no method matching add_constant!(::LoopSet, ::Val{2}, ::Int)

[baggepinnen]

The presence of @fastmath here appears to cause a problem. In practice I can of course remove fastmath, but opening the issue just in case

function f3(x::Vector{T},t) where T
    @turbo for i = 1:length(x)
        xv = x[i]
        @fastmath x[i] = 1/(xv^2) 
    end
    x
end

LoadError: MethodError: no method matching add_constant!(::LoopVectorization.LoopSet, ::Val{2}, ::Int64)
Closest candidates are:
  add_constant!(::LoopVectorization.LoopSet, ::Number, ::Int64) at ~/.julia/packages/LoopVectorization/lCUVJ/src/parse/add_constants.jl:37
  add_constant!(::LoopVectorization.LoopSet, ::Number, ::Int64, ::Any) at ~/.julia/packages/LoopVectorization/lCUVJ/src/parse/add_constants.jl:37
  add_constant!(::LoopVectorization.LoopSet, ::Symbol, ::Int64) at ~/.julia/packages/LoopVectorization/lCUVJ/src/parse/add_constants.jl:14
  ...
Stacktrace:
  [1] add_parent!(vparents::Vector{LoopVectorization.Operation}, deps::Vector{Symbol}, reduceddeps::Vector{Symbol}, ls::LoopVectorization.LoopSet, var::Val{2}, elementbytes::Int64, position::Int64)
    @ LoopVectorization ~/.julia/packages/LoopVectorization/lCUVJ/src/parse/add_compute.jl:94
  [2] add_compute!(ls::LoopVectorization.LoopSet, var::Symbol, ex::Expr, elementbytes::Int64, position::Int64, mpref::Nothing)
    @ LoopVectorization ~/.julia/packages/LoopVectorization/lCUVJ/src/parse/add_compute.jl:498
  [3] add_compute!(ls::LoopVectorization.LoopSet, var::Symbol, ex::Expr, elementbytes::Int64, position::Int64)
    @ LoopVectorization ~/.julia/packages/LoopVectorization/lCUVJ/src/parse/add_compute.jl:454
  [4] add_operation!(ls::LoopVectorization.LoopSet, LHS::Symbol, RHS::Expr, elementbytes::Int64, position::Int64)
    @ LoopVectorization ~/.julia/packages/LoopVectorization/lCUVJ/src/modeling/graphs.jl:1409
  [5] add_parent!(vparents::Vector{LoopVectorization.Operation}, deps::Vector{Symbol}, reduceddeps::Vector{Symbol}, ls::LoopVectorization.LoopSet, var::Expr, elementbytes::Int64, position::Int64)
    @ LoopVectorization ~/.julia/packages/LoopVectorization/lCUVJ/src/parse/add_compute.jl:92
  [6] add_compute!(ls::LoopVectorization.LoopSet, var::Symbol, ex::Expr, elementbytes::Int64, position::Int64, mpref::LoopVectorization.ArrayReferenceMetaPosition)
    @ LoopVectorization ~/.julia/packages/LoopVectorization/lCUVJ/src/parse/add_compute.jl:492
  [7] add_operation!(ls::LoopVectorization.LoopSet, LHS_sym::Symbol, RHS::Expr, LHS_ref::LoopVectorization.ArrayReferenceMetaPosition, elementbytes::Int64, position::Int64)
    @ LoopVectorization ~/.julia/packages/LoopVectorization/lCUVJ/src/modeling/graphs.jl:1467
  [8] prepare_rhs_for_storage!(ls::LoopVectorization.LoopSet, RHS::Expr, array::Symbol, rawindices::SubArray{Any, 1, Vector{Any}, Tuple{UnitRange{Int64}}, true}, elementbytes::Int64, position::Int64)
    @ LoopVectorization ~/.julia/packages/LoopVectorization/lCUVJ/src/modeling/graphs.jl:1500
  [9] add_assignment!(ls::LoopVectorization.LoopSet, LHS::Expr, RHS::Expr, elementbytes::Int64, position::Int64)
    @ LoopVectorization ~/.julia/packages/LoopVectorization/lCUVJ/src/modeling/graphs.jl:1585
 [10] push!(ls::LoopVectorization.LoopSet, ex::Expr, elementbytes::Int64, position::Int64, mpref::Nothing)
    @ LoopVectorization ~/.julia/packages/LoopVectorization/lCUVJ/src/modeling/graphs.jl:1627
 [11] push!(ls::LoopVectorization.LoopSet, ex::Expr, elementbytes::Int64, position::Int64)
    @ LoopVectorization ~/.julia/packages/LoopVectorization/lCUVJ/src/modeling/graphs.jl:1611
 [12] add_block!
    @ ~/.julia/packages/LoopVectorization/lCUVJ/src/modeling/graphs.jl:921 [inlined]
 [13] add_loop!(ls::LoopVectorization.LoopSet, q::Expr, elementbytes::Int64)
    @ LoopVectorization ~/.julia/packages/LoopVectorization/lCUVJ/src/modeling/graphs.jl:1258
 [14] copyto!
    @ ~/.julia/packages/LoopVectorization/lCUVJ/src/constructors.jl:15 [inlined]
 [15] LoopVectorization.LoopSet(q::Expr, mod::Symbol)
    @ LoopVectorization ~/.julia/packages/LoopVectorization/lCUVJ/src/constructors.jl:84
 [16] LoopVectorization.LoopSet(q::Expr, m::Module)
    @ LoopVectorization ~/.julia/packages/LoopVectorization/lCUVJ/src/constructors.jl:88
 [17] turbo_macro(::Module, ::LineNumberNode, ::Expr)
    @ LoopVectorization ~/.julia/packages/LoopVectorization/lCUVJ/src/constructors.jl:227
 [18] var"@turbo"(__source__::LineNumberNode, __module__::Module, args::Vararg{Any})
    @ LoopVectorization ~/.julia/packages/LoopVectorization/lCUVJ/src/constructors.jl:330
 [19] eval
    @ ./boot.jl:368 [inlined]
 [20] include_string(mapexpr::typeof(REPL.softscope), mod::Module, code::String, filename::String)
    @ Base ./loading.jl:1428
 [21] invokelatest(::Any, ::Any, ::Vararg{Any}; kwargs::Base.Pairs{Symbol, Union{}, Tuple{}, NamedTuple{(), Tuple{}}})
    @ Base ./essentials.jl:729
 [22] invokelatest(::Any, ::Any, ::Vararg{Any})
    @ Base ./essentials.jl:726
 [23] inlineeval(m::Module, code::String, code_line::Int64, code_column::Int64, file::String; softscope::Bool)
    @ VSCodeServer ~/.vscode/extensions/julialang.language-julia-1.7.12/scripts/packages/VSCodeServer/src/eval.jl:233
 [24] (::VSCodeServer.var"#66#70"{Bool, Bool, Bool, Module, String, Int64, Int64, String, VSCodeServer.ReplRunCodeRequestParams})()
    @ VSCodeServer ~/.vscode/extensions/julialang.language-julia-1.7.12/scripts/packages/VSCodeServer/src/eval.jl:157
 [25] withpath(f::VSCodeServer.var"#66#70"{Bool, Bool, Bool, Module, String, Int64, Int64, String, VSCodeServer.ReplRunCodeRequestParams}, path::String)
    @ VSCodeServer ~/.vscode/extensions/julialang.language-julia-1.7.12/scripts/packages/VSCodeServer/src/repl.jl:249
 [26] (::VSCodeServer.var"#65#69"{Bool, Bool, Bool, Module, String, Int64, Int64, String, VSCodeServer.ReplRunCodeRequestParams})()
    @ VSCodeServer ~/.vscode/extensions/julialang.language-julia-1.7.12/scripts/packages/VSCodeServer/src/eval.jl:155
 [27] hideprompt(f::VSCodeServer.var"#65#69"{Bool, Bool, Bool, Module, String, Int64, Int64, String, VSCodeServer.ReplRunCodeRequestParams})
    @ VSCodeServer ~/.vscode/extensions/julialang.language-julia-1.7.12/scripts/packages/VSCodeServer/src/repl.jl:38
 [28] (::VSCodeServer.var"#64#68"{Bool, Bool, Bool, Module, String, Int64, Int64, String, VSCodeServer.ReplRunCodeRequestParams})()
    @ VSCodeServer ~/.vscode/extensions/julialang.language-julia-1.7.12/scripts/packages/VSCodeServer/src/eval.jl:126
 [29] with_logstate(f::Function, logstate::Any)
    @ Base.CoreLogging ./logging.jl:511
 [30] with_logger
    @ ./logging.jl:623 [inlined]
 [31] (::VSCodeServer.var"#63#67"{VSCodeServer.ReplRunCodeRequestParams})()
    @ VSCodeServer ~/.vscode/extensions/julialang.language-julia-1.7.12/scripts/packages/VSCodeServer/src/eval.jl:225
 [32] #invokelatest#2
    @ ./essentials.jl:729 [inlined]
 [33] invokelatest(::Any)
    @ Base ./essentials.jl:726
 [34] macro expansion
    @ ~/.vscode/extensions/julialang.language-julia-1.7.12/scripts/packages/VSCodeServer/src/eval.jl:34 [inlined]
 [35] (::VSCodeServer.var"#61#62")()
    @ VSCodeServer ./task.jl:484
in expression starting at /tmp/tt.jl:58
in expression starting at /tmp/tt.jl:57

[chriselrod]

Thanks for the issue, it should now be fixed and tested.

FWIW, @fastmath probably won't change anything LV is currently doing (but it'll be relevant after the rewrite).