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Update the minimum external LLVM to 13 #100460

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Aug 16, 2022
Merged

Update the minimum external LLVM to 13 #100460

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6 changes: 3 additions & 3 deletions .github/workflows/ci.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -43,7 +43,7 @@ jobs:
- name: mingw-check
os: ubuntu-20.04-xl
env: {}
- name: x86_64-gnu-llvm-12
- name: x86_64-gnu-llvm-13
os: ubuntu-20.04-xl
env: {}
- name: x86_64-gnu-tools
Expand Down Expand Up @@ -274,11 +274,11 @@ jobs:
- name: x86_64-gnu-distcheck
os: ubuntu-20.04-xl
env: {}
- name: x86_64-gnu-llvm-12
- name: x86_64-gnu-llvm-13
env:
RUST_BACKTRACE: 1
os: ubuntu-20.04-xl
- name: x86_64-gnu-llvm-12-stage1
- name: x86_64-gnu-llvm-13-stage1
env:
RUST_BACKTRACE: 1
os: ubuntu-20.04-xl
Expand Down
8 changes: 0 additions & 8 deletions compiler/rustc_codegen_llvm/src/asm.rs
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Expand Up @@ -3,7 +3,6 @@ use crate::builder::Builder;
use crate::common::Funclet;
use crate::context::CodegenCx;
use crate::llvm;
use crate::llvm_util;
use crate::type_::Type;
use crate::type_of::LayoutLlvmExt;
use crate::value::Value;
Expand Down Expand Up @@ -419,13 +418,6 @@ pub(crate) fn inline_asm_call<'ll>(
let constraints_ok = llvm::LLVMRustInlineAsmVerify(fty, cons.as_ptr().cast(), cons.len());
debug!("constraint verification result: {:?}", constraints_ok);
if constraints_ok {
if unwind && llvm_util::get_version() < (13, 0, 0) {
bx.cx.sess().span_fatal(
line_spans[0],
"unwinding from inline assembly is only supported on llvm >= 13.",
);
}

let v = llvm::LLVMRustInlineAsm(
fty,
asm.as_ptr().cast(),
Expand Down
15 changes: 1 addition & 14 deletions compiler/rustc_codegen_llvm/src/back/write.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -5,7 +5,7 @@ use crate::back::profiling::{
use crate::base;
use crate::common;
use crate::consts;
use crate::llvm::{self, DiagnosticInfo, PassManager, SMDiagnostic};
use crate::llvm::{self, DiagnosticInfo, PassManager};
use crate::llvm_util;
use crate::type_::Type;
use crate::LlvmCodegenBackend;
Expand Down Expand Up @@ -304,17 +304,14 @@ impl<'a> DiagnosticHandlers<'a> {
remark_passes.as_ptr(),
remark_passes.len(),
);
llvm::LLVMRustSetInlineAsmDiagnosticHandler(llcx, inline_asm_handler, data.cast());
DiagnosticHandlers { data, llcx, old_handler }
}
}
}

impl<'a> Drop for DiagnosticHandlers<'a> {
fn drop(&mut self) {
use std::ptr::null_mut;
unsafe {
llvm::LLVMRustSetInlineAsmDiagnosticHandler(self.llcx, inline_asm_handler, null_mut());
llvm::LLVMRustContextSetDiagnosticHandler(self.llcx, self.old_handler);
drop(Box::from_raw(self.data));
}
Expand Down Expand Up @@ -342,16 +339,6 @@ fn report_inline_asm(
cgcx.diag_emitter.inline_asm_error(cookie as u32, msg, level, source);
}

unsafe extern "C" fn inline_asm_handler(diag: &SMDiagnostic, user: *const c_void, cookie: c_uint) {
if user.is_null() {
return;
}
let (cgcx, _) = *(user as *const (&CodegenContext<LlvmCodegenBackend>, &Handler));

let smdiag = llvm::diagnostic::SrcMgrDiagnostic::unpack(diag);
report_inline_asm(cgcx, smdiag.message, smdiag.level, cookie, smdiag.source);
}

unsafe extern "C" fn diagnostic_handler(info: &DiagnosticInfo, user: *mut c_void) {
if user.is_null() {
return;
Expand Down
79 changes: 25 additions & 54 deletions compiler/rustc_codegen_llvm/src/builder.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -3,7 +3,6 @@ use crate::common::Funclet;
use crate::context::CodegenCx;
use crate::llvm::{self, BasicBlock, False};
use crate::llvm::{AtomicOrdering, AtomicRmwBinOp, SynchronizationScope};
use crate::llvm_util;
use crate::type_::Type;
use crate::type_of::LayoutLlvmExt;
use crate::value::Value;
Expand Down Expand Up @@ -1038,25 +1037,11 @@ impl<'a, 'll, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'll, 'tcx> {
dst: &'ll Value,
cmp: &'ll Value,
src: &'ll Value,
mut order: rustc_codegen_ssa::common::AtomicOrdering,
order: rustc_codegen_ssa::common::AtomicOrdering,
failure_order: rustc_codegen_ssa::common::AtomicOrdering,
weak: bool,
) -> &'ll Value {
let weak = if weak { llvm::True } else { llvm::False };
if llvm_util::get_version() < (13, 0, 0) {
use rustc_codegen_ssa::common::AtomicOrdering::*;
// Older llvm has the pre-C++17 restriction on
// success and failure memory ordering,
// requiring the former to be at least as strong as the latter.
// So, for llvm 12, we upgrade the success ordering to a stronger
// one if necessary.
match (order, failure_order) {
(Relaxed, Acquire) => order = Acquire,
(Release, Acquire) => order = AcquireRelease,
(_, SequentiallyConsistent) => order = SequentiallyConsistent,
_ => {}
}
}
unsafe {
llvm::LLVMRustBuildAtomicCmpXchg(
self.llbuilder,
Expand Down Expand Up @@ -1444,51 +1429,37 @@ impl<'a, 'll, 'tcx> Builder<'a, 'll, 'tcx> {
}
}

fn fptoint_sat_broken_in_llvm(&self) -> bool {
match self.tcx.sess.target.arch.as_ref() {
// FIXME - https://bugs.llvm.org/show_bug.cgi?id=50083
"riscv64" => llvm_util::get_version() < (13, 0, 0),
_ => false,
}
}

fn fptoint_sat(
&mut self,
signed: bool,
val: &'ll Value,
dest_ty: &'ll Type,
) -> Option<&'ll Value> {
if !self.fptoint_sat_broken_in_llvm() {
let src_ty = self.cx.val_ty(val);
let (float_ty, int_ty, vector_length) = if self.cx.type_kind(src_ty) == TypeKind::Vector
{
assert_eq!(self.cx.vector_length(src_ty), self.cx.vector_length(dest_ty));
(
self.cx.element_type(src_ty),
self.cx.element_type(dest_ty),
Some(self.cx.vector_length(src_ty)),
)
} else {
(src_ty, dest_ty, None)
};
let float_width = self.cx.float_width(float_ty);
let int_width = self.cx.int_width(int_ty);

let instr = if signed { "fptosi" } else { "fptoui" };
let name = if let Some(vector_length) = vector_length {
format!(
"llvm.{}.sat.v{}i{}.v{}f{}",
instr, vector_length, int_width, vector_length, float_width
)
} else {
format!("llvm.{}.sat.i{}.f{}", instr, int_width, float_width)
};
let f =
self.declare_cfn(&name, llvm::UnnamedAddr::No, self.type_func(&[src_ty], dest_ty));
Some(self.call(self.type_func(&[src_ty], dest_ty), f, &[val], None))
let src_ty = self.cx.val_ty(val);
let (float_ty, int_ty, vector_length) = if self.cx.type_kind(src_ty) == TypeKind::Vector {
assert_eq!(self.cx.vector_length(src_ty), self.cx.vector_length(dest_ty));
(
self.cx.element_type(src_ty),
self.cx.element_type(dest_ty),
Some(self.cx.vector_length(src_ty)),
)
} else {
None
}
(src_ty, dest_ty, None)
};
let float_width = self.cx.float_width(float_ty);
let int_width = self.cx.int_width(int_ty);

let instr = if signed { "fptosi" } else { "fptoui" };
let name = if let Some(vector_length) = vector_length {
format!(
"llvm.{}.sat.v{}i{}.v{}f{}",
instr, vector_length, int_width, vector_length, float_width
)
} else {
format!("llvm.{}.sat.i{}.f{}", instr, int_width, float_width)
};
let f = self.declare_cfn(&name, llvm::UnnamedAddr::No, self.type_func(&[src_ty], dest_ty));
Some(self.call(self.type_func(&[src_ty], dest_ty), f, &[val], None))
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Does this always return Some now?

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For LLVM, yes, and that's passed directly back through BuilderMethods::fptoui_sat/fptosi_sat. But the GCC version of those methods still returns None. So I guess the fallback in cg_ssa will only be used by GCC, and maybe that could be pushed down into something GCC-specific.

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See #100653.

}

pub(crate) fn landing_pad(
Expand Down
11 changes: 0 additions & 11 deletions compiler/rustc_codegen_llvm/src/context.rs
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Expand Up @@ -142,17 +142,6 @@ pub unsafe fn create_module<'ll>(

let mut target_data_layout = sess.target.data_layout.to_string();
let llvm_version = llvm_util::get_version();
if llvm_version < (13, 0, 0) {
if sess.target.arch == "powerpc64" {
target_data_layout = target_data_layout.replace("-S128", "");
}
if sess.target.arch == "wasm32" {
target_data_layout = "e-m:e-p:32:32-i64:64-n32:64-S128".to_string();
}
if sess.target.arch == "wasm64" {
target_data_layout = "e-m:e-p:64:64-i64:64-n32:64-S128".to_string();
}
}
if llvm_version < (14, 0, 0) {
if sess.target.llvm_target == "i686-pc-windows-msvc"
|| sess.target.llvm_target == "i586-pc-windows-msvc"
Expand Down
6 changes: 0 additions & 6 deletions compiler/rustc_codegen_llvm/src/llvm/ffi.rs
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Expand Up @@ -2410,12 +2410,6 @@ extern "C" {
cookie_out: &mut c_uint,
) -> &'a SMDiagnostic;

pub fn LLVMRustSetInlineAsmDiagnosticHandler(
C: &Context,
H: InlineAsmDiagHandlerTy,
CX: *mut c_void,
);

#[allow(improper_ctypes)]
pub fn LLVMRustUnpackSMDiagnostic(
d: &SMDiagnostic,
Expand Down
10 changes: 0 additions & 10 deletions compiler/rustc_codegen_llvm/src/llvm_util.rs
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Expand Up @@ -92,16 +92,6 @@ unsafe fn configure_llvm(sess: &Session) {
add("-generate-arange-section", false);
}

// Disable the machine outliner by default in LLVM versions 11 and LLVM
// version 12, where it leads to miscompilation.
//
// Ref:
// - https://github.com/rust-lang/rust/issues/85351
// - https://reviews.llvm.org/D103167
if llvm_util::get_version() < (13, 0, 0) {
add("-enable-machine-outliner=never", false);
}

match sess.opts.unstable_opts.merge_functions.unwrap_or(sess.target.merge_functions) {
MergeFunctions::Disabled | MergeFunctions::Trampolines => {}
MergeFunctions::Aliases => {
Expand Down
11 changes: 0 additions & 11 deletions compiler/rustc_llvm/llvm-wrapper/CoverageMappingWrapper.cpp
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Expand Up @@ -24,17 +24,10 @@ extern "C" void LLVMRustCoverageWriteFilenamesSectionToBuffer(
const char* const Filenames[],
size_t FilenamesLen,
RustStringRef BufferOut) {
#if LLVM_VERSION_GE(13,0)
SmallVector<std::string,32> FilenameRefs;
for (size_t i = 0; i < FilenamesLen; i++) {
FilenameRefs.push_back(std::string(Filenames[i]));
}
#else
SmallVector<StringRef,32> FilenameRefs;
for (size_t i = 0; i < FilenamesLen; i++) {
FilenameRefs.push_back(StringRef(Filenames[i]));
}
#endif
auto FilenamesWriter = coverage::CoverageFilenamesSectionWriter(
makeArrayRef(FilenameRefs));
RawRustStringOstream OS(BufferOut);
Expand Down Expand Up @@ -109,9 +102,5 @@ extern "C" void LLVMRustCoverageWriteMappingVarNameToString(RustStringRef Str) {
}

extern "C" uint32_t LLVMRustCoverageMappingVersion() {
#if LLVM_VERSION_GE(13, 0)
return coverage::CovMapVersion::Version6;
#else
return coverage::CovMapVersion::Version5;
#endif
}
18 changes: 1 addition & 17 deletions compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp
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Expand Up @@ -869,19 +869,11 @@ LLVMRustOptimizeWithNewPassManager(
PGOOptions::NoCSAction, DebugInfoForProfiling);
}

#if LLVM_VERSION_GE(13, 0)
PassBuilder PB(TM, PTO, PGOOpt, &PIC);
LoopAnalysisManager LAM;
FunctionAnalysisManager FAM;
CGSCCAnalysisManager CGAM;
ModuleAnalysisManager MAM;
#else
PassBuilder PB(DebugPassManager, TM, PTO, PGOOpt, &PIC);
LoopAnalysisManager LAM(DebugPassManager);
FunctionAnalysisManager FAM(DebugPassManager);
CGSCCAnalysisManager CGAM(DebugPassManager);
ModuleAnalysisManager MAM(DebugPassManager);
#endif

FAM.registerPass([&] { return PB.buildDefaultAAPipeline(); });

Expand Down Expand Up @@ -1015,11 +1007,7 @@ LLVMRustOptimizeWithNewPassManager(
}
}

#if LLVM_VERSION_GE(13, 0)
ModulePassManager MPM;
#else
ModulePassManager MPM(DebugPassManager);
#endif
bool NeedThinLTOBufferPasses = UseThinLTOBuffers;
if (!NoPrepopulatePasses) {
// The pre-link pipelines don't support O0 and require using budilO0DefaultPipeline() instead.
Expand Down Expand Up @@ -1434,17 +1422,13 @@ LLVMRustCreateThinLTOData(LLVMRustThinLTOModule *modules,
Ret->ResolvedODR[ModuleIdentifier][GUID] = NewLinkage;
};

#if LLVM_VERSION_GE(13,0)
// Uses FromPrevailing visibility scheme which works for many binary
// formats. We probably could and should use ELF visibility scheme for many of
// our targets, however.
lto::Config conf;
thinLTOResolvePrevailingInIndex(conf, Ret->Index, isPrevailing, recordNewLinkage,
Ret->GUIDPreservedSymbols);
#else
thinLTOResolvePrevailingInIndex(Ret->Index, isPrevailing, recordNewLinkage,
Ret->GUIDPreservedSymbols);
#endif

// Here we calculate an `ExportedGUIDs` set for use in the `isExported`
// callback below. This callback below will dictate the linkage for all
// summaries in the index, and we basically just only want to ensure that dead
Expand Down
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