[pull] master from JuliaLang:master #5
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This commit complements JuliaLang#39754 and JuliaLang#39305: implements a logic to use constant-prop'ed results for inlining at union-split callsite. Currently it works only for cases when constant-prop' succeeded for all (union-split) signatures. > example ```julia julia> mutable struct X # NOTE in order to confuse `fieldtype_tfunc`, we need to have at least two fields with different types a::Union{Nothing, Int} b::Symbol end; julia> code_typed((X, Union{Nothing,Int})) do x, a # this `setproperty` call would be union-split and constant-prop will happen for # each signature: inlining would fail if we don't use constant-prop'ed source # since the approximated inlining cost of `convert(fieldtype(X, sym), a)` would # end up very high if we don't propagate `sym::Const(:a)` x.a = a x end |> only |> first ``` > before this commit ```julia CodeInfo( 1 ─ %1 = Base.setproperty!::typeof(setproperty!) │ %2 = (isa)(a, Nothing)::Bool └── goto #3 if not %2 2 ─ %4 = π (a, Nothing) │ invoke %1(_2::X,🅰️ :Symbol, %4::Nothing)::Any └── goto #6 3 ─ %7 = (isa)(a, Int64)::Bool └── goto #5 if not %7 4 ─ %9 = π (a, Int64) │ invoke %1(_2::X,🅰️ :Symbol, %9::Int64)::Any └── goto #6 5 ─ Core.throw(ErrorException("fatal error in type inference (type bound)"))::Union{} └── unreachable 6 ┄ return x ) ``` > after this commit ```julia CodeInfo( 1 ─ %1 = (isa)(a, Nothing)::Bool └── goto #3 if not %1 2 ─ Base.setfield!(x, :a, nothing)::Nothing └── goto #6 3 ─ %5 = (isa)(a, Int64)::Bool └── goto #5 if not %5 4 ─ %7 = π (a, Int64) │ Base.setfield!(x, :a, %7)::Int64 └── goto #6 5 ─ Core.throw(ErrorException("fatal error in type inference (type bound)"))::Union{} └── unreachable 6 ┄ return x ) ```
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