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i686-apple-darwin chooses a pre-pentiumpro cpu by default #53423

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gnzlbg opened this issue Aug 16, 2018 · 1 comment
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i686-apple-darwin chooses a pre-pentiumpro cpu by default #53423

gnzlbg opened this issue Aug 16, 2018 · 1 comment
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A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. I-slow Issue: Problems and improvements with respect to performance of generated code. O-macos Operating system: macOS

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@gnzlbg
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gnzlbg commented Aug 16, 2018 •
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The first 32-bit x86 apple machine used the "yonah" CPU, but we (and clang) set a generic i686 CPU instead that has no MMX, no SSE, etc.

This is also clang bug: https://bugs.llvm.org/show_bug.cgi?id=38594

We should wait and see how clang resolves this bug before doing anything.
@gnzlbg gnzlbg mentioned this issue Aug 17, 2018
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@estebank estebank added A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. I-slow Issue: Problems and improvements with respect to performance of generated code. O-macos Operating system: macOS labels Jan 19, 2019
@gnzlbg gnzlbg mentioned this issue Mar 16, 2019
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@gnzlbg
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gnzlbg commented Mar 16, 2019

This appears to be fixed now: https://rust.godbolt.org/z/UqjUHQ the default CPU is "yonah".

@gnzlbg gnzlbg closed this as completed Mar 16, 2019
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