use `LinearIndices(x)` or `eachindex(x)`
-instead (see also [offset-arrays](https://docs.julialang.org/en/latest/devdocs/offset-arrays/)).
+instead (see also [Arrays with custom indices](@ref man-custom-indices)).
 
 !!! note
     While `@simd` needs to be placed directly in front of an innermost `for` loop, both `@inbounds` and `@fastmath`
diff --git a/doc/src/manual/style-guide.md b/doc/src/manual/style-guide.md
index e9d21a48f7c94..e2513bde013bf 100644
--- a/doc/src/manual/style-guide.md
+++ b/doc/src/manual/style-guide.md
@@ -86,7 +86,7 @@ One issue here is that if a function inherently requires integers, it might be b
 the caller to decide how non-integers should be converted (e.g. floor or ceiling). Another issue
 is that declaring more specific types leaves more "space" for future method definitions.
 
-## Append `!` to names of functions that modify their arguments
+## [Append `!` to names of functions that modify their arguments](@id bang-convention)
 
 Instead of:
 
diff --git a/src/array.c b/src/array.c
index ffdf2857bf479..3d660dc78594b 100644
--- a/src/array.c
+++ b/src/array.c
@@ -318,7 +318,7 @@ JL_DLLEXPORT jl_array_t *jl_ptr_to_array_1d(jl_value_t *atype, void *data,
     else {
         align = elsz = sizeof(void*);
     }
-    if (((uintptr_t)data) & (align - 1))
+    if (((uintptr_t)data) & ((align > JL_HEAP_ALIGNMENT ? JL_HEAP_ALIGNMENT : align) - 1))
         jl_exceptionf(jl_argumenterror_type,
                       "unsafe_wrap: pointer %p is not properly aligned to %u bytes", data, align);
 
@@ -385,7 +385,7 @@ JL_DLLEXPORT jl_array_t *jl_ptr_to_array(jl_value_t *atype, void *data,
     else {
         align = elsz = sizeof(void*);
     }
-    if (((uintptr_t)data) & (align - 1))
+    if (((uintptr_t)data) & ((align > JL_HEAP_ALIGNMENT ? JL_HEAP_ALIGNMENT : align) - 1))
         jl_exceptionf(jl_argumenterror_type,
                       "unsafe_wrap: pointer %p is not properly aligned to %u bytes", data, align);
 
diff --git a/src/ccall.cpp b/src/ccall.cpp
index 7056eb22cd66f..042ee143b65c5 100644
--- a/src/ccall.cpp
+++ b/src/ccall.cpp
@@ -1,6 +1,7 @@
 // This file is a part of Julia. License is MIT: https://julialang.org/license
 
 // --- the ccall, cglobal, and llvm intrinsics ---
+#include "llvm/Support/Path.h" // for llvm::sys::path
 
 // Map from symbol name (in a certain library) to its GV in sysimg and the
 // DL handle address in the current session.
@@ -68,7 +69,8 @@ static bool runtime_sym_gvs(const char *f_lib, const char *f_name, MT &&M,
     }
     else {
         std::string name = "ccalllib_";
-        name += f_lib;
+        name += llvm::sys::path::filename(f_lib);
+        name += std::to_string(globalUnique++);
         runtime_lib = true;
         auto &libgv = libMapGV[f_lib];
         if (libgv.first == NULL) {
@@ -418,6 +420,7 @@ static Value *llvm_type_rewrite(
         from = emit_static_alloca(ctx, from_type);
         to = emit_bitcast(ctx, from, target_type->getPointerTo());
     }
+    // XXX: deal with possible alignment issues
     ctx.builder.CreateStore(v, from);
     return ctx.builder.CreateLoad(to);
 }
@@ -514,7 +517,7 @@ static Value *julia_to_native(
         tbaa_decorate(jvinfo.tbaa, ctx.builder.CreateStore(emit_unbox(ctx, to, jvinfo, jlto), slot));
     }
     else {
-        emit_memcpy(ctx, slot, jvinfo.tbaa, jvinfo, jl_datatype_size(jlto), jl_datatype_align(jlto));
+        emit_memcpy(ctx, slot, jvinfo.tbaa, jvinfo, jl_datatype_size(jlto), julia_alignment(jlto));
     }
     return slot;
 }
@@ -1392,9 +1395,9 @@ static jl_cgval_t emit_ccall(jl_codectx_t &ctx, jl_value_t **args, size_t nargs)
         if (jl_is_long(argi_root))
             continue;
         jl_cgval_t arg_root = emit_expr(ctx, argi_root);
-        if (arg_root.Vboxed || arg_root.V) {
-            gc_uses.push_back(arg_root.Vboxed ? arg_root.Vboxed : arg_root.V);
-        }
+        Value *gc_root = get_gc_root_for(arg_root);
+        if (gc_root)
+            gc_uses.push_back(gc_root);
     }
 
     jl_unionall_t *unionall = (jl_is_method(ctx.linfo->def.method) && jl_is_unionall(ctx.linfo->def.method->sig))
@@ -1489,8 +1492,9 @@ static jl_cgval_t emit_ccall(jl_codectx_t &ctx, jl_value_t **args, size_t nargs)
         if (!retboxed) {
             return mark_or_box_ccall_result(
                     ctx,
-                    emit_pointer_from_objref(ctx,
-                        emit_bitcast(ctx, ary, T_prjlvalue)),
+                    ctx.builder.CreatePtrToInt(
+                        emit_pointer_from_objref(ctx, emit_bitcast(ctx, ary, T_prjlvalue)),
+                        T_size),
                     retboxed, rt, unionall, static_rt);
         }
         else {
@@ -1498,7 +1502,7 @@ static jl_cgval_t emit_ccall(jl_codectx_t &ctx, jl_value_t **args, size_t nargs)
                     ctx,
                     ctx.builder.CreateAddrSpaceCast(
                         ctx.builder.CreateIntToPtr(ary, T_pjlvalue),
-                        T_prjlvalue), // TODO: this addrspace cast is invalid (implies that the value is rooted elsewhere)
+                        T_prjlvalue), // WARNING: this addrspace cast necessarily implies that the value is rooted elsewhere!
                     retboxed, rt, unionall, static_rt);
         }
     }
@@ -1649,7 +1653,7 @@ static jl_cgval_t emit_ccall(jl_codectx_t &ctx, jl_value_t **args, size_t nargs)
     else if (is_libjulia_func(jl_string_ptr)) {
         assert(lrt == T_size);
         assert(!isVa && !llvmcall && nccallargs == 1);
-        Value *obj = emit_pointer_from_objref(ctx, boxed(ctx, argv[0]));
+        Value *obj = ctx.builder.CreatePtrToInt(emit_pointer_from_objref(ctx, boxed(ctx, argv[0])), T_size);
         Value *strp = ctx.builder.CreateAdd(obj, ConstantInt::get(T_size, sizeof(void*)));
         JL_GC_POP();
         return mark_or_box_ccall_result(ctx, strp, retboxed, rt, unionall, static_rt);
@@ -1665,7 +1669,8 @@ static jl_cgval_t emit_ccall(jl_codectx_t &ctx, jl_value_t **args, size_t nargs)
                 ctx.builder.CreateIntToPtr(destp, T_pint8),
                 1,
                 ctx.builder.CreateIntToPtr(
-                    emit_unbox(ctx, T_size, src, (jl_value_t*)jl_voidpointer_type), T_pint8),
+                    emit_unbox(ctx, T_size, src, (jl_value_t*)jl_voidpointer_type),
+                    T_pint8),
                 0,
                 emit_unbox(ctx, T_size, n, (jl_value_t*)jl_ulong_type),
                 false);
@@ -1800,7 +1805,7 @@ jl_cgval_t function_sig_t::emit_a_ccall(
                                    literal_pointer_val(ctx, (jl_value_t*)rt));
             sretboxed = true;
             gc_uses.push_back(result);
-            argvals[0] = ctx.builder.CreateIntToPtr(emit_pointer_from_objref(ctx, result), fargt_sig.at(0));
+            argvals[0] = ctx.builder.CreateBitCast(emit_pointer_from_objref(ctx, result), fargt_sig.at(0));
         }
     }
 
@@ -1945,7 +1950,7 @@ jl_cgval_t function_sig_t::emit_a_ccall(
                 assert(rtsz > 0);
                 Value *strct = emit_allocobj(ctx, rtsz, runtime_bt);
                 MDNode *tbaa = jl_is_mutable(rt) ? tbaa_mutab : tbaa_immut;
-                int boxalign = jl_datatype_align(rt);
+                int boxalign = julia_alignment(rt);
                 // copy the data from the return value to the new struct
                 const DataLayout &DL = jl_data_layout;
                 auto resultTy = result->getType();
diff --git a/src/cgutils.cpp b/src/cgutils.cpp
index fbeabe667a6de..d5944326d6ee7 100644
--- a/src/cgutils.cpp
+++ b/src/cgutils.cpp
@@ -253,24 +253,34 @@ static DIType *julia_type_to_di(jl_value_t *jt, DIBuilder *dbuilder, bool isboxe
     return (llvm::DIType*)jdt->ditype;
 }
 
-static Value *emit_pointer_from_objref_internal(jl_codectx_t &ctx, Value *V)
+static Value *emit_pointer_from_objref(jl_codectx_t &ctx, Value *V)
 {
+    unsigned AS = cast<PointerType>(V->getType())->getAddressSpace();
+    if (AS != AddressSpace::Tracked && AS != AddressSpace::Derived)
+        return V;
+    V = decay_derived(V);
+    Type *T = PointerType::get(T_jlvalue, AddressSpace::Derived);
+    if (V->getType() != T)
+        V = ctx.builder.CreateBitCast(V, T);
     CallInst *Call = ctx.builder.CreateCall(prepare_call(pointer_from_objref_func), V);
-    Call->addAttribute(AttributeList::FunctionIndex, Attribute::ReadNone);
+    Call->setAttributes(pointer_from_objref_func->getAttributes());
     return Call;
 }
 
-static Value *emit_pointer_from_objref(jl_codectx_t &ctx, Value *V)
+static Value *get_gc_root_for(const jl_cgval_t &x)
 {
-    unsigned AS = cast<PointerType>(V->getType())->getAddressSpace();
-    if (AS != AddressSpace::Tracked && AS != AddressSpace::Derived)
-        return ctx.builder.CreatePtrToInt(V, T_size);
-    V = ctx.builder.CreateBitCast(decay_derived(V),
-            PointerType::get(T_jlvalue, AddressSpace::Derived));
-
-    return ctx.builder.CreatePtrToInt(
-        emit_pointer_from_objref_internal(ctx, V),
-        T_size);
+    if (x.Vboxed)
+        return x.Vboxed;
+    if (x.ispointer() && !x.constant) {
+        assert(x.V);
+        if (PointerType *T = dyn_cast<PointerType>(x.V->getType())) {
+            if (T->getAddressSpace() == AddressSpace::Tracked ||
+                T->getAddressSpace() == AddressSpace::Derived) {
+                return x.V;
+            }
+        }
+    }
+    return nullptr;
 }
 
 // --- emitting pointers directly into code ---
@@ -386,8 +396,8 @@ static unsigned julia_alignment(jl_value_t *jt)
     }
     assert(jl_is_datatype(jt) && ((jl_datatype_t*)jt)->layout);
     unsigned alignment = jl_datatype_align(jt);
-    assert(alignment <= JL_HEAP_ALIGNMENT);
-    assert(JL_HEAP_ALIGNMENT % alignment == 0);
+    if (alignment > JL_HEAP_ALIGNMENT)
+        return JL_HEAP_ALIGNMENT;
     return alignment;
 }
 
@@ -594,7 +604,7 @@ static unsigned jl_field_align(jl_datatype_t *dt, size_t i)
     unsigned al = jl_field_offset(dt, i);
     al |= 16;
     al &= -al;
-    return std::min(al, jl_datatype_align(dt));
+    return std::min({al, (unsigned)jl_datatype_align(dt), (unsigned)JL_HEAP_ALIGNMENT});
 }
 
 static Type *julia_struct_to_llvm(jl_value_t *jt, jl_unionall_t *ua, bool *isboxed, bool llvmcall)
@@ -636,7 +646,6 @@ static Type *julia_struct_to_llvm(jl_value_t *jt, jl_unionall_t *ua, bool *isbox
                 if (jst->layout) {
                     assert(isptr == jl_field_isptr(jst, i));
                     assert((isptr ? sizeof(void*) : fsz + jl_is_uniontype(ty)) == jl_field_size(jst, i));
-                    assert(al <= jl_field_align(jst, i));
                 }
                 Type *lty;
                 if (isptr) {
@@ -647,8 +656,15 @@ static Type *julia_struct_to_llvm(jl_value_t *jt, jl_unionall_t *ua, bool *isbox
                     lty = T_int8;
                 }
                 else if (jl_is_uniontype(ty)) {
-                    // pick an Integer type size such that alignment will be correct
-                    // and always end with an Int8 (selector byte)
+                    // pick an Integer type size such that alignment will generally be correct,
+                    // and always end with an Int8 (selector byte).
+                    // We may need to insert padding first to get to the right offset
+                    if (al > MAX_ALIGN) {
+                        Type *AlignmentType = ArrayType::get(VectorType::get(T_int8, al), 0);
+                        latypes.push_back(AlignmentType);
+                        al = MAX_ALIGN;
+                    }
+                    assert(al <= jl_field_align(jst, i));
                     Type *AlignmentType = IntegerType::get(jl_LLVMContext, 8 * al);
                     unsigned NumATy = fsz / al;
                     unsigned remainder = fsz % al;
@@ -678,8 +694,8 @@ static Type *julia_struct_to_llvm(jl_value_t *jt, jl_unionall_t *ua, bool *isbox
                 assert(jst->layout == NULL); // otherwise should have been caught above
                 decl = T_void;
             }
-            else if (jl_is_vecelement_type(jt)) {
-                // VecElement type is unwrapped in LLVM
+            else if (jl_is_vecelement_type(jt) && !jl_is_uniontype(jl_svecref(ftypes, 0))) {
+                // VecElement type is unwrapped in LLVM (when possible)
                 decl = latypes[0];
             }
             else if (isarray && !type_is_ghost(lasttype)) {
@@ -1212,7 +1228,7 @@ static Value *emit_isconcrete(jl_codectx_t &ctx, Value *typ)
 {
     Value *isconcrete;
     isconcrete = ctx.builder.CreateConstInBoundsGEP1_32(T_int8, emit_bitcast(ctx, decay_derived(typ), T_pint8), offsetof(jl_datatype_t, isconcretetype));
-    isconcrete = ctx.builder.CreateLoad(isconcrete, tbaa_const);
+    isconcrete = ctx.builder.CreateLoad(T_int8, isconcrete, tbaa_const);
     isconcrete = ctx.builder.CreateTrunc(isconcrete, T_int1);
     return isconcrete;
 }
@@ -1336,7 +1352,7 @@ static jl_cgval_t typed_load(jl_codectx_t &ctx, Value *ptr, Value *idx_0based, j
     //}
     //else {
         load = ctx.builder.CreateAlignedLoad(data,
-            isboxed || alignment ?  alignment : julia_alignment(jltype),
+            isboxed || alignment ? alignment : julia_alignment(jltype),
             false);
         if (aliasscope)
             load->setMetadata("alias.scope", aliasscope);
@@ -1898,7 +1914,7 @@ static Value *emit_arrayptr(jl_codectx_t &ctx, const jl_cgval_t &tinfo, bool isb
 static Value *emit_unsafe_arrayptr(jl_codectx_t &ctx, const jl_cgval_t &tinfo, bool isboxed = false)
 {
     Value *t = boxed(ctx, tinfo);
-    t = emit_pointer_from_objref_internal(ctx, decay_derived(t));
+    t = emit_pointer_from_objref(ctx, decay_derived(t));
     return emit_arrayptr_internal(ctx, tinfo, t, 0, isboxed);
 }
 
@@ -2434,7 +2450,8 @@ static Value *boxed(jl_codectx_t &ctx, const jl_cgval_t &vinfo)
 static void emit_unionmove(jl_codectx_t &ctx, Value *dest, MDNode *tbaa_dst, const jl_cgval_t &src, Value *skip, bool isVolatile=false)
 {
     if (AllocaInst *ai = dyn_cast<AllocaInst>(dest))
-        ctx.builder.CreateStore(UndefValue::get(ai->getAllocatedType()), ai);
+        // TODO: make this a lifetime_end & dereferencable annotation?
+        ctx.builder.CreateAlignedStore(UndefValue::get(ai->getAllocatedType()), ai, ai->getAlignment());
     if (jl_is_concrete_type(src.typ) || src.constant) {
         jl_value_t *typ = src.constant ? jl_typeof(src.constant) : src.typ;
         Type *store_ty = julia_type_to_llvm(typ);
@@ -2694,7 +2711,7 @@ static jl_cgval_t emit_new_struct(jl_codectx_t &ctx, jl_value_t *ty, size_t narg
                 if (jl_field_isptr(sty, i)) {
                     fval = boxed(ctx, fval_info);
                     if (!init_as_value)
-                        tbaa_decorate(tbaa_stack, ctx.builder.CreateStore(fval, dest));
+                        tbaa_decorate(tbaa_stack, ctx.builder.CreateAlignedStore(fval, dest, jl_field_align(sty, i)));
                 }
                 else if (jl_is_uniontype(jtype)) {
                     // compute tindex from rhs
@@ -2738,6 +2755,8 @@ static jl_cgval_t emit_new_struct(jl_codectx_t &ctx, jl_value_t *ty, size_t narg
                         }
                         llvm_idx = ptindex;
                         fval = tindex;
+                        if (jl_is_vecelement_type(ty))
+                            fval = ctx.builder.CreateInsertValue(strct, fval, makeArrayRef(llvm_idx));
                     }
                     else {
                         Value *ptindex = emit_struct_gep(ctx, lt, strct, offs + fsz);
diff --git a/src/codegen.cpp b/src/codegen.cpp
index dad73e3f08030..6b0dce9eccbda 100644
--- a/src/codegen.cpp
+++ b/src/codegen.cpp
@@ -296,7 +296,7 @@ static Function *jlsubtype_func;
 static Function *jlapplytype_func;
 static Function *jl_object_id__func;
 static Function *setjmp_func;
-static Function *memcmp_derived_func;
+static Function *memcmp_func;
 static Function *box_int8_func;
 static Function *box_uint8_func;
 static Function *box_int16_func;
@@ -723,7 +723,7 @@ static inline jl_cgval_t mark_julia_type(jl_codectx_t &ctx, Value *v, bool isbox
     if (type_is_ghost(T)) {
         return ghostValue(typ);
     }
-    if (v && !isboxed && v->getType()->isAggregateType() && CountTrackedPointers(v->getType()).count == 0) {
+    if (v && !isboxed && v->getType()->isAggregateType() && !jl_is_vecelement_type(typ) && CountTrackedPointers(v->getType()).count == 0) {
         // eagerly put this back onto the stack
         // llvm mem2reg pass will remove this if unneeded
         return value_to_pointer(ctx, v, typ, NULL);
@@ -1685,7 +1685,7 @@ void *jl_get_llvmf_decl(jl_method_instance_t *mi, size_t world, bool getwrapper,
         // internal error
         return NULL;
 
-    const jl_llvm_functions_t &decls = codeinst->functionObjectsDecls;
+    jl_llvm_functions_t decls = codeinst->functionObjectsDecls;
     if (decls.functionObject == NULL && codeinst->invoke == jl_fptr_const_return && jl_is_method(mi->def.method)) {
         // normally we don't generate native code for these functions, so need an exception here
         // This leaks a bit of memory to cache native code that we'll never actually need
@@ -1699,6 +1699,7 @@ void *jl_get_llvmf_decl(jl_method_instance_t *mi, size_t world, bool getwrapper,
             if (codeinst == NULL)
                 // internal error
                 return NULL;
+            decls = codeinst->functionObjectsDecls;
         }
         JL_UNLOCK(&codegen_lock);
     }
@@ -2373,13 +2374,24 @@ static Value *emit_bits_compare(jl_codectx_t &ctx, jl_cgval_t arg1, jl_cgval_t a
         Value *varg1 = arg1.ispointer() ? maybe_decay_tracked(data_pointer(ctx, arg1)) : arg1.V;
         Value *varg2 = arg2.ispointer() ? maybe_decay_tracked(data_pointer(ctx, arg2)) : arg2.V;
         if (sz > 512 && !sty->layout->haspadding) {
-            varg1 = decay_derived(arg1.ispointer() ? varg1 : value_to_pointer(ctx, arg1).V);
-            varg2 = decay_derived(arg2.ispointer() ? varg2 : value_to_pointer(ctx, arg2).V);
-            Value *answer = ctx.builder.CreateCall(prepare_call(memcmp_derived_func), {
-                        maybe_bitcast(ctx, varg1, T_pint8),
-                        maybe_bitcast(ctx, varg2, T_pint8),
-                        ConstantInt::get(T_size, sz)
-                    });
+            if (!arg1.ispointer())
+                varg1 = value_to_pointer(ctx, arg1).V;
+            if (!arg2.ispointer())
+                varg2 = value_to_pointer(ctx, arg2).V;
+            varg1 = emit_pointer_from_objref(ctx, varg1);
+            varg2 = emit_pointer_from_objref(ctx, varg2);
+            Value *gc_uses[2];
+            int nroots = 0;
+            if ((gc_uses[nroots] = get_gc_root_for(arg1)))
+                nroots++;
+            if ((gc_uses[nroots] = get_gc_root_for(arg2)))
+                nroots++;
+            OperandBundleDef OpBundle("jl_roots", gc_uses);
+            Value *answer = ctx.builder.CreateCall(prepare_call(memcmp_func), {
+                        ctx.builder.CreateBitCast(varg1, T_pint8),
+                        ctx.builder.CreateBitCast(varg2, T_pint8),
+                        ConstantInt::get(T_size, sz) },
+                    ArrayRef<OperandBundleDef>(&OpBundle, nroots ? 1 : 0));
             return ctx.builder.CreateICmpEQ(answer, ConstantInt::get(T_int32, 0));
         }
         else {
@@ -2590,7 +2602,7 @@ static bool emit_builtin_call(jl_codectx_t &ctx, jl_cgval_t *ret, jl_value_t *f,
 #ifdef _P64
                 nva = ctx.builder.CreateTrunc(nva, T_int32);
 #endif
-                Value *theArgs = ctx.builder.CreateInBoundsGEP(ctx.argArray, ConstantInt::get(T_size, ctx.nReqArgs));
+                Value *theArgs = ctx.builder.CreateInBoundsGEP(T_prjlvalue, ctx.argArray, ConstantInt::get(T_size, ctx.nReqArgs));
                 Value *r = ctx.builder.CreateCall(prepare_call(jlapplygeneric_func), { theF, theArgs, nva });
                 *ret = mark_julia_type(ctx, r, true, jl_any_type);
                 return true;
@@ -2846,13 +2858,13 @@ static bool emit_builtin_call(jl_codectx_t &ctx, jl_cgval_t *ret, jl_value_t *f,
                     if (load->getPointerOperand() == ctx.slots[ctx.vaSlot].boxroot && ctx.argArray) {
                         Value *valen = emit_n_varargs(ctx);
                         jl_cgval_t va_ary( // fake instantiation of a cgval, in order to call emit_bounds_check
-                                ctx.builder.CreateInBoundsGEP(ctx.argArray, ConstantInt::get(T_size, ctx.nReqArgs)),
+                                ctx.builder.CreateInBoundsGEP(T_prjlvalue, ctx.argArray, ConstantInt::get(T_size, ctx.nReqArgs)),
                                 NULL, false, NULL, NULL);
                         Value *idx = emit_unbox(ctx, T_size, fld, (jl_value_t*)jl_long_type);
                         jl_value_t *boundscheck = (nargs == 3 ? argv[3].constant : jl_true);
                         idx = emit_bounds_check(ctx, va_ary, NULL, idx, valen, boundscheck);
                         idx = ctx.builder.CreateAdd(idx, ConstantInt::get(T_size, ctx.nReqArgs));
-                        Instruction *v = ctx.builder.CreateLoad(ctx.builder.CreateInBoundsGEP(ctx.argArray, idx));
+                        Instruction *v = ctx.builder.CreateLoad(T_prjlvalue, ctx.builder.CreateInBoundsGEP(ctx.argArray, idx));
                         // if we know the result type of this load, we will mark that information here too
                         tbaa_decorate(tbaa_value, maybe_mark_load_dereferenceable(v, false, rt));
                         *ret = mark_julia_type(ctx, v, /*boxed*/ true, rt);
@@ -2994,8 +3006,8 @@ static bool emit_builtin_call(jl_codectx_t &ctx, jl_cgval_t *ret, jl_value_t *f,
                 Value *idx = emit_unbox(ctx, T_size, fld, (jl_value_t*)jl_long_type);
                 jl_value_t *boundscheck = (nargs == 3 ? argv[3].constant : jl_true);
                 emit_bounds_check(ctx, typ, (jl_value_t*)jl_datatype_type, idx, types_len, boundscheck);
-                Value *fieldtyp_p = ctx.builder.CreateInBoundsGEP(decay_derived(emit_bitcast(ctx, types_svec, T_pprjlvalue)), idx);
-                Value *fieldtyp = tbaa_decorate(tbaa_const, ctx.builder.CreateLoad(fieldtyp_p));
+                Value *fieldtyp_p = ctx.builder.CreateInBoundsGEP(T_prjlvalue, decay_derived(emit_bitcast(ctx, types_svec, T_pprjlvalue)), idx);
+                Value *fieldtyp = tbaa_decorate(tbaa_const, ctx.builder.CreateLoad(T_prjlvalue, fieldtyp_p));
                 *ret = mark_julia_type(ctx, fieldtyp, true, (jl_value_t*)jl_type_type);
                 return true;
             }
@@ -3009,7 +3021,7 @@ static bool emit_builtin_call(jl_codectx_t &ctx, jl_cgval_t *ret, jl_value_t *f,
         if (sty == jl_string_type || sty == jl_simplevector_type) {
             // String and SimpleVector's length fields have the same layout
             auto ptr = emit_bitcast(ctx, boxed(ctx, obj), T_psize);
-            Value *len = tbaa_decorate(tbaa_mutab, ctx.builder.CreateLoad(ptr));
+            Value *len = tbaa_decorate(tbaa_mutab, ctx.builder.CreateLoad(T_size, ptr));
             if (sty == jl_simplevector_type) {
                 len = ctx.builder.CreateMul(len, ConstantInt::get(T_size, sizeof(void*)));
                 len = ctx.builder.CreateAdd(len, ConstantInt::get(T_size, sizeof(void*)));
@@ -3424,7 +3436,7 @@ static Value *global_binding_pointer(jl_codectx_t &ctx, jl_module_t *m, jl_sym_t
             GlobalVariable *bindinggv = new GlobalVariable(*ctx.f->getParent(), T_pjlvalue,
                     false, GlobalVariable::InternalLinkage,
                     initnul, name.str());
-            Value *cachedval = ctx.builder.CreateLoad(bindinggv);
+            Value *cachedval = ctx.builder.CreateLoad(T_pjlvalue, bindinggv);
             BasicBlock *have_val = BasicBlock::Create(jl_LLVMContext, "found"),
                 *not_found = BasicBlock::Create(jl_LLVMContext, "notfound");
             BasicBlock *currentbb = ctx.builder.GetInsertBlock();
@@ -3476,7 +3488,7 @@ static jl_cgval_t emit_sparam(jl_codectx_t &ctx, size_t i)
             T_prjlvalue,
             ctx.spvals_ptr,
             i + sizeof(jl_svec_t) / sizeof(jl_value_t*));
-    Value *sp = tbaa_decorate(tbaa_const, ctx.builder.CreateLoad(bp));
+    Value *sp = tbaa_decorate(tbaa_const, ctx.builder.CreateLoad(T_prjlvalue, bp));
     Value *isnull = ctx.builder.CreateICmpNE(emit_typeof(ctx, sp),
             maybe_decay_untracked(literal_pointer_val(ctx, (jl_value_t*)jl_tvar_type)));
     jl_unionall_t *sparam = (jl_unionall_t*)ctx.linfo->def.method->sig;
@@ -3499,7 +3511,7 @@ static jl_cgval_t emit_global(jl_codectx_t &ctx, jl_sym_t *sym)
         // double-check that a global variable is actually defined. this
         // can be a problem in parallel when a definition is missing on
         // one machine.
-        return mark_julia_type(ctx, tbaa_decorate(tbaa_binding, ctx.builder.CreateLoad(bp)), true, jl_any_type);
+        return mark_julia_type(ctx, tbaa_decorate(tbaa_binding, ctx.builder.CreateLoad(T_prjlvalue, bp)), true, jl_any_type);
     }
     return emit_checked_var(ctx, bp, sym, false, tbaa_binding);
 }
@@ -3514,15 +3526,15 @@ static jl_cgval_t emit_isdefined(jl_codectx_t &ctx, jl_value_t *sym)
             return mark_julia_const(jl_true);
         if (vi.boxroot == NULL || vi.pTIndex != NULL) {
             assert(vi.defFlag);
-            isnull = ctx.builder.CreateLoad(vi.defFlag, vi.isVolatile);
+            isnull = ctx.builder.CreateLoad(T_int1, vi.defFlag, vi.isVolatile);
         }
         if (vi.boxroot != NULL) {
-            Value *boxed = ctx.builder.CreateLoad(vi.boxroot, vi.isVolatile);
+            Value *boxed = ctx.builder.CreateLoad(T_prjlvalue, vi.boxroot, vi.isVolatile);
             Value *box_isnull = ctx.builder.CreateICmpNE(boxed, maybe_decay_untracked(V_null));
             if (vi.pTIndex) {
                 // value is either boxed in the stack slot, or unboxed in value
                 // as indicated by testing (pTIndex & 0x80)
-                Value *tindex = ctx.builder.CreateLoad(vi.pTIndex, vi.isVolatile);
+                Value *tindex = ctx.builder.CreateLoad(T_int8, vi.pTIndex, vi.isVolatile);
                 Value *load_unbox = ctx.builder.CreateICmpEQ(
                             ctx.builder.CreateAnd(tindex, ConstantInt::get(T_int8, 0x80)),
                             ConstantInt::get(T_int8, 0));
@@ -3547,7 +3559,7 @@ static jl_cgval_t emit_isdefined(jl_codectx_t &ctx, jl_value_t *sym)
                 T_prjlvalue,
                 ctx.spvals_ptr,
                 i + sizeof(jl_svec_t) / sizeof(jl_value_t*));
-        Value *sp = tbaa_decorate(tbaa_const, ctx.builder.CreateLoad(bp));
+        Value *sp = tbaa_decorate(tbaa_const, ctx.builder.CreateLoad(T_prjlvalue, bp));
         isnull = ctx.builder.CreateICmpNE(emit_typeof(ctx, sp),
             maybe_decay_untracked(literal_pointer_val(ctx, (jl_value_t*)jl_tvar_type)));
     }
@@ -3601,8 +3613,8 @@ static jl_cgval_t emit_varinfo(jl_codectx_t &ctx, jl_varinfo_t &vi, jl_sym_t *va
             AllocaInst *ssaslot = cast<AllocaInst>(varslot->clone());
             ssaslot->insertAfter(varslot);
             if (vi.isVolatile) {
-                Value *unbox = ctx.builder.CreateLoad(vi.value.V, true);
-                ctx.builder.CreateStore(unbox, ssaslot);
+                Value *unbox = ctx.builder.CreateAlignedLoad(ssaslot->getAllocatedType(), varslot, varslot->getAlignment(), true);
+                ctx.builder.CreateAlignedStore(unbox, ssaslot, ssaslot->getAlignment());
             }
             else {
                 const DataLayout &DL = jl_data_layout;
@@ -3611,18 +3623,18 @@ static jl_cgval_t emit_varinfo(jl_codectx_t &ctx, jl_varinfo_t &vi, jl_sym_t *va
             }
             Value *tindex = NULL;
             if (vi.pTIndex)
-                tindex = ctx.builder.CreateLoad(vi.pTIndex, vi.isVolatile);
+                tindex = ctx.builder.CreateLoad(T_int8, vi.pTIndex, vi.isVolatile);
             v = mark_julia_slot(ssaslot, vi.value.typ, tindex, tbaa_stack);
         }
         if (vi.boxroot == NULL)
             v = update_julia_type(ctx, v, typ);
         if (vi.usedUndef) {
             assert(vi.defFlag);
-            isnull = ctx.builder.CreateLoad(vi.defFlag, vi.isVolatile);
+            isnull = ctx.builder.CreateLoad(T_int1, vi.defFlag, vi.isVolatile);
         }
     }
     if (vi.boxroot != NULL) {
-        Instruction *boxed = ctx.builder.CreateLoad(vi.boxroot, vi.isVolatile);
+        Instruction *boxed = ctx.builder.CreateLoad(T_prjlvalue, vi.boxroot, vi.isVolatile);
         Value *box_isnull;
         if (vi.usedUndef)
             box_isnull = ctx.builder.CreateICmpNE(boxed, maybe_decay_untracked(V_null));
@@ -3714,7 +3726,7 @@ static void emit_vi_assignment_unboxed(jl_codectx_t &ctx, jl_varinfo_t &vi, Valu
                 if (vi.value.V != rval_info.V) {
                     Value *copy_bytes = ConstantInt::get(T_int32, jl_datatype_size(vi.value.typ));
                     emit_memcpy(ctx, vi.value.V, tbaa_stack, rval_info, copy_bytes,
-                                jl_datatype_align(rval_info.typ), vi.isVolatile);
+                                julia_alignment(rval_info.typ), vi.isVolatile);
                 }
             }
             else {
@@ -3803,12 +3815,12 @@ static void emit_phinode_assign(jl_codectx_t &ctx, ssize_t idx, jl_value_t *r)
         dest = emit_static_alloca(ctx, vtype);
         Value *phi = emit_static_alloca(ctx, vtype);
 #if JL_LLVM_VERSION >= 70000
-        ctx.builder.CreateMemCpy(phi, jl_datatype_align(phiType),
+        ctx.builder.CreateMemCpy(phi, julia_alignment(phiType),
              dest, 0,
              jl_datatype_size(phiType), false);
 #else
         ctx.builder.CreateMemCpy(phi, dest, jl_datatype_size(phiType),
-             jl_datatype_align(phiType), false);
+             julia_alignment(phiType), false);
 #endif
         ctx.builder.CreateLifetimeEnd(dest);
         slot = mark_julia_slot(phi, phiType, NULL, tbaa_stack);
@@ -4663,7 +4675,7 @@ static Function* gen_cfun_wrapper(
         if (aref) {
             if (jargty == (jl_value_t*)jl_any_type) {
                 inputarg = mark_julia_type(ctx,
-                        ctx.builder.CreateLoad(emit_bitcast(ctx, val, T_pprjlvalue)),
+                        ctx.builder.CreateLoad(T_prjlvalue, emit_bitcast(ctx, val, T_pprjlvalue)),
                         true, jl_any_type);
             }
             else if (static_at && jl_is_concrete_immutable(jargty)) { // anything that could be stored unboxed
@@ -5325,7 +5337,7 @@ static Function *gen_invoke_wrapper(jl_method_instance_t *lam, jl_value_t *jlret
         }
         else {
             Value *argPtr = ctx.builder.CreateConstInBoundsGEP1_32(T_prjlvalue, argArray, i - 1);
-            theArg = maybe_mark_load_dereferenceable(ctx.builder.CreateLoad(argPtr), false, ty);
+            theArg = maybe_mark_load_dereferenceable(ctx.builder.CreateLoad(T_prjlvalue, argPtr), false, ty);
         }
         if (!isboxed) {
             theArg = decay_derived(emit_bitcast(ctx, theArg, PointerType::get(lty, 0)));
@@ -5345,7 +5357,7 @@ static Function *gen_invoke_wrapper(jl_method_instance_t *lam, jl_value_t *jlret
         if (retarg == 0)
             theArg = funcArg;
         else
-            theArg = ctx.builder.CreateLoad(ctx.builder.CreateConstInBoundsGEP1_32(T_prjlvalue, argArray, retarg - 1));
+            theArg = ctx.builder.CreateLoad(T_prjlvalue, ctx.builder.CreateConstInBoundsGEP1_32(T_prjlvalue, argArray, retarg - 1));
         retval = mark_julia_type(ctx, theArg, true, jl_any_type);
     }
     else {
@@ -6120,8 +6132,8 @@ static std::unique_ptr<Module> emit_function(
                     theArg = mark_julia_type(ctx, fArg, true, vi.value.typ);
                 }
                 else {
-                    Value *argPtr = ctx.builder.CreateInBoundsGEP(argArray, ConstantInt::get(T_size, i-1));
-                    auto load = maybe_mark_load_dereferenceable(ctx.builder.CreateLoad(argPtr),
+                    Value *argPtr = ctx.builder.CreateInBoundsGEP(T_prjlvalue, argArray, ConstantInt::get(T_size, i-1));
+                    auto load = maybe_mark_load_dereferenceable(ctx.builder.CreateLoad(T_prjlvalue, argPtr),
                                                                 false, vi.value.typ);
                     theArg = mark_julia_type(ctx, load, true, vi.value.typ);
                     if (ctx.debug_enabled && vi.dinfo && !vi.boxroot && !vi.value.V) {
@@ -6198,7 +6210,7 @@ static std::unique_ptr<Module> emit_function(
             restTuple =
                 ctx.builder.CreateCall(prepare_call(jltuple_func),
                         { maybe_decay_untracked(V_null),
-                          ctx.builder.CreateInBoundsGEP(argArray,
+                          ctx.builder.CreateInBoundsGEP(T_prjlvalue, argArray,
                                   ConstantInt::get(T_size, nreq - 1)),
                           ctx.builder.CreateSub(argCount,
                                   ConstantInt::get(T_int32, nreq - 1)) });
@@ -6563,16 +6575,17 @@ static std::unique_ptr<Module> emit_function(
                     }
                 }
                 else {
-                    Type *store_ty = julia_type_to_llvm(retvalinfo.typ);
+                    Type *store_ty = retvalinfo.V->getType();
                     Type *dest_ty = store_ty->getPointerTo();
-                    Value *Val = emit_unbox(ctx, store_ty, retvalinfo, retvalinfo.typ);
+                    Value *Val = retvalinfo.V;
                     if (returninfo.return_roots) {
-                        assert(store_ty == Val->getType());
+                        assert(julia_type_to_llvm(retvalinfo.typ) == store_ty);
                         emit_sret_roots(ctx, false, Val, store_ty, f->arg_begin() + 1, returninfo.return_roots);
                     }
                     if (dest_ty != sret->getType())
                         sret = emit_bitcast(ctx, sret, dest_ty);
-                    ctx.builder.CreateStore(Val, sret);
+                    ctx.builder.CreateAlignedStore(Val, sret, julia_alignment(retvalinfo.typ));
+                    assert(retvalinfo.TIndex == NULL && "unreachable"); // unimplemented representation
                 }
             }
 
@@ -7334,16 +7347,17 @@ static void init_julia_llvm_env(Module *m)
     add_named_global(setjmp_func, &jl_setjmp_f);
 
     std::vector<Type*> args_memcmp(0);
-    args_memcmp.push_back(T_pint8_derived);
-    args_memcmp.push_back(T_pint8_derived);
+    args_memcmp.push_back(T_pint8);
+    args_memcmp.push_back(T_pint8);
     args_memcmp.push_back(T_size);
-    memcmp_derived_func =
+    memcmp_func =
         Function::Create(FunctionType::get(T_int32, args_memcmp, false),
                          Function::ExternalLinkage, "memcmp", m);
-    memcmp_derived_func->addFnAttr(Attribute::ReadOnly);
-    memcmp_derived_func->addFnAttr(Attribute::NoUnwind);
-    memcmp_derived_func->addFnAttr(Attribute::ArgMemOnly);
-    add_named_global(memcmp_derived_func, &memcmp);
+    memcmp_func->addFnAttr(Attribute::ReadOnly);
+    memcmp_func->addFnAttr(Attribute::NoUnwind);
+    memcmp_func->addFnAttr(Attribute::ArgMemOnly);
+    add_named_global(memcmp_func, &memcmp);
+    // TODO: inferLibFuncAttributes(*memcmp_func, TLI);
 
     std::vector<Type*> te_args(0);
     te_args.push_back(T_pint8);
diff --git a/src/datatype.c b/src/datatype.c
index 57f2111127bfa..779d0a30c98af 100644
--- a/src/datatype.c
+++ b/src/datatype.c
@@ -105,6 +105,8 @@ static jl_datatype_layout_t *jl_get_layout(uint32_t nfields,
                                            jl_fielddesc32_t desc[],
                                            uint32_t pointers[]) JL_NOTSAFEPOINT
 {
+    assert(alignment); // should have been verified by caller
+
     // compute the smallest fielddesc type that can hold the layout description
     int fielddesc_type = 0;
     if (nfields > 0) {
@@ -191,19 +193,7 @@ unsigned jl_special_vector_alignment(size_t nfields, jl_value_t *t)
 {
     if (!jl_is_vecelement_type(t))
         return 0;
-    // LLVM 3.7 and 3.8 either crash or generate wrong code for many
-    // SIMD vector sizes N. It seems the rule is that N can have at
-    // most 2 non-zero bits. (This is true at least for N<=100.) See
-    // also <https://llvm.org/bugs/show_bug.cgi?id=27708>.
-    size_t mask = nfields;
-    // See e.g.
-    // <https://graphics.stanford.edu/%7Eseander/bithacks.html> for an
-    // explanation of this bit-counting algorithm.
-    mask &= mask-1;             // clear least-significant 1 if present
-    mask &= mask-1;             // clear another 1
-    if (mask)
-        return 0;               // nfields has more than two 1s
-    assert(jl_datatype_nfields(t)==1);
+    assert(jl_datatype_nfields(t) == 1);
     jl_value_t *ty = jl_field_type((jl_datatype_t*)t, 0);
     if (!jl_is_primitivetype(ty))
         // LLVM requires that a vector element be a primitive type.
@@ -211,16 +201,12 @@ unsigned jl_special_vector_alignment(size_t nfields, jl_value_t *t)
         // motivating use case comes up for Julia, we reject pointers.
         return 0;
     size_t elsz = jl_datatype_size(ty);
-    if (elsz>8 || (1<<elsz & 0x116) == 0)
-        // Element size is not 1, 2, 4, or 8.
+    if (elsz != 1 && elsz != 2 && elsz != 4 && elsz != 8)
+        // Only handle power-of-two-sized elements (for now)
         return 0;
-    size_t size = nfields*elsz;
-    // LLVM's alignment rule for vectors seems to be to round up to
-    // a power of two, even if that's overkill for the target hardware.
-    size_t alignment=1;
-    for( ; size>alignment; alignment*=2 )
-        continue;
-    return alignment;
+    size_t size = nfields * elsz;
+    // Use natural alignment for this vector: this matches LLVM and clang.
+    return next_power_of_two(size);
 }
 
 STATIC_INLINE int jl_is_datatype_make_singleton(jl_datatype_t *d)
@@ -464,7 +450,6 @@ void jl_compute_field_offsets(jl_datatype_t *st)
                     haspadding = 1;
                 }
             }
-            assert(al <= JL_HEAP_ALIGNMENT && (JL_HEAP_ALIGNMENT % al) == 0);
             if (al != 0) {
                 size_t alsz = LLT_ALIGN(sz, al);
                 if (sz & (al - 1))
@@ -484,10 +469,7 @@ void jl_compute_field_offsets(jl_datatype_t *st)
             // Some tuples become LLVM vectors with stronger alignment than what was calculated above.
             unsigned al = jl_special_vector_alignment(nfields, firstty);
             assert(al % alignm == 0);
-            // JL_HEAP_ALIGNMENT is the biggest alignment we can guarantee on the heap.
-            if (al > JL_HEAP_ALIGNMENT)
-                alignm = JL_HEAP_ALIGNMENT;
-            else if (al)
+            if (al > alignm)
                 alignm = al;
         }
         st->size = LLT_ALIGN(sz, alignm);
diff --git a/src/gc.h b/src/gc.h
index 270f1101debee..ee460df679c12 100644
--- a/src/gc.h
+++ b/src/gc.h
@@ -374,7 +374,7 @@ STATIC_INLINE unsigned ffs_u32(uint32_t bitvec)
     _BitScanForward(&j, bitvec);
     return j;
 #else
-    return ffs(bitvec) - 1;
+    return __builtin_ffs(bitvec) - 1;
 #endif
 }
 #endif
diff --git a/src/intrinsics.cpp b/src/intrinsics.cpp
index 90a2ff695ae77..deeca508061c6 100644
--- a/src/intrinsics.cpp
+++ b/src/intrinsics.cpp
@@ -156,25 +156,25 @@ static Constant *julia_const_to_llvm(const void *ptr, jl_datatype_t *bt)
     if (bt == jl_bool_type)
         return ConstantInt::get(T_int8, (*(const uint8_t*)ptr) ? 1 : 0);
 
-    if (jl_is_vecelement_type((jl_value_t*)bt))
-        bt = (jl_datatype_t*)jl_tparam0(bt);
-
     Type *lt = julia_struct_to_llvm((jl_value_t*)bt, NULL, NULL);
 
+    if (jl_is_vecelement_type((jl_value_t*)bt) && !jl_is_uniontype(jl_tparam0(bt)))
+        bt = (jl_datatype_t*)jl_tparam0(bt);
+
     if (type_is_ghost(lt))
         return UndefValue::get(lt);
 
-    if (jl_is_primitivetype(bt)) {
-        if (lt->isFloatTy()) {
-            uint32_t data32 = *(const uint32_t*)ptr;
-            return ConstantFP::get(jl_LLVMContext,
-                    APFloat(lt->getFltSemantics(), APInt(32, data32)));
-        }
-        if (lt->isDoubleTy()) {
-            uint64_t data64 = *(const uint64_t*)ptr;
-            return ConstantFP::get(jl_LLVMContext,
-                    APFloat(lt->getFltSemantics(), APInt(64, data64)));
-        }
+    if (lt->isFloatTy()) {
+        uint32_t data32 = *(const uint32_t*)ptr;
+        return ConstantFP::get(jl_LLVMContext,
+                APFloat(lt->getFltSemantics(), APInt(32, data32)));
+    }
+    if (lt->isDoubleTy()) {
+        uint64_t data64 = *(const uint64_t*)ptr;
+        return ConstantFP::get(jl_LLVMContext,
+                APFloat(lt->getFltSemantics(), APInt(64, data64)));
+    }
+    if (lt->isFloatingPointTy() || lt->isIntegerTy()) {
         int nb = jl_datatype_size(bt);
         APInt val(8 * nb, 0);
         void *bits = const_cast<uint64_t*>(val.getRawData());
@@ -335,13 +335,13 @@ static Value *emit_unbox(jl_codectx_t &ctx, Type *to, const jl_cgval_t &x, jl_va
 
     Constant *c = x.constant ? julia_const_to_llvm(x.constant) : NULL;
     if (!x.ispointer() || c) { // already unboxed, but sometimes need conversion
-        Value *unboxed = emit_unboxed_coercion(ctx, to, c ? c : x.V);
+        Value *unboxed = c ? c : x.V;
         if (!dest)
-            return unboxed;
+            return emit_unboxed_coercion(ctx, to, unboxed);
         Type *dest_ty = unboxed->getType()->getPointerTo();
         if (dest->getType() != dest_ty)
             dest = emit_bitcast(ctx, dest, dest_ty);
-        tbaa_decorate(tbaa_dest, ctx.builder.CreateStore(unboxed, dest));
+        tbaa_decorate(tbaa_dest, ctx.builder.CreateAlignedStore(unboxed, dest, julia_alignment(jt)));
         return NULL;
     }
 
@@ -654,7 +654,7 @@ static jl_cgval_t emit_pointerset(jl_codectx_t &ctx, jl_cgval_t *argv)
         // unsafe_store to Ptr{Any} is allowed to implicitly drop GC roots.
         thePtr = emit_unbox(ctx, T_psize, e, e.typ);
         Instruction *store = ctx.builder.CreateAlignedStore(
-          emit_pointer_from_objref(ctx, boxed(ctx, x)),
+          ctx.builder.CreatePtrToInt(emit_pointer_from_objref(ctx, boxed(ctx, x)), T_size),
             ctx.builder.CreateGEP(T_size, thePtr, im1), align_nb);
         tbaa_decorate(tbaa_data, store);
     }
diff --git a/src/julia.h b/src/julia.h
index 647ee82be932f..e4e6403945b95 100644
--- a/src/julia.h
+++ b/src/julia.h
@@ -428,9 +428,9 @@ typedef struct {
     uint32_t nfields;
     uint32_t npointers; // number of pointers embedded inside
     int32_t first_ptr; // index of the first pointer (or -1)
-    uint32_t alignment : 9; // strictest alignment over all fields
-    uint32_t haspadding : 1; // has internal undefined bytes
-    uint32_t fielddesc_type : 2; // 0 -> 8, 1 -> 16, 2 -> 32
+    uint16_t alignment; // strictest alignment over all fields
+    uint16_t haspadding : 1; // has internal undefined bytes
+    uint16_t fielddesc_type : 2; // 0 -> 8, 1 -> 16, 2 -> 32
     // union {
     //     jl_fielddesc8_t field8[nfields];
     //     jl_fielddesc16_t field16[nfields];
diff --git a/src/llvm-alloc-opt.cpp b/src/llvm-alloc-opt.cpp
index fd45665791389..46cbb3c64f41f 100644
--- a/src/llvm-alloc-opt.cpp
+++ b/src/llvm-alloc-opt.cpp
@@ -938,8 +938,8 @@ void Optimizer::moveToStack(CallInst *orig_inst, size_t sz, bool has_ref)
     // SSA from it are live when we run the allocation again.
     // It is now safe to promote the allocation to an entry block alloca.
     size_t align = 1;
-    // TODO make codegen handling of alignment consistent and pass that as a parameter
-    // to the allocation function directly.
+    // TODO: This is overly conservative. May want to instead pass this as a
+    //       parameter to the allocation function directly.
     if (sz > 1)
         align = MinAlign(JL_SMALL_BYTE_ALIGNMENT, NextPowerOf2(sz));
     // No debug info for prolog instructions
diff --git a/src/llvm-late-gc-lowering.cpp b/src/llvm-late-gc-lowering.cpp
index e2a48171c27a0..90138a45b703f 100644
--- a/src/llvm-late-gc-lowering.cpp
+++ b/src/llvm-late-gc-lowering.cpp
@@ -477,15 +477,15 @@ static std::pair<Value*,int> FindBaseValue(const State &S, Value *V, bool UseCac
             CurrentV = EEI->getVectorOperand();
         }
         else if (auto LI = dyn_cast<LoadInst>(CurrentV)) {
-            if (auto PtrT = dyn_cast<PointerType>(LI->getType())) {
+            if (auto PtrT = dyn_cast<PointerType>(LI->getType()->getScalarType())) {
                 if (PtrT->getAddressSpace() == AddressSpace::Loaded) {
                     CurrentV = LI->getPointerOperand();
+                    fld_idx = -1;
                     if (!isSpecialPtr(CurrentV->getType())) {
-                        // Special case to bypass the check below.
                         // This could really be anything, but it's not loaded
                         // from a tracked pointer, so it doesn't matter what
-                        // it is.
-                        return std::make_pair(CurrentV, fld_idx);
+                        // it is--just pick something simple.
+                        CurrentV = ConstantPointerNull::get(Type::getInt8PtrTy(V->getContext()));
                     }
                     continue;
                 }
@@ -493,6 +493,34 @@ static std::pair<Value*,int> FindBaseValue(const State &S, Value *V, bool UseCac
             // In general a load terminates a walk
             break;
         }
+        else if (auto II = dyn_cast<IntrinsicInst>(CurrentV)) {
+            // Some intrinsics behave like LoadInst followed by a SelectInst
+            // This should never happen in a derived addrspace (since those cannot be stored to memory)
+            // so we don't need to lift these operations, but we do need to check if it's loaded and continue walking the base pointer
+            if (II->getIntrinsicID() == Intrinsic::masked_load ||
+                II->getIntrinsicID() == Intrinsic::masked_gather) {
+                if (auto PtrT = dyn_cast<PointerType>(II->getType()->getVectorElementType())) {
+                    if (PtrT->getAddressSpace() == AddressSpace::Loaded) {
+                        assert(isa<UndefValue>(II->getOperand(3)) && "unimplemented");
+                        CurrentV = II->getOperand(0);
+                        if (II->getIntrinsicID() == Intrinsic::masked_load) {
+                            fld_idx = -1;
+                            if (!isSpecialPtr(CurrentV->getType())) {
+                                CurrentV = ConstantPointerNull::get(Type::getInt8PtrTy(V->getContext()));
+                            }
+                        } else {
+                            if (!isSpecialPtr(CurrentV->getType()->getVectorElementType())) {
+                                CurrentV = ConstantPointerNull::get(Type::getInt8PtrTy(V->getContext()));
+                                fld_idx = -1;
+                            }
+                        }
+                        continue;
+                    }
+                }
+                // In general a load terminates a walk
+                break;
+            }
+        }
         else {
             break;
         }
@@ -1299,6 +1327,23 @@ State LateLowerGCFrame::LocalScan(Function &F) {
                         II->getIntrinsicID() == Intrinsic::lifetime_end) {
                         continue;
                     }
+                    if (II->getIntrinsicID() == Intrinsic::masked_load ||
+                        II->getIntrinsicID() == Intrinsic::masked_gather) {
+                        if (auto PtrT = dyn_cast<PointerType>(II->getType()->getVectorElementType())) {
+                            if (isSpecialPtr(PtrT)) {
+                                // LLVM sometimes tries to materialize these operations with undefined pointers in our non-integral address space.
+                                // Hopefully LLVM didn't already propagate that information and poison our users. Set those to NULL now.
+                                Value *passthru = II->getArgOperand(3);
+                                if (isa<UndefValue>(passthru)) {
+                                    II->setArgOperand(3, Constant::getNullValue(passthru->getType()));
+                                }
+                                if (PtrT->getAddressSpace() == AddressSpace::Loaded) {
+                                    // These are not real defs
+                                    continue;
+                                }
+                            }
+                        }
+                    }
                 }
                 auto callee = CI->getCalledFunction();
                 if (callee && callee == typeof_func) {
@@ -1379,10 +1424,11 @@ State LateLowerGCFrame::LocalScan(Function &F) {
                 // of this object to uses of the object we're loading
                 // from.
                 SmallVector<int, 1> RefinedPtr{};
+                Type *Ty = LI->getType()->getScalarType();
                 if (isLoadFromImmut(LI) && isSpecialPtr(LI->getPointerOperand()->getType())) {
                     RefinedPtr.push_back(Number(S, LI->getPointerOperand()));
                 } else if (LI->getType()->isPointerTy() &&
-                        isSpecialPtr(LI->getType()) &&
+                        isSpecialPtr(Ty) &&
                         LooksLikeFrameRef(LI->getPointerOperand())) {
                     // Loads from a jlcall argument array
                     RefinedPtr.push_back(-1);
@@ -1392,8 +1438,7 @@ State LateLowerGCFrame::LocalScan(Function &F) {
                     // we know that the object is a constant as well and doesn't need rooting.
                     RefinedPtr.push_back(-2);
                 }
-                if (!LI->getType()->isPointerTy() ||
-                        LI->getType()->getPointerAddressSpace() != AddressSpace::Loaded) {
+                if (!Ty->isPointerTy() || Ty->getPointerAddressSpace() != AddressSpace::Loaded) {
                     MaybeNoteDef(S, BBS, LI, BBS.Safepoints, std::move(RefinedPtr));
                 }
                 NoteOperandUses(S, BBS, I);
@@ -1990,21 +2035,16 @@ bool LateLowerGCFrame::CleanupIR(Function &F, State *S) {
     for (BasicBlock &BB : F) {
         for (auto it = BB.begin(); it != BB.end();) {
             Instruction *I = &*it;
-            if (isa<LoadInst>(I) || isa<StoreInst>(I)) {
-                // strip all constant alias information, as it might depend on the gc having
-                // preserved a gc root, which stops being true after this pass (#32215)
-                // we'd like to call RewriteStatepointsForGC::stripNonValidData here, but
-                // that function asserts that the GC strategy must be named either "statepoint-example" or "coreclr",
-                // while we don't give a name to our GC in the IR, and C++ scope rules prohibit us from using it,
-                // so instead we reimplement it here badly
-                if (I->getMetadata(LLVMContext::MD_invariant_load))
-                    I->setMetadata(LLVMContext::MD_invariant_load, NULL);
-                if (MDNode *TBAA = I->getMetadata(LLVMContext::MD_tbaa)) {
-                    if (TBAA->getNumOperands() == 4 && isTBAA(TBAA, {"jtbaa_const"})) {
-                        MDNode *MutableTBAA = createMutableTBAAAccessTag(TBAA);
-                        if (MutableTBAA != TBAA)
-                            I->setMetadata(LLVMContext::MD_tbaa, MutableTBAA);
-                    }
+            // strip all constant alias information, as it might depend on the gc having
+            // preserved a gc root, which stops being true after this pass (#32215)
+            // similar to RewriteStatepointsForGC::stripNonValidData, but less aggressive
+            if (I->getMetadata(LLVMContext::MD_invariant_load))
+                I->setMetadata(LLVMContext::MD_invariant_load, NULL);
+            if (MDNode *TBAA = I->getMetadata(LLVMContext::MD_tbaa)) {
+                if (TBAA->getNumOperands() == 4 && isTBAA(TBAA, {"jtbaa_const"})) {
+                    MDNode *MutableTBAA = createMutableTBAAAccessTag(TBAA);
+                    if (MutableTBAA != TBAA)
+                        I->setMetadata(LLVMContext::MD_tbaa, MutableTBAA);
                 }
             }
             auto *CI = dyn_cast<CallInst>(&*it);
diff --git a/src/partr.c b/src/partr.c
index c457643797446..f6cac067f9222 100644
--- a/src/partr.c
+++ b/src/partr.c
@@ -461,6 +461,9 @@ JL_DLLEXPORT jl_task_t *jl_task_get_next(jl_value_t *trypoptask, jl_value_t *q)
                     // TODO: this relinquishes responsibility for all event
                     //       to the last thread to do an explicit operation,
                     //       which may starve other threads of critical work
+                    if (jl_atomic_load(&jl_uv_n_waiters) == 0) {
+                        continue;
+                    }
                 }
                 if (!_threadedregion && active && ptls->tid == 0) {
                     // thread 0 is the only thread permitted to run the event loop
diff --git a/stdlib/InteractiveUtils/test/runtests.jl b/stdlib/InteractiveUtils/test/runtests.jl
index 946056e50e667..b96125350630d 100644
--- a/stdlib/InteractiveUtils/test/runtests.jl
+++ b/stdlib/InteractiveUtils/test/runtests.jl
@@ -433,3 +433,9 @@ end
 # buildbot path updating
 file, ln = functionloc(versioninfo, Tuple{})
 @test isfile(file)
+
+@testset "Issue #34434" begin
+    io = IOBuffer()
+    code_native(io, eltype, Tuple{Int})
+    @test occursin("eltype", String(take!(io)))
+end
diff --git a/stdlib/LibGit2/test/libgit2.jl b/stdlib/LibGit2/test/libgit2.jl
index 4f0de2131fc5e..0b3d61c9fe1e7 100644
--- a/stdlib/LibGit2/test/libgit2.jl
+++ b/stdlib/LibGit2/test/libgit2.jl
@@ -600,6 +600,7 @@ end
 end
 
 mktempdir() do dir
+    dir = realpath(dir)
     # test parameters
     repo_url = "https://github.com/JuliaLang/Example.jl"
     cache_repo = joinpath(dir, "Example")
diff --git a/stdlib/LinearAlgebra/src/generic.jl b/stdlib/LinearAlgebra/src/generic.jl
index 0b5c1af380257..2288a34c7a5c1 100644
--- a/stdlib/LinearAlgebra/src/generic.jl
+++ b/stdlib/LinearAlgebra/src/generic.jl
@@ -25,10 +25,23 @@ struct MulAddMul{ais1, bis0, TA, TB}
     beta::TB
 end
 
-MulAddMul(alpha::TA, beta::TB) where {TA, TB} =
-    MulAddMul{isone(alpha), iszero(beta), TA, TB}(alpha, beta)
+@inline function MulAddMul(alpha::TA, beta::TB) where {TA,TB}
+    if isone(alpha)
+        if iszero(beta)
+            return MulAddMul{true,true,TA,TB}(alpha, beta)
+        else
+            return MulAddMul{true,false,TA,TB}(alpha, beta)
+        end
+    else
+        if iszero(beta)
+            return MulAddMul{false,true,TA,TB}(alpha, beta)
+        else
+            return MulAddMul{false,false,TA,TB}(alpha, beta)
+        end
+    end
+end
 
-MulAddMul() = MulAddMul(true, false)
+MulAddMul() = MulAddMul{true,true,Bool,Bool}(true, false)
 
 @inline (::MulAddMul{true})(x) = x
 @inline (p::MulAddMul{false})(x) = x * p.alpha
diff --git a/stdlib/LinearAlgebra/src/matmul.jl b/stdlib/LinearAlgebra/src/matmul.jl
index 1bbd2230c315d..e5c33388a9af0 100644
--- a/stdlib/LinearAlgebra/src/matmul.jl
+++ b/stdlib/LinearAlgebra/src/matmul.jl
@@ -166,7 +166,7 @@ end
 
 @inline function mul!(C::StridedMatrix{T}, A::StridedVecOrMat{T}, B::StridedVecOrMat{T},
                       alpha::Number, beta::Number) where {T<:BlasFloat}
-    return gemm_wrapper!(C, 'N', 'N', A, B, alpha, beta)
+    return gemm_wrapper!(C, 'N', 'N', A, B, MulAddMul(alpha, beta))
 end
 # Complex Matrix times real matrix: We use that it is generally faster to reinterpret the
 # first matrix as a real matrix and carry out real matrix matrix multiply
@@ -307,7 +307,7 @@ lmul!(A, B)
     if A===B
         return syrk_wrapper!(C, 'T', A, alpha, beta)
     else
-        return gemm_wrapper!(C, 'T', 'N', A, B, alpha, beta)
+        return gemm_wrapper!(C, 'T', 'N', A, B, MulAddMul(alpha, beta))
     end
 end
 @inline function mul!(C::AbstractMatrix, transA::Transpose{<:Any,<:AbstractVecOrMat}, B::AbstractVecOrMat,
@@ -322,7 +322,7 @@ end
     if A===B
         return syrk_wrapper!(C, 'N', A, alpha, beta)
     else
-        return gemm_wrapper!(C, 'N', 'T', A, B, alpha, beta)
+        return gemm_wrapper!(C, 'N', 'T', A, B, MulAddMul(alpha, beta))
     end
 end
 # Complex matrix times transposed real matrix. Reinterpret the first matrix to real for efficiency.
@@ -349,7 +349,7 @@ end
                  alpha::Number, beta::Number) where {T<:BlasFloat}
     A = transA.parent
     B = transB.parent
-    return gemm_wrapper!(C, 'T', 'T', A, B, alpha, beta)
+    return gemm_wrapper!(C, 'T', 'T', A, B, MulAddMul(alpha, beta))
 end
 @inline function mul!(C::AbstractMatrix, transA::Transpose{<:Any,<:AbstractVecOrMat}, transB::Transpose{<:Any,<:AbstractVecOrMat},
                  alpha::Number, beta::Number)
@@ -362,7 +362,7 @@ end
                  alpha::Number, beta::Number) where {T<:BlasFloat}
     A = transA.parent
     B = transB.parent
-    return gemm_wrapper!(C, 'T', 'C', A, B, alpha, beta)
+    return gemm_wrapper!(C, 'T', 'C', A, B, MulAddMul(alpha, beta))
 end
 @inline function mul!(C::AbstractMatrix, transA::Transpose{<:Any,<:AbstractVecOrMat}, transB::Adjoint{<:Any,<:AbstractVecOrMat},
                  alpha::Number, beta::Number)
@@ -382,7 +382,7 @@ end
     if A===B
         return herk_wrapper!(C, 'C', A, alpha, beta)
     else
-        return gemm_wrapper!(C, 'C', 'N', A, B, alpha, beta)
+        return gemm_wrapper!(C, 'C', 'N', A, B, MulAddMul(alpha, beta))
     end
 end
 @inline function mul!(C::AbstractMatrix, adjA::Adjoint{<:Any,<:AbstractVecOrMat}, B::AbstractVecOrMat,
@@ -402,7 +402,7 @@ end
     if A === B
         return herk_wrapper!(C, 'N', A, alpha, beta)
     else
-        return gemm_wrapper!(C, 'N', 'C', A, B, alpha, beta)
+        return gemm_wrapper!(C, 'N', 'C', A, B, MulAddMul(alpha, beta))
     end
 end
 @inline function mul!(C::AbstractMatrix, A::AbstractVecOrMat, adjB::Adjoint{<:Any,<:AbstractVecOrMat},
@@ -415,7 +415,7 @@ end
                  alpha::Number, beta::Number) where {T<:BlasFloat}
     A = adjA.parent
     B = adjB.parent
-    return gemm_wrapper!(C, 'C', 'C', A, B, alpha, beta)
+    return gemm_wrapper!(C, 'C', 'C', A, B, MulAddMul(alpha, beta))
 end
 @inline function mul!(C::AbstractMatrix, adjA::Adjoint{<:Any,<:AbstractVecOrMat}, adjB::Adjoint{<:Any,<:AbstractVecOrMat},
                  alpha::Number, beta::Number)
@@ -508,7 +508,7 @@ function syrk_wrapper!(C::StridedMatrix{T}, tA::AbstractChar, A::StridedVecOrMat
             return copytri!(BLAS.syrk!('U', tA, alpha, A, beta, C), 'U')
         end
     end
-    return gemm_wrapper!(C, tA, tAt, A, A, α, β)
+    return gemm_wrapper!(C, tA, tAt, A, A, MulAddMul(α, β))
 end
 
 function herk_wrapper!(C::Union{StridedMatrix{T}, StridedMatrix{Complex{T}}}, tA::AbstractChar, A::Union{StridedVecOrMat{T}, StridedVecOrMat{Complex{T}}},
@@ -547,7 +547,7 @@ function herk_wrapper!(C::Union{StridedMatrix{T}, StridedMatrix{Complex{T}}}, tA
             return copytri!(BLAS.herk!('U', tA, alpha, A, beta, C), 'U', true)
         end
     end
-    return gemm_wrapper!(C, tA, tAt, A, A, α, β)
+    return gemm_wrapper!(C, tA, tAt, A, A, MulAddMul(α, β))
 end
 
 function gemm_wrapper(tA::AbstractChar, tB::AbstractChar,
@@ -561,7 +561,7 @@ end
 
 function gemm_wrapper!(C::StridedVecOrMat{T}, tA::AbstractChar, tB::AbstractChar,
                        A::StridedVecOrMat{T}, B::StridedVecOrMat{T},
-                       α::Number=true, β::Number=false) where {T<:BlasFloat}
+                       _add = MulAddMul()) where {T<:BlasFloat}
     mA, nA = lapack_size(tA, A)
     mB, nB = lapack_size(tB, B)
 
@@ -573,21 +573,21 @@ function gemm_wrapper!(C::StridedVecOrMat{T}, tA::AbstractChar, tB::AbstractChar
         throw(ArgumentError("output matrix must not be aliased with input matrix"))
     end
 
-    if mA == 0 || nA == 0 || nB == 0 || iszero(α)
+    if mA == 0 || nA == 0 || nB == 0 || iszero(_add.alpha)
         if size(C) != (mA, nB)
             throw(DimensionMismatch("C has dimensions $(size(C)), should have ($mA,$nB)"))
         end
-        return _rmul_or_fill!(C, β)
+        return _rmul_or_fill!(C, _add.beta)
     end
 
     if mA == 2 && nA == 2 && nB == 2
-        return matmul2x2!(C, tA, tB, A, B, MulAddMul(α, β))
+        return matmul2x2!(C, tA, tB, A, B, _add)
     end
     if mA == 3 && nA == 3 && nB == 3
-        return matmul3x3!(C, tA, tB, A, B, MulAddMul(α, β))
+        return matmul3x3!(C, tA, tB, A, B, _add)
     end
 
-    alpha, beta = promote(α, β, zero(T))
+    alpha, beta = promote(_add.alpha, _add.beta, zero(T))
     if (alpha isa Union{Bool,T} &&
         beta isa Union{Bool,T} &&
         stride(A, 1) == stride(B, 1) == stride(C, 1) == 1 &&
@@ -596,7 +596,7 @@ function gemm_wrapper!(C::StridedVecOrMat{T}, tA::AbstractChar, tB::AbstractChar
         stride(C, 2) >= size(C, 1))
         return BLAS.gemm!(tA, tB, alpha, A, B, beta, C)
     end
-    generic_matmatmul!(C, tA, tB, A, B, MulAddMul(α, β))
+    generic_matmatmul!(C, tA, tB, A, B, _add)
 end
 
 # blas.jl defines matmul for floats; other integer and mixed precision
diff --git a/stdlib/Pkg.version b/stdlib/Pkg.version
index 6222673205a73..3aa9e0e8baf92 100644
--- a/stdlib/Pkg.version
+++ b/stdlib/Pkg.version
@@ -1,2 +1,2 @@
 PKG_BRANCH = master
-PKG_SHA1 = a1eea5d5bd6493eb233b8e7abcdae6fc7e5751e1
+PKG_SHA1 = 9419c70af69153cd5c4276bff90fbb135e0aa3f1
diff --git a/stdlib/Profile/src/Profile.jl b/stdlib/Profile/src/Profile.jl
index 057bb4d287a40..3a5deea34f08b 100644
--- a/stdlib/Profile/src/Profile.jl
+++ b/stdlib/Profile/src/Profile.jl
@@ -536,7 +536,9 @@ function indent(depth::Int)
     depth < 1 && return ""
     depth <= length(indent_z) && return indent_s[1:indent_z[depth]]
     div, rem = divrem(depth, length(indent_z))
-    return (indent_s^div) * SubString(indent_s, 1, indent_z[rem])
+    indent = indent_s^div
+    rem != 0 && (indent *= SubString(indent_s, 1, indent_z[rem]))
+    return indent
 end
 
 function tree_format(frames::Vector{<:StackFrameTree}, level::Int, cols::Int, maxes, filenamemap::Dict{Symbol,String}, showpointer::Bool)
diff --git a/stdlib/REPL/src/REPLCompletions.jl b/stdlib/REPL/src/REPLCompletions.jl
index edc7468e199cb..0a50345b33e7c 100644
--- a/stdlib/REPL/src/REPLCompletions.jl
+++ b/stdlib/REPL/src/REPLCompletions.jl
@@ -259,7 +259,7 @@ function complete_path(path::AbstractString, pos; use_envpath=false, shell_escap
         end
     end
 
-    matchList = Completion[PathCompletion(shell_escape ? replace(s, r"\s" => s"\\\0") : s) for s in matches]
+    matchList = PathCompletion[PathCompletion(shell_escape ? replace(s, r"\s" => s"\\\0") : s) for s in matches]
     startpos = pos - lastindex(prefix) + 1 - count(isequal(' '), prefix)
     # The pos - lastindex(prefix) + 1 is correct due to `lastindex(prefix)-lastindex(prefix)==0`,
     # hence we need to add one to get the first index. This is also correct when considering
@@ -537,7 +537,7 @@ end
 
 # This needs to be a separate non-inlined function, see #19441
 @noinline function find_dict_matches(identifier, partial_key)
-    matches = []
+    matches = String[]
     for key in keys(identifier)
         rkey = repr(key)
         startswith(rkey,partial_key) && push!(matches,rkey)
diff --git a/stdlib/REPL/test/replcompletions.jl b/stdlib/REPL/test/replcompletions.jl
index 92fdfb8b747f7..3d11937a31078 100644
--- a/stdlib/REPL/test/replcompletions.jl
+++ b/stdlib/REPL/test/replcompletions.jl
@@ -768,7 +768,7 @@ end
 if Sys.iswindows()
     tmp = tempname()
     touch(tmp)
-    path = dirname(tmp)
+    path = realpath(dirname(tmp))
     file = basename(tmp)
     temp_name = basename(path)
     cd(path) do
diff --git a/stdlib/SuiteSparse/src/cholmod.jl b/stdlib/SuiteSparse/src/cholmod.jl
index 7b66ffcdfc32e..699de4398e70c 100644
--- a/stdlib/SuiteSparse/src/cholmod.jl
+++ b/stdlib/SuiteSparse/src/cholmod.jl
@@ -40,15 +40,15 @@ include("cholmod_h.jl")
 
 const CHOLMOD_MIN_VERSION = v"2.1.1"
 
-const common_struct = Vector{UInt8}()
+const common_struct = Vector{Vector{UInt8}}()
 
-const common_supernodal = Ref{Ptr{Cint}}()
-const common_final_ll = Ref{Ptr{Cint}}()
-const common_print = Ref{Ptr{Cint}}()
-const common_itype = Ref{Ptr{Cint}}()
-const common_dtype = Ref{Ptr{Cint}}()
-const common_nmethods = Ref{Ptr{Cint}}()
-const common_postorder = Ref{Ptr{Cint}}()
+const common_supernodal = Vector{Ptr{Cint}}()
+const common_final_ll   = Vector{Ptr{Cint}}()
+const common_print      = Vector{Ptr{Cint}}()
+const common_itype      = Vector{Ptr{Cint}}()
+const common_dtype      = Vector{Ptr{Cint}}()
+const common_nmethods   = Vector{Ptr{Cint}}()
+const common_postorder  = Vector{Ptr{Cint}}()
 
 ### These offsets are defined in SuiteSparse_wrapper.c
 const common_size = ccall((:jl_cholmod_common_size,:libsuitesparse_wrapper),Int,())
@@ -149,20 +149,30 @@ function __init__()
 
         ### Initiate CHOLMOD
         ### common_struct controls the type of factorization and keeps pointers
-        ### to temporary memory.
-        resize!(common_struct, common_size)
-        fill!(common_struct, 0xff)
-
-        common_supernodal[] = pointer(common_struct, cholmod_com_offsets[4] + 1)
-        common_final_ll[] = pointer(common_struct, cholmod_com_offsets[7] + 1)
-        common_print[] = pointer(common_struct, cholmod_com_offsets[13] + 1)
-        common_itype[] = pointer(common_struct, cholmod_com_offsets[18] + 1)
-        common_dtype[] = pointer(common_struct, cholmod_com_offsets[19] + 1)
-        common_nmethods[] = pointer(common_struct, cholmod_com_offsets[15] + 1)
-        common_postorder[] = pointer(common_struct, cholmod_com_offsets[17] + 1)
-
-        start(common_struct)              # initializes CHOLMOD
-        set_print_level(common_struct, 0) # no printing from CHOLMOD by default
+        ### to temporary memory. We need to manage a copy for each thread.
+        nt = Threads.nthreads()
+        resize!(common_struct    , nt)
+        resize!(common_supernodal, nt)
+        resize!(common_final_ll  , nt)
+        resize!(common_print     , nt)
+        resize!(common_itype     , nt)
+        resize!(common_dtype     , nt)
+        resize!(common_nmethods  , nt)
+        resize!(common_postorder , nt)
+        for i in 1:nt
+            common_struct[i] = fill(0xff, common_size)
+
+            common_supernodal[i] = pointer(common_struct[i], cholmod_com_offsets[4] + 1)
+            common_final_ll[i]   = pointer(common_struct[i], cholmod_com_offsets[7] + 1)
+            common_print[i]      = pointer(common_struct[i], cholmod_com_offsets[13] + 1)
+            common_itype[i]      = pointer(common_struct[i], cholmod_com_offsets[18] + 1)
+            common_dtype[i]      = pointer(common_struct[i], cholmod_com_offsets[19] + 1)
+            common_nmethods[i]   = pointer(common_struct[i], cholmod_com_offsets[15] + 1)
+            common_postorder[i]  = pointer(common_struct[i], cholmod_com_offsets[17] + 1)
+
+            start(common_struct[i])              # initializes CHOLMOD
+            set_print_level(common_struct[i], 0) # no printing from CHOLMOD by default
+        end
 
         # Register gc tracked allocator if CHOLMOD is new enough
         if current_version >= v"3.0.0"
@@ -179,7 +189,7 @@ function __init__()
 end
 
 function set_print_level(cm::Vector{UInt8}, lev::Integer)
-    unsafe_store!(common_print[], lev)
+    unsafe_store!(common_print[Threads.threadid()], lev)
 end
 
 ####################
@@ -403,32 +413,32 @@ Factor(FC::FactorComponent) = Factor(FC.F)
 function allocate_dense(m::Integer, n::Integer, d::Integer, ::Type{Tv}) where {Tv<:VTypes}
     Dense(ccall((@cholmod_name("allocate_dense"), :libcholmod), Ptr{C_Dense{Tv}},
                 (Csize_t, Csize_t, Csize_t, Cint, Ptr{Cvoid}),
-                m, n, d, xtyp(Tv), common_struct))
+                m, n, d, xtyp(Tv), common_struct[Threads.threadid()]))
 end
 
 function free!(p::Ptr{C_Dense{Tv}}) where {Tv<:VTypes}
     @isok ccall((@cholmod_name("free_dense"), :libcholmod), Cint,
                 (Ref{Ptr{C_Dense{Tv}}}, Ptr{Cvoid}),
-                p, common_struct)
+                p, common_struct[Threads.threadid()])
 end
 function zeros(m::Integer, n::Integer, ::Type{Tv}) where Tv<:VTypes
     Dense(ccall((@cholmod_name("zeros"), :libcholmod), Ptr{C_Dense{Tv}},
                 (Csize_t, Csize_t, Cint, Ptr{UInt8}),
-                m, n, xtyp(Tv), common_struct))
+                m, n, xtyp(Tv), common_struct[Threads.threadid()]))
 end
 zeros(m::Integer, n::Integer) = zeros(m, n, Float64)
 
 function ones(m::Integer, n::Integer, ::Type{Tv}) where Tv<:VTypes
     Dense(ccall((@cholmod_name("ones"), :libcholmod), Ptr{C_Dense{Tv}},
                 (Csize_t, Csize_t, Cint, Ptr{UInt8}),
-                m, n, xtyp(Tv), common_struct))
+                m, n, xtyp(Tv), common_struct[Threads.threadid()]))
 end
 ones(m::Integer, n::Integer) = ones(m, n, Float64)
 
 function eye(m::Integer, n::Integer, ::Type{Tv}) where Tv<:VTypes
     Dense(ccall((@cholmod_name("eye"), :libcholmod), Ptr{C_Dense{Tv}},
                 (Csize_t, Csize_t, Cint, Ptr{UInt8}),
-                m, n, xtyp(Tv), common_struct))
+                m, n, xtyp(Tv), common_struct[Threads.threadid()]))
 end
 eye(m::Integer, n::Integer) = eye(m, n, Float64)
 eye(n::Integer) = eye(n, n, Float64)
@@ -436,13 +446,13 @@ eye(n::Integer) = eye(n, n, Float64)
 function copy(A::Dense{Tv}) where Tv<:VTypes
     Dense(ccall((@cholmod_name("copy_dense"), :libcholmod), Ptr{C_Dense{Tv}},
                 (Ptr{C_Dense{Tv}}, Ptr{UInt8}),
-                A, common_struct))
+                A, common_struct[Threads.threadid()]))
 end
 
 function sort!(S::Sparse{Tv}) where Tv<:VTypes
     @isok ccall((@cholmod_name("sort"), :libcholmod), Cint,
                 (Ptr{C_Sparse{Tv}}, Ptr{UInt8}),
-                S, common_struct)
+                S, common_struct[Threads.threadid()])
     return S
 end
 
@@ -458,14 +468,14 @@ function norm_dense(D::Dense{Tv}, p::Integer) where Tv<:VTypes
     end
     ccall((@cholmod_name("norm_dense"), :libcholmod), Cdouble,
         (Ptr{C_Dense{Tv}}, Cint, Ptr{UInt8}),
-          D, p, common_struct)
+          D, p, common_struct[Threads.threadid()])
 end
 
 ### cholmod_check.h ###
 function check_dense(A::Dense{Tv}) where Tv<:VTypes
     ccall((@cholmod_name("check_dense"), :libcholmod), Cint,
           (Ptr{C_Dense{Tv}}, Ptr{UInt8}),
-          pointer(A), common_struct) != 0
+          pointer(A), common_struct[Threads.threadid()]) != 0
 end
 
 # Non-Dense wrappers
@@ -477,40 +487,40 @@ function allocate_sparse(nrow::Integer, ncol::Integer, nzmax::Integer,
                 (Csize_t, Csize_t, Csize_t, Cint,
                  Cint, Cint, Cint, Ptr{Cvoid}),
                 nrow, ncol, nzmax, sorted,
-                packed, stype, xtyp(Tv), common_struct))
+                packed, stype, xtyp(Tv), common_struct[Threads.threadid()]))
 end
 
 function free!(ptr::Ptr{C_Sparse{Tv}}) where Tv<:VTypes
     @isok ccall((@cholmod_name("free_sparse"), :libcholmod), Cint,
             (Ref{Ptr{C_Sparse{Tv}}}, Ptr{UInt8}),
-                ptr, common_struct)
+                ptr, common_struct[Threads.threadid()])
 end
 
 function free!(ptr::Ptr{C_Factor{Tv}}) where Tv<:VTypes
     # Warning! Important that finalizer doesn't modify the global Common struct.
     @isok ccall((@cholmod_name("free_factor"), :libcholmod), Cint,
             (Ref{Ptr{C_Factor{Tv}}}, Ptr{Cvoid}),
-                ptr, common_struct)
+                ptr, common_struct[Threads.threadid()])
 end
 
 function aat(A::Sparse{Tv}, fset::Vector{SuiteSparse_long}, mode::Integer) where Tv<:VRealTypes
     Sparse(ccall((@cholmod_name("aat"), :libcholmod),
         Ptr{C_Sparse{Tv}},
             (Ptr{C_Sparse{Tv}}, Ptr{SuiteSparse_long}, Csize_t, Cint, Ptr{UInt8}),
-                A, fset, length(fset), mode, common_struct))
+                A, fset, length(fset), mode, common_struct[Threads.threadid()]))
 end
 
 function sparse_to_dense(A::Sparse{Tv}) where Tv<:VTypes
     Dense(ccall((@cholmod_name("sparse_to_dense"),:libcholmod),
         Ptr{C_Dense{Tv}},
             (Ptr{C_Sparse{Tv}}, Ptr{UInt8}),
-                A, common_struct))
+                A, common_struct[Threads.threadid()]))
 end
 function dense_to_sparse(D::Dense{Tv}, ::Type{SuiteSparse_long}) where Tv<:VTypes
     Sparse(ccall((@cholmod_name("dense_to_sparse"),:libcholmod),
         Ptr{C_Sparse{Tv}},
             (Ptr{C_Dense{Tv}}, Cint, Ptr{UInt8}),
-                D, true, common_struct))
+                D, true, common_struct[Threads.threadid()]))
 end
 
 function factor_to_sparse!(F::Factor{Tv}) where Tv<:VTypes
@@ -519,88 +529,88 @@ function factor_to_sparse!(F::Factor{Tv}) where Tv<:VTypes
     Sparse(ccall((@cholmod_name("factor_to_sparse"),:libcholmod),
         Ptr{C_Sparse{Tv}},
             (Ptr{C_Factor{Tv}}, Ptr{UInt8}),
-                F, common_struct))
+                F, common_struct[Threads.threadid()]))
 end
 
 function change_factor!(F::Factor{Tv}, to_ll::Bool, to_super::Bool, to_packed::Bool,
                         to_monotonic::Bool) where Tv<:VTypes
     @isok ccall((@cholmod_name("change_factor"),:libcholmod), Cint,
             (Cint, Cint, Cint, Cint, Cint, Ptr{C_Factor{Tv}}, Ptr{UInt8}),
-                xtyp(Tv), to_ll, to_super, to_packed, to_monotonic, F, common_struct)
+                xtyp(Tv), to_ll, to_super, to_packed, to_monotonic, F, common_struct[Threads.threadid()])
 end
 
 function check_sparse(A::Sparse{Tv}) where Tv<:VTypes
     ccall((@cholmod_name("check_sparse"),:libcholmod), Cint,
           (Ptr{C_Sparse{Tv}}, Ptr{UInt8}),
-           A, common_struct) != 0
+           A, common_struct[Threads.threadid()]) != 0
 end
 
 function check_factor(F::Factor{Tv}) where Tv<:VTypes
     ccall((@cholmod_name("check_factor"),:libcholmod), Cint,
           (Ptr{C_Factor{Tv}}, Ptr{UInt8}),
-           F, common_struct) != 0
+           F, common_struct[Threads.threadid()]) != 0
 end
 
 function nnz(A::Sparse{Tv}) where Tv<:VTypes
     ccall((@cholmod_name("nnz"),:libcholmod), Int,
             (Ptr{C_Sparse{Tv}}, Ptr{UInt8}),
-                A, common_struct)
+                A, common_struct[Threads.threadid()])
 end
 
 function speye(m::Integer, n::Integer, ::Type{Tv}) where Tv<:VTypes
     Sparse(ccall((@cholmod_name("speye"), :libcholmod),
         Ptr{C_Sparse{Tv}},
             (Csize_t, Csize_t, Cint, Ptr{UInt8}),
-                m, n, xtyp(Tv), common_struct))
+                m, n, xtyp(Tv), common_struct[Threads.threadid()]))
 end
 
 function spzeros(m::Integer, n::Integer, nzmax::Integer, ::Type{Tv}) where Tv<:VTypes
     Sparse(ccall((@cholmod_name("spzeros"), :libcholmod),
         Ptr{C_Sparse{Tv}},
             (Csize_t, Csize_t, Csize_t, Cint, Ptr{UInt8}),
-             m, n, nzmax, xtyp(Tv), common_struct))
+             m, n, nzmax, xtyp(Tv), common_struct[Threads.threadid()]))
 end
 
 function transpose_(A::Sparse{Tv}, values::Integer) where Tv<:VTypes
     Sparse(ccall((@cholmod_name("transpose"),:libcholmod),
         Ptr{C_Sparse{Tv}},
             (Ptr{C_Sparse{Tv}}, Cint, Ptr{UInt8}),
-                A, values, common_struct))
+                A, values, common_struct[Threads.threadid()]))
 end
 
 function copy(F::Factor{Tv}) where Tv<:VTypes
     Factor(ccall((@cholmod_name("copy_factor"),:libcholmod),
         Ptr{C_Factor{Tv}},
             (Ptr{C_Factor{Tv}}, Ptr{UInt8}),
-                F, common_struct))
+                F, common_struct[Threads.threadid()]))
 end
 function copy(A::Sparse{Tv}) where Tv<:VTypes
     Sparse(ccall((@cholmod_name("copy_sparse"),:libcholmod),
         Ptr{C_Sparse{Tv}},
             (Ptr{C_Sparse{Tv}}, Ptr{UInt8}),
-                A, common_struct))
+                A, common_struct[Threads.threadid()]))
 end
 function copy(A::Sparse{Tv}, stype::Integer, mode::Integer) where Tv<:VRealTypes
     Sparse(ccall((@cholmod_name("copy"),:libcholmod),
         Ptr{C_Sparse{Tv}},
             (Ptr{C_Sparse{Tv}}, Cint, Cint, Ptr{UInt8}),
-                A, stype, mode, common_struct))
+                A, stype, mode, common_struct[Threads.threadid()]))
 end
 
 ### cholmod_check.h ###
 function print_sparse(A::Sparse{Tv}, name::String) where Tv<:VTypes
     isascii(name) || error("non-ASCII name: $name")
-    set_print_level(common_struct, 3)
+    set_print_level(common_struct[Threads.threadid()], 3)
     @isok ccall((@cholmod_name("print_sparse"),:libcholmod), Cint,
             (Ptr{C_Sparse{Tv}}, Ptr{UInt8}, Ptr{UInt8}),
-                 A, name, common_struct)
+                 A, name, common_struct[Threads.threadid()])
     nothing
 end
 function print_factor(F::Factor{Tv}, name::String) where Tv<:VTypes
-    set_print_level(common_struct, 3)
+    set_print_level(common_struct[Threads.threadid()], 3)
     @isok ccall((@cholmod_name("print_factor"),:libcholmod), Cint,
             (Ptr{C_Factor{Tv}}, Ptr{UInt8}, Ptr{UInt8}),
-                F, name, common_struct)
+                F, name, common_struct[Threads.threadid()])
     nothing
 end
 
@@ -617,7 +627,7 @@ function ssmult(A::Sparse{Tv}, B::Sparse{Tv}, stype::Integer,
             (Ptr{C_Sparse{Tv}}, Ptr{C_Sparse{Tv}}, Cint, Cint,
                 Cint, Ptr{UInt8}),
              A, B, stype, values,
-                sorted, common_struct))
+                sorted, common_struct[Threads.threadid()]))
 end
 
 function norm_sparse(A::Sparse{Tv}, norm::Integer) where Tv<:VTypes
@@ -626,14 +636,14 @@ function norm_sparse(A::Sparse{Tv}, norm::Integer) where Tv<:VTypes
     end
     ccall((@cholmod_name("norm_sparse"), :libcholmod), Cdouble,
             (Ptr{C_Sparse{Tv}}, Cint, Ptr{UInt8}),
-                A, norm, common_struct)
+                A, norm, common_struct[Threads.threadid()])
 end
 
 function horzcat(A::Sparse{Tv}, B::Sparse{Tv}, values::Bool) where Tv<:VRealTypes
     Sparse(ccall((@cholmod_name("horzcat"), :libcholmod),
         Ptr{C_Sparse{Tv}},
             (Ptr{C_Sparse{Tv}}, Ptr{C_Sparse{Tv}}, Cint, Ptr{UInt8}),
-             A, B, values, common_struct))
+             A, B, values, common_struct[Threads.threadid()]))
 end
 
 function scale!(S::Dense{Tv}, scale::Integer, A::Sparse{Tv}) where Tv<:VRealTypes
@@ -662,7 +672,7 @@ function scale!(S::Dense{Tv}, scale::Integer, A::Sparse{Tv}) where Tv<:VRealType
     sA = unsafe_load(pointer(A))
     @isok ccall((@cholmod_name("scale"),:libcholmod), Cint,
             (Ptr{C_Dense{Tv}}, Cint, Ptr{C_Sparse{Tv}}, Ptr{UInt8}),
-                S, scale, A, common_struct)
+                S, scale, A, common_struct[Threads.threadid()])
     A
 end
 
@@ -678,7 +688,7 @@ function sdmult!(A::Sparse{Tv}, transpose::Bool,
             (Ptr{C_Sparse{Tv}}, Cint,
              Ref{ComplexF64}, Ref{ComplexF64},
              Ptr{C_Dense{Tv}}, Ptr{C_Dense{Tv}}, Ptr{UInt8}),
-                A, transpose, α, β, X, Y, common_struct)
+                A, transpose, α, β, X, Y, common_struct[Threads.threadid()])
     Y
 end
 
@@ -686,7 +696,7 @@ function vertcat(A::Sparse{Tv}, B::Sparse{Tv}, values::Bool) where Tv<:VRealType
     Sparse(ccall((@cholmod_name("vertcat"), :libcholmod),
             Ptr{C_Sparse{Tv}},
             (Ptr{C_Sparse{Tv}}, Ptr{C_Sparse{Tv}}, Cint, Ptr{UInt8}),
-                A, B, values, common_struct))
+                A, B, values, common_struct[Threads.threadid()]))
 end
 
 function symmetry(A::Sparse{Tv}, option::Integer) where Tv<:VTypes
@@ -698,7 +708,7 @@ function symmetry(A::Sparse{Tv}, option::Integer) where Tv<:VTypes
             (Ptr{C_Sparse{Tv}}, Cint, Ptr{SuiteSparse_long}, Ptr{SuiteSparse_long},
                 Ptr{SuiteSparse_long}, Ptr{SuiteSparse_long}, Ptr{UInt8}),
                     A, option, xmatched, pmatched,
-                        nzoffdiag, nzdiag, common_struct)
+                        nzoffdiag, nzdiag, common_struct[Threads.threadid()])
     rv, xmatched[], pmatched[], nzoffdiag[], nzdiag[]
 end
 
@@ -751,7 +761,7 @@ function solve(sys::Integer, F::Factor{Tv}, B::Dense{Tv}) where Tv<:VTypes
     end
     Dense(ccall((@cholmod_name("solve"),:libcholmod), Ptr{C_Dense{Tv}},
             (Cint, Ptr{C_Factor{Tv}}, Ptr{C_Dense{Tv}}, Ptr{UInt8}),
-                sys, F, B, common_struct))
+                sys, F, B, common_struct[Threads.threadid()]))
 end
 
 function spsolve(sys::Integer, F::Factor{Tv}, B::Sparse{Tv}) where Tv<:VTypes
@@ -762,7 +772,7 @@ function spsolve(sys::Integer, F::Factor{Tv}, B::Sparse{Tv}) where Tv<:VTypes
     Sparse(ccall((@cholmod_name("spsolve"),:libcholmod),
         Ptr{C_Sparse{Tv}},
             (Cint, Ptr{C_Factor{Tv}}, Ptr{C_Sparse{Tv}}, Ptr{UInt8}),
-                sys, F, B, common_struct))
+                sys, F, B, common_struct[Threads.threadid()]))
 end
 
 # Autodetects the types
@@ -770,7 +780,7 @@ function read_sparse(file::Libc.FILE, ::Type{SuiteSparse_long})
     ptr = ccall((@cholmod_name("read_sparse"), :libcholmod),
         Ptr{C_Sparse{Cvoid}},
             (Ptr{Cvoid}, Ptr{UInt8}),
-                file.ptr, common_struct)
+                file.ptr, common_struct[Threads.threadid()])
     if ptr == C_NULL
         throw(ArgumentError("sparse matrix construction failed. Check that input file is valid."))
     end
@@ -1272,14 +1282,14 @@ function fact_(A::Sparse{<:VTypes}, cm::Array{UInt8};
     sA.stype == 0 && throw(ArgumentError("sparse matrix is not symmetric/Hermitian"))
 
     if !postorder
-        unsafe_store!(common_postorder[], 0)
+        unsafe_store!(common_postorder[Threads.threadid()], 0)
     end
 
     if perm === nothing || isempty(perm) # TODO: deprecate empty perm
         F = analyze(A, cm)
     else # user permutation provided
         if userperm_only # use perm even if it is worse than AMD
-            unsafe_store!(common_nmethods[], 1)
+            unsafe_store!(common_nmethods[Threads.threadid()], 1)
         end
         F = analyze_p(A, SuiteSparse_long[p-1 for p in perm], cm)
     end
@@ -1290,10 +1300,10 @@ end
 function cholesky!(F::Factor{Tv}, A::Sparse{Tv};
                    shift::Real=0.0, check::Bool = true) where Tv
     # Makes it an LLt
-    unsafe_store!(common_final_ll[], 1)
+    unsafe_store!(common_final_ll[Threads.threadid()], 1)
 
     # Compute the numerical factorization
-    factorize_p!(A, shift, F, common_struct)
+    factorize_p!(A, shift, F, common_struct[Threads.threadid()])
 
     check && (issuccess(F) || throw(LinearAlgebra.PosDefException(1)))
     return F
@@ -1326,7 +1336,7 @@ cholesky!(F::Factor, A::Union{SparseMatrixCSC{T},
 function cholesky(A::Sparse; shift::Real=0.0, check::Bool = true,
     perm::Union{Nothing,AbstractVector{SuiteSparse_long}}=nothing)
 
-    cm = defaults(common_struct)
+    cm = defaults(common_struct[Threads.threadid()])
     set_print_level(cm, 0)
 
     # Compute the symbolic factorization
@@ -1450,7 +1460,7 @@ cholesky(A::Union{SparseMatrixCSC{T}, SparseMatrixCSC{Complex{T}},
 
 function ldlt!(F::Factor{Tv}, A::Sparse{Tv};
                shift::Real=0.0, check::Bool = true) where Tv
-    cm = defaults(common_struct)
+    cm = defaults(common_struct[Threads.threadid()])
     set_print_level(cm, 0)
 
     # Makes it an LDLt
@@ -1490,13 +1500,13 @@ ldlt!(F::Factor, A::Union{SparseMatrixCSC{T},
 function ldlt(A::Sparse; shift::Real=0.0, check::Bool = true,
     perm::Union{Nothing,AbstractVector{SuiteSparse_long}}=nothing)
 
-    cm = defaults(common_struct)
+    cm = defaults(common_struct[Threads.threadid()])
     set_print_level(cm, 0)
 
     # Makes it an LDLt
-    unsafe_store!(common_final_ll[], 0)
+    unsafe_store!(common_final_ll[Threads.threadid()], 0)
     # Really make sure it's an LDLt by avoiding supernodal factorization
-    unsafe_store!(common_supernodal[], 0)
+    unsafe_store!(common_supernodal[Threads.threadid()], 0)
 
     # Compute the symbolic factorization
     F = fact_(A, cm; perm = perm)
@@ -1571,7 +1581,7 @@ function lowrankupdowndate!(F::Factor{Tv}, C::Sparse{Tv}, update::Cint) where Tv
     end
     @isok ccall((@cholmod_name("updown"), :libcholmod), Cint,
         (Cint, Ptr{C_Sparse{Tv}}, Ptr{C_Factor{Tv}}, Ptr{Cvoid}),
-        update, C, F, common_struct)
+        update, C, F, common_struct[Threads.threadid()])
     F
 end
 
diff --git a/stdlib/SuiteSparse/src/spqr.jl b/stdlib/SuiteSparse/src/spqr.jl
index d5bc42562a8c7..983f7ba37e017 100644
--- a/stdlib/SuiteSparse/src/spqr.jl
+++ b/stdlib/SuiteSparse/src/spqr.jl
@@ -63,7 +63,7 @@ function _qr!(ordering::Integer, tol::Real, econ::Integer, getCTX::Integer,
         H,              # m-by-nh Householder vectors
         HPinv,          # size m row permutation
         HTau,           # 1-by-nh Householder coefficients
-        CHOLMOD.common_struct) # /* workspace and parameters */
+        CHOLMOD.common_struct[Threads.threadid()]) # /* workspace and parameters */
 
     if rnk < 0
         error("Sparse QR factorization failed")
@@ -82,7 +82,7 @@ function _qr!(ordering::Integer, tol::Real, econ::Integer, getCTX::Integer,
         # the common struct is updated
         ccall((:cholmod_l_free, :libcholmod), Cvoid,
             (Csize_t, Cint, Ptr{CHOLMOD.SuiteSparse_long}, Ptr{Cvoid}),
-            n, sizeof(CHOLMOD.SuiteSparse_long), e, CHOLMOD.common_struct)
+            n, sizeof(CHOLMOD.SuiteSparse_long), e, CHOLMOD.common_struct[Threads.threadid()])
     end
     hpinv = HPinv[]
     if hpinv == C_NULL
@@ -97,7 +97,7 @@ function _qr!(ordering::Integer, tol::Real, econ::Integer, getCTX::Integer,
         # the common struct is updated
         ccall((:cholmod_l_free, :libcholmod), Cvoid,
             (Csize_t, Cint, Ptr{CHOLMOD.SuiteSparse_long}, Ptr{Cvoid}),
-            m, sizeof(CHOLMOD.SuiteSparse_long), hpinv, CHOLMOD.common_struct)
+            m, sizeof(CHOLMOD.SuiteSparse_long), hpinv, CHOLMOD.common_struct[Threads.threadid()])
     end
 
     return rnk, _E, _HPinv
diff --git a/stdlib/SuiteSparse/test/cholmod.jl b/stdlib/SuiteSparse/test/cholmod.jl
index 5c3be022daa1a..c19c3726dd979 100644
--- a/stdlib/SuiteSparse/test/cholmod.jl
+++ b/stdlib/SuiteSparse/test/cholmod.jl
@@ -234,7 +234,7 @@ end
 @testset "illegal dtype (for now but should be supported at some point)" begin
     p = ccall((:cholmod_l_allocate_sparse, :libcholmod), Ptr{CHOLMOD.C_Sparse{Cvoid}},
         (Csize_t, Csize_t, Csize_t, Cint, Cint, Cint, Cint, Ptr{Cvoid}),
-        1, 1, 1, true, true, 0, CHOLMOD.REAL, CHOLMOD.common_struct)
+        1, 1, 1, true, true, 0, CHOLMOD.REAL, CHOLMOD.common_struct[Threads.threadid()])
     puint = convert(Ptr{UInt32}, p)
     unsafe_store!(puint, CHOLMOD.SINGLE, 3*div(sizeof(Csize_t), 4) + 5*div(sizeof(Ptr{Cvoid}), 4) + 4)
     @test_throws CHOLMOD.CHOLMODException CHOLMOD.Sparse(p)
@@ -243,7 +243,7 @@ end
 @testset "illegal dtype" begin
     p = ccall((:cholmod_l_allocate_sparse, :libcholmod), Ptr{CHOLMOD.C_Sparse{Cvoid}},
         (Csize_t, Csize_t, Csize_t, Cint, Cint, Cint, Cint, Ptr{Cvoid}),
-        1, 1, 1, true, true, 0, CHOLMOD.REAL, CHOLMOD.common_struct)
+        1, 1, 1, true, true, 0, CHOLMOD.REAL, CHOLMOD.common_struct[Threads.threadid()])
     puint = convert(Ptr{UInt32}, p)
     unsafe_store!(puint, 5, 3*div(sizeof(Csize_t), 4) + 5*div(sizeof(Ptr{Cvoid}), 4) + 4)
     @test_throws CHOLMOD.CHOLMODException CHOLMOD.Sparse(p)
@@ -252,7 +252,7 @@ end
 @testset "illegal xtype" begin
     p = ccall((:cholmod_l_allocate_sparse, :libcholmod), Ptr{CHOLMOD.C_Sparse{Cvoid}},
         (Csize_t, Csize_t, Csize_t, Cint, Cint, Cint, Cint, Ptr{Cvoid}),
-        1, 1, 1, true, true, 0, CHOLMOD.REAL, CHOLMOD.common_struct)
+        1, 1, 1, true, true, 0, CHOLMOD.REAL, CHOLMOD.common_struct[Threads.threadid()])
     puint = convert(Ptr{UInt32}, p)
     unsafe_store!(puint, 3, 3*div(sizeof(Csize_t), 4) + 5*div(sizeof(Ptr{Cvoid}), 4) + 3)
     @test_throws CHOLMOD.CHOLMODException CHOLMOD.Sparse(p)
@@ -261,7 +261,7 @@ end
 @testset "illegal itype I" begin
     p = ccall((:cholmod_l_allocate_sparse, :libcholmod), Ptr{CHOLMOD.C_Sparse{Cvoid}},
         (Csize_t, Csize_t, Csize_t, Cint, Cint, Cint, Cint, Ptr{Cvoid}),
-        1, 1, 1, true, true, 0, CHOLMOD.REAL, CHOLMOD.common_struct)
+        1, 1, 1, true, true, 0, CHOLMOD.REAL, CHOLMOD.common_struct[Threads.threadid()])
     puint = convert(Ptr{UInt32}, p)
     unsafe_store!(puint, CHOLMOD.INTLONG, 3*div(sizeof(Csize_t), 4) + 5*div(sizeof(Ptr{Cvoid}), 4) + 2)
     @test_throws CHOLMOD.CHOLMODException CHOLMOD.Sparse(p)
@@ -270,7 +270,7 @@ end
 @testset "illegal itype II" begin
     p = ccall((:cholmod_l_allocate_sparse, :libcholmod), Ptr{CHOLMOD.C_Sparse{Cvoid}},
         (Csize_t, Csize_t, Csize_t, Cint, Cint, Cint, Cint, Ptr{Cvoid}),
-        1, 1, 1, true, true, 0, CHOLMOD.REAL, CHOLMOD.common_struct)
+        1, 1, 1, true, true, 0, CHOLMOD.REAL, CHOLMOD.common_struct[Threads.threadid()])
     puint = convert(Ptr{UInt32}, p)
     unsafe_store!(puint,  5, 3*div(sizeof(Csize_t), 4) + 5*div(sizeof(Ptr{Cvoid}), 4) + 2)
     @test_throws CHOLMOD.CHOLMODException CHOLMOD.Sparse(p)
@@ -321,7 +321,7 @@ end
 @testset "test free!" begin
     p = ccall((:cholmod_l_allocate_sparse, :libcholmod), Ptr{CHOLMOD.C_Sparse{Float64}},
         (Csize_t, Csize_t, Csize_t, Cint, Cint, Cint, Cint, Ptr{Cvoid}),
-        1, 1, 1, true, true, 0, CHOLMOD.REAL, CHOLMOD.common_struct)
+        1, 1, 1, true, true, 0, CHOLMOD.REAL, CHOLMOD.common_struct[Threads.threadid()])
     @test CHOLMOD.free!(p)
 end
 
diff --git a/stdlib/SuiteSparse/test/runtests.jl b/stdlib/SuiteSparse/test/runtests.jl
index d317023c6c84d..cde54e9488818 100644
--- a/stdlib/SuiteSparse/test/runtests.jl
+++ b/stdlib/SuiteSparse/test/runtests.jl
@@ -4,7 +4,27 @@ using Test, Random
 using SuiteSparse, LinearAlgebra, SparseArrays
 
 if Base.USE_GPL_LIBS
-   include("umfpack.jl")
-   include("cholmod.jl")
-   include("spqr.jl")
+    include("umfpack.jl")
+    include("cholmod.jl")
+    include("spqr.jl")
+
+    # Test multithreaded execution
+    let p, cmd = `$(Base.julia_cmd()) --depwarn=error --startup-file=no threads.jl`
+        # test both nthreads==1 and nthreads>1. spawn a process to test whichever
+        # case we are not running currently.
+        other_nthreads = Threads.nthreads() == 1 ? 4 : 1
+        p = run(
+                pipeline(
+                    setenv(
+                        cmd,
+                        "JULIA_NUM_THREADS" => other_nthreads,
+                        dir=@__DIR__()),
+                    stdout = stdout,
+                    stderr = stderr),
+                wait = false)
+        include("threads.jl")
+        if !success(p)
+            error("SuiteSparse threads test failed with nthreads == $other_nthreads")
+        end
+    end
 end
diff --git a/stdlib/SuiteSparse/test/threads.jl b/stdlib/SuiteSparse/test/threads.jl
new file mode 100644
index 0000000000000..76b4acd540779
--- /dev/null
+++ b/stdlib/SuiteSparse/test/threads.jl
@@ -0,0 +1,20 @@
+using Test, LinearAlgebra, SparseArrays
+
+@testset "threaded SuiteSparse tests" begin
+    A = sprandn(200, 200, 0.2)
+    b = rand(200)
+
+    function test(n::Integer)
+        _A = A[1:n, 1:n]
+        _b = b[1:n]
+        x = qr(_A) \ _b
+        return norm(x)
+    end
+
+    res_threads = zeros(100)
+    Threads.@threads for i in 1:100
+        res_threads[i] = test(i + 100)
+    end
+
+    @test res_threads ≈ [test(i + 100) for i in 1:100]
+end
diff --git a/test/cmdlineargs.jl b/test/cmdlineargs.jl
index b9769b74bcbf2..8356f36f7a828 100644
--- a/test/cmdlineargs.jl
+++ b/test/cmdlineargs.jl
@@ -407,6 +407,9 @@ let exename = `$(Base.julia_cmd()) --startup-file=no`
 
     # test the program name remains constant
     mktempdir() do dir
+        # dir can be case-incorrect sometimes
+        dir = realpath(dir)
+
         a = joinpath(dir, "a.jl")
         b = joinpath(dir, "b.jl")
         c = joinpath(dir, ".julia", "config", "startup.jl")
@@ -430,19 +433,19 @@ let exename = `$(Base.julia_cmd()) --startup-file=no`
                 [a, a,
                  b, a]
             @test readsplit(`$exename -L $b -e 'exit(0)'`) ==
-                [realpath(b), ""]
+                [b, ""]
             @test readsplit(`$exename -L $b $a`) ==
-                [realpath(b), a,
+                [b, a,
                  a, a,
                  b, a]
             @test readsplit(`$exename --startup-file=yes -e 'exit(0)'`) ==
                 [c, ""]
             @test readsplit(`$exename --startup-file=yes -L $b -e 'exit(0)'`) ==
                 [c, "",
-                 realpath(b), ""]
+                 b, ""]
             @test readsplit(`$exename --startup-file=yes -L $b $a`) ==
                 [c, a,
-                 realpath(b), a,
+                 b, a,
                  a, a,
                  b, a]
         end
diff --git a/test/compiler/codegen.jl b/test/compiler/codegen.jl
index ab1b262842f46..41e153e93544f 100644
--- a/test/compiler/codegen.jl
+++ b/test/compiler/codegen.jl
@@ -426,3 +426,10 @@ function f33590(b, x)
 end
 @test f33590(true, (3,)) == (3,)
 @test f33590(false, (3,)) == (4,)
+
+# issue 29864
+const c29864 = VecElement{Union{Int,Nothing}}(2)
+@noinline f29864() = c29864
+@noinline g29864() = VecElement{Union{Int,Nothing}}(3)
+@test f29864().value === 2
+@test g29864().value === 3
diff --git a/test/compiler/inference.jl b/test/compiler/inference.jl
index b275cdf904757..15e03aefd6a1b 100644
--- a/test/compiler/inference.jl
+++ b/test/compiler/inference.jl
@@ -2492,3 +2492,14 @@ struct X33954
 end
 f33954(x) = rand(Bool) ? f33954((x,)) : x
 @test Base.return_types(f33954, Tuple{X33954})[1] >: X33954
+
+# issue #34752
+struct a34752{T} end
+function a34752(c, d...)
+    length(d) > 1 || error()
+end
+function h34752()
+    g = Tuple[(42, Any[42][1], 42)][1]
+    a34752(g...)
+end
+@test h34752() === true
diff --git a/test/llvmpasses/gcroots.ll b/test/llvmpasses/gcroots.ll
index fbccd3592b77a..76c409c17289f 100644
--- a/test/llvmpasses/gcroots.ll
+++ b/test/llvmpasses/gcroots.ll
@@ -618,6 +618,67 @@ top:
     ret i8 %add
 }
 
+define i8 @vector_arrayptrs() {
+; CHECK-LABEL: @vector_arrayptrs
+; CHECK: %gcframe = alloca %jl_value_t addrspace(10)*, i32 3
+; CHECK: [[GEP0:%.*]] = getelementptr %jl_value_t addrspace(10)*, %jl_value_t addrspace(10)** %gcframe, i32 2
+; CHECK: store %jl_value_t addrspace(10)* %obj1, %jl_value_t addrspace(10)** [[GEP0]]
+;
+top:
+   %ptls = call %jl_value_t*** @julia.ptls_states()
+   %obj1 = call %jl_value_t addrspace(10) *@alloc()
+   %decayed = addrspacecast %jl_value_t addrspace(10) *%obj1 to %jl_value_t addrspace(11) *
+   %arrayptrptr = bitcast %jl_value_t addrspace(11) *%decayed to <2 x i8 addrspace(13)*> addrspace(11)*
+   %arrayptrs = load <2 x i8 addrspace(13)*>, <2 x i8 addrspace(13)*> addrspace(11)* %arrayptrptr, align 16
+   %arrayptr = extractelement <2 x i8 addrspace(13)*> %arrayptrs, i32 0
+   call void @jl_safepoint()
+   %val = load i8, i8 addrspace(13)* %arrayptr
+   ret i8 %val
+}
+
+declare <2 x i8 addrspace(13)*> @llvm.masked.load.v2p13i8.p11v2p13i8 (<2 x i8 addrspace(13)*> addrspace(11)*, i32, <2 x i1>, <2 x i8 addrspace(13)*>)
+
+define i8 @masked_arrayptrs() {
+; CHECK-LABEL: @masked_arrayptrs
+; CHECK: %gcframe = alloca %jl_value_t addrspace(10)*, i32 3
+; CHECK: %arrayptrs = call <2 x i8 addrspace(13)*> @llvm.masked.load.v2p13i8.p11v2p13i8(<2 x i8 addrspace(13)*> addrspace(11)* %arrayptrptr, i32 16, <2 x i1> <i1 true, i1 false>, <2 x i8 addrspace(13)*> zeroinitializer)
+; CHECK: [[GEP0:%.*]] = getelementptr %jl_value_t addrspace(10)*, %jl_value_t addrspace(10)** %gcframe, i32 2
+; CHECK: store %jl_value_t addrspace(10)* %obj1, %jl_value_t addrspace(10)** [[GEP0]]
+;
+top:
+   %ptls = call %jl_value_t*** @julia.ptls_states()
+   %obj1 = call %jl_value_t addrspace(10) *@alloc()
+   %decayed = addrspacecast %jl_value_t addrspace(10) *%obj1 to %jl_value_t addrspace(11) *
+   %arrayptrptr = bitcast %jl_value_t addrspace(11) *%decayed to <2 x i8 addrspace(13)*> addrspace(11)*
+   %arrayptrs = call <2 x i8 addrspace(13)*> @llvm.masked.load.v2p13i8.p11v2p13i8(<2 x i8 addrspace(13)*> addrspace(11)* %arrayptrptr, i32 16, <2 x i1> <i1 true, i1 false>, <2 x i8 addrspace(13)*> undef)
+   %arrayptr = extractelement <2 x i8 addrspace(13)*> %arrayptrs, i32 0
+   call void @jl_safepoint()
+   %val = load i8, i8 addrspace(13)* %arrayptr
+   ret i8 %val
+}
+
+declare <2 x i8 addrspace(13)*> @llvm.masked.gather.v2p13i8.v2p11p13i8 (<2 x i8 addrspace(13)* addrspace(11)*>, i32, <2 x i1>, <2 x i8 addrspace(13)*>)
+
+define i8 @gather_arrayptrs() {
+; CHECK-LABEL: @gather_arrayptrs
+; CHECK: %gcframe = alloca %jl_value_t addrspace(10)*, i32 3
+; CHECK: %arrayptrs = call <2 x i8 addrspace(13)*> @llvm.masked.gather.v2p13i8.v2p11p13i8(<2 x i8 addrspace(13)* addrspace(11)*> %arrayptrptrs, i32 16, <2 x i1> <i1 true, i1 false>, <2 x i8 addrspace(13)*> zeroinitializer)
+; CHECK: [[GEP0:%.*]] = getelementptr %jl_value_t addrspace(10)*, %jl_value_t addrspace(10)** %gcframe, i32 2
+; CHECK: store %jl_value_t addrspace(10)* %obj1, %jl_value_t addrspace(10)** [[GEP0]]
+;
+top:
+   %ptls = call %jl_value_t*** @julia.ptls_states()
+   %obj1 = call %jl_value_t addrspace(10) *@alloc()
+   %decayed = addrspacecast %jl_value_t addrspace(10) *%obj1 to %jl_value_t addrspace(11)*
+   %arrayptrptr = bitcast %jl_value_t addrspace(11) *%decayed to i8 addrspace(13)* addrspace(11)*
+   %arrayptrptrs = insertelement <2 x i8 addrspace(13)* addrspace(11)*> zeroinitializer, i8 addrspace(13)* addrspace(11)* %arrayptrptr, i32 0
+   %arrayptrs = call <2 x i8 addrspace(13)*> @llvm.masked.gather.v2p13i8.v2p11p13i8(<2 x i8 addrspace(13)* addrspace(11)*> %arrayptrptrs, i32 16, <2 x i1> <i1 true, i1 false>, <2 x i8 addrspace(13)*> undef)
+   %arrayptr = extractelement <2 x i8 addrspace(13)*> %arrayptrs, i32 0
+   call void @jl_safepoint()
+   %val = load i8, i8 addrspace(13)* %arrayptr
+   ret i8 %val
+}
+
 !0 = !{!"jtbaa"}
 !1 = !{!"jtbaa_const", !0, i64 0}
 !2 = !{!1, !1, i64 0, i64 1}
diff --git a/test/logging.jl b/test/logging.jl
index 3bb8f083e4436..f8530ff235771 100644
--- a/test/logging.jl
+++ b/test/logging.jl
@@ -384,4 +384,12 @@ end
     @test logs[1].id != logs[2].id
 end
 
+# Issue #34485
+@testset "`_group` must be a `Symbol`" begin
+    (record,), _ = collect_test_logs() do
+        @info "test"
+    end
+    @test record.group == :logging  # name of this file
+end
+
 end
diff --git a/test/math.jl b/test/math.jl
index 4515f8ca7b862..f807de380047e 100644
--- a/test/math.jl
+++ b/test/math.jl
@@ -1030,10 +1030,15 @@ end
     end
 end
 
-isdefined(Main, :Furlongs) || @eval Main include("testhelpers/Furlongs.jl")
-using .Main.Furlongs
-@test hypot(Furlong(0), Furlong(0)) == Furlong(0.0)
-@test hypot(Furlong(3), Furlong(4)) == Furlong(5.0)
-@test hypot(Furlong(NaN), Furlong(Inf)) == Furlong(Inf)
-@test hypot(Furlong(Inf), Furlong(NaN)) == Furlong(Inf)
-@test hypot(Furlong(Inf), Furlong(Inf)) == Furlong(Inf)
+@testset "hypot" begin
+    @test hypot(0, 0) == 0.0
+    @test hypot(3, 4) == 5.0
+    @test hypot(NaN, Inf) == Inf
+    @test hypot(Inf, NaN) == Inf
+    @test hypot(Inf, Inf) == Inf
+
+    isdefined(Main, :Furlongs) || @eval Main include("testhelpers/Furlongs.jl")
+    using .Main.Furlongs
+    @test hypot(Furlong(0), Furlong(0)) == Furlong(0.0)
+    @test hypot(Furlong(3), Furlong(4)) == Furlong(5.0)
+end
diff --git a/test/offsetarray.jl b/test/offsetarray.jl
index bb25424d6855e..e7b4fb9410018 100644
--- a/test/offsetarray.jl
+++ b/test/offsetarray.jl
@@ -440,6 +440,14 @@ I = findall(!iszero, z)
 @test std(A_3_3, dims=2) == OffsetArray(reshape([3,3,3], (3,1)), A_3_3.offsets)
 @test sum(OffsetArray(fill(1,3000), -1000)) == 3000
 
+# https://github.com/JuliaArrays/OffsetArrays.jl/issues/92
+A92 = OffsetArray(reshape(1:27, 3, 3, 3), -2, -2, -2)
+B92 = view(A92, :, :, -1:0)
+@test axes(B92) == (-1:1, -1:1, 1:2)
+@test sum(B92, dims=(2,3)) == OffsetArray(reshape([51,57,63], Val(3)), -2, -2, 0)
+B92 = view(A92, :, :, Base.IdentityUnitRange(-1:0))
+@test sum(B92, dims=(2,3)) == OffsetArray(reshape([51,57,63], Val(3)), -2, -2, -2)
+
 @test norm(v) ≈ norm(parent(v))
 @test norm(A) ≈ norm(parent(A))
 @test dot(v, v) ≈ dot(v0, v0)
diff --git a/test/precompile.jl b/test/precompile.jl
index f85704b393aa6..fcedee3098e87 100644
--- a/test/precompile.jl
+++ b/test/precompile.jl
@@ -797,4 +797,27 @@ let
     end
 end
 
+# Issue #25971
+let
+    load_path = mktempdir()
+    load_cache_path = mktempdir()
+    try
+        pushfirst!(LOAD_PATH, load_path)
+        pushfirst!(DEPOT_PATH, load_cache_path)
+        sourcefile = joinpath(load_path, "Foo25971.jl")
+        write(sourcefile, "module Foo25971 end")
+        chmod(sourcefile, 0o666)
+        cachefile = Base.compilecache(Base.PkgId("Foo25971"))
+        @test filemode(sourcefile) == filemode(cachefile)
+        chmod(sourcefile, 0o600)
+        cachefile = Base.compilecache(Base.PkgId("Foo25971"))
+        @test filemode(sourcefile) == filemode(cachefile)
+    finally
+        rm(load_path, recursive=true)
+        rm(load_cache_path, recursive=true)
+        filter!((≠)(load_path), LOAD_PATH)
+        filter!((≠)(load_cache_path), DEPOT_PATH)
+    end
+end
+
 end # !withenv
diff --git a/test/show.jl b/test/show.jl
index e89f745454398..5a243bd9556a7 100644
--- a/test/show.jl
+++ b/test/show.jl
@@ -1445,6 +1445,11 @@ end
         "2-element Array{Any,1}:\n Pair{Integer,Int64}(1, 2)\n Pair{Integer,Int64}(33, 4)"
 end
 
+@testset "alignment for complex arrays" begin # (#34763)
+    @test replstr([ 1e-7 + 2.0e-11im, 2.0e-5 + 4e0im]) == "2-element Array{Complex{Float64},1}:\n 1.0e-7 + 2.0e-11im\n 2.0e-5 + 4.0im"
+    @test replstr([ 1f-7 + 2.0f-11im, 2.0f-5 + 4f0im]) == "2-element Array{Complex{Float32},1}:\n 1.0f-7 + 2.0f-11im\n 2.0f-5 + 4.0f0im"
+end
+
 @testset "display arrays non-compactly when size(⋅, 2) == 1" begin
     # 0-dim
     @test replstr(zeros(Complex{Int})) == "0-dimensional Array{Complex{$Int},0}:\n0 + 0im"
@@ -1992,3 +1997,5 @@ end
 @weak_test_repr "a[begin, end, let x=1; (x+1;); end]"
 @test repr(Base.remove_linenums!(:(a[begin, end, let x=1; (x+1;); end]))) ==
         ":(a[begin, end, let x = 1\n          begin\n              x + 1\n          end\n      end])"
+@test_repr "a[(bla;)]"
+@weak_test_repr "a[x -> f(x)]"
diff --git a/test/testhelpers/Furlongs.jl b/test/testhelpers/Furlongs.jl
index 3c2f7a035e91c..98525d5d67dbc 100644
--- a/test/testhelpers/Furlongs.jl
+++ b/test/testhelpers/Furlongs.jl
@@ -45,8 +45,8 @@ for f in (:real,:imag,:complex,:+,:-)
     @eval Base.$f(x::Furlong{p}) where {p} = Furlong{p}($f(x.val))
 end
 
-import Base: +, -, ==, !=, <, <=, isless, isequal, *, /, //, div, rem, mod, ^, hypot
-for op in (:+, :-, :hypot)
+import Base: +, -, ==, !=, <, <=, isless, isequal, *, /, //, div, rem, mod, ^
+for op in (:+, :-)
     @eval function $op(x::Furlong{p}, y::Furlong{p}) where {p}
         v = $op(x.val, y.val)
         Furlong{p}(v)
diff --git a/test/threads.jl b/test/threads.jl
index 54e11c8df3f19..c555363cf9d62 100644
--- a/test/threads.jl
+++ b/test/threads.jl
@@ -20,3 +20,120 @@ if Sys.islinux() && Sys.CPU_THREADS > 1 && Sys.which("taskset") !== nothing
     @test endswith(run_with_affinity("1"), "2")
     @test endswith(run_with_affinity("0,1"), "3")
 end
+
+# issue #34769
+function idle_callback(handle)
+    idle = @Base.handle_as handle UvTestIdle
+    if idle.active
+        idle.count += 1
+        if idle.count == 1
+            # We want to hit the case where we're allowing
+            # the thread to go to sleep, which only happens
+            # after some default amount of time (DEFAULT_THREAD_SLEEP_THRESHOLD)
+            # so spend that amount of time here.
+            Libc.systemsleep(0.004)
+        elseif idle.count >= 10
+            lock(idle.cond)
+            try
+                notify(idle.cond, true)
+            finally
+                unlock(idle.cond)
+            end
+            idle.active = false
+        end
+    end
+    nothing
+end
+
+mutable struct UvTestIdle
+    handle::Ptr{Cvoid}
+    cond::Base.ThreadSynchronizer
+    isopen::Bool
+    active::Bool
+    count::Int
+
+    function UvTestIdle()
+        this = new(Libc.malloc(Base._sizeof_uv_idle), Base.ThreadSynchronizer(), true, false, 0)
+        Base.iolock_begin()
+        Base.associate_julia_struct(this.handle, this)
+        err = ccall(:uv_idle_init, Cint, (Ptr{Cvoid}, Ptr{Cvoid}),
+            Base.eventloop(), this.handle)
+        if err != 0
+            Libc.free(this.handle)
+            this.handle = C_NULL
+            throw(_UVError("uv_idle_init", err))
+        end
+        err = ccall(:uv_idle_start, Cint, (Ptr{Cvoid}, Ptr{Cvoid}),
+            this.handle, @cfunction(idle_callback, Cvoid, (Ptr{Cvoid},)))
+        if err != 0
+            Libc.free(this.handle)
+            this.handle = C_NULL
+            throw(_UVError("uv_idle_start", err))
+        end
+        finalizer(Base.uvfinalize, this)
+        Base.iolock_end()
+        return this
+    end
+end
+Base.unsafe_convert(::Type{Ptr{Cvoid}}, idle::UvTestIdle) = idle.handle
+
+function Base.uvfinalize(t::UvTestIdle)
+    Base.iolock_begin()
+    Base.lock(t.cond)
+    try
+        if t.handle != C_NULL
+            Base.disassociate_julia_struct(t.handle) # not going to call the usual close hooks
+            if t.isopen
+                t.isopen = false
+                ccall(:jl_close_uv, Cvoid, (Ptr{Cvoid},), t)
+            end
+            t.handle = C_NULL
+            notify(t.cond, false)
+        end
+    finally
+        unlock(t.cond)
+    end
+    Base.iolock_end()
+    nothing
+end
+
+function Base.wait(idle::UvTestIdle)
+    Base.iolock_begin()
+    Base.preserve_handle(idle)
+    Base.lock(idle.cond)
+    try
+        idle.active = true
+        wait(idle.cond)
+    finally
+        Base.unlock(idle.cond)
+        Base.unpreserve_handle(idle)
+        Base.iolock_end()
+    end
+end
+
+# Spawn another process as a watchdog. If this test fails, it'll unrecoverably
+# hang in the event loop. Another process needs to kill it
+cmd = """
+    @async (Base.wait_readnb(stdin, 1); exit())
+    sleep(100)
+    isopen(stdin) || exit()
+    println(stderr, "ERROR: Killing threads test due to watchdog expiry")
+    ccall(:uv_kill, Cint, (Cint, Cint), $(getpid()), Base.SIGTERM)
+"""
+proc = open(pipeline(`$(Base.julia_cmd()) -e $cmd`; stderr=stderr); write=true)
+
+let idle=UvTestIdle()
+    wait(idle)
+end
+
+using Base.Threads
+@threads for i = 1:1
+    let idle=UvTestIdle()
+        wait(idle)
+    end
+end
+
+@test process_running(proc)
+
+# We don't need the watchdog anymore
+close(proc.in)
diff --git a/test/vecelement.jl b/test/vecelement.jl
index 077f608d59e03..5652ea10d3aa6 100644
--- a/test/vecelement.jl
+++ b/test/vecelement.jl
@@ -3,7 +3,7 @@
 make_value(::Type{T}, i::Integer) where {T<:Integer} = 3*i%T
 make_value(::Type{T},i::Integer) where {T<:AbstractFloat} = T(3*i)
 
-Vec{N,T} = NTuple{N,Base.VecElement{T}}
+const Vec{N,T} = NTuple{N,Base.VecElement{T}}
 
 # Crash report for #15244 motivated this test.
 @generated function thrice_iota(::Type{Vec{N,T}}) where {N,T}
@@ -73,6 +73,13 @@ end
 
 @test isa(VecElement((1,2)), VecElement{Tuple{Int,Int}})
 
+# test for alignment agreement (#32414)
+@noinline function bar32414(a)
+    v = ntuple(w -> VecElement(Float64(10w)), Val(8))
+    return a, (v, (a, (1e6, 1e9)))
+end
+@test bar32414(-35.0) === (-35.0, ((VecElement(10.0), VecElement(20.0), VecElement(30.0), VecElement(40.0), VecElement(50.0), VecElement(60.0), VecElement(70.0), VecElement(80.0)), (-35.0, (1.0e6, 1.0e9))))
+
 # The following test mimic SIMD.jl
 const _llvmtypes = Dict{DataType, String}(
     Float64 => "double",
@@ -105,14 +112,8 @@ end
 # Test various SIMD Vectors with known good sizes
 for T in (Float64, Float32, Int64, Int32)
     for N in 1:36
-        # For some vectortypes Julia emits llvm arrays instead of vectors
-        if N %  7 == 0 || N % 11 == 0 || N % 13 == 0 || N % 15 == 0 ||
-           N % 19 == 0 || N % 23 == 0 || N % 25 == 0 || N % 27 == 0 ||
-           N % 29 == 0 || N % 31 == 0
-            continue
-        end
-        a = ntuple(i->VecElement(T(i)), N)
-        result = ntuple(i-> VecElement(T(i+i)), N)
+        a = ntuple(i -> VecElement(T(i)), N)
+        result = ntuple(i -> VecElement(T(i+i)), N)
         b = vecadd(a, a)
         @test b == result
         b = f20961([a], [a])