improve inference of CPU_THREADS in Sys.__init__#54384
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Without this change, the compiler fails to notice that `env_threads isa Int` in the fall-through case, leading to a union-split with a branch that is in fact unreachable: ``` 43 ┄ %109 = φ (#41 => %105, #42 => %108)::Union{Nothing, Int64} │ %110 = (%109 isa Int64)::Bool └─── goto #45 if not %110 ... 45 ─ %126 = π (%109, Nothing) │ Base.convert(Int64, %126)::Union{} └─── unreachable ``` Co-authored-by: Jeff Bezanson <jeff.bezanson@gmail.com>
topolarity
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CPU_THREADS in Sys.__init__CPU_THREADS in Sys.__init__
aviatesk
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May 7, 2024
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Just for record: the root inference issue here is #43130. |
lazarusA
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Jul 12, 2024
Without this change, the compiler fails to notice that `env_threads isa Int` in the fall-through case, leading to a union-split with a branch that is in fact unreachable: ``` 43 ┄ %109 = φ (JuliaLang#41 => %105, JuliaLang#42 => %108)::Union{Nothing, Int64} │ %110 = (%109 isa Int64)::Bool └─── goto JuliaLang#45 if not %110 ... 45 ─ %126 = π (%109, Nothing) │ Base.convert(Int64, %126)::Union{} └─── unreachable ``` After this change, the union-split is eliminated. Co-authored-by: Jeff Bezanson <jeff.bezanson@gmail.com>
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Without this change, the compiler fails to notice that
env_threads isa Intin the fall-through case, leading to a union-split with a branch that is in fact unreachable:After this change, the union-split is eliminated.