Vector algorithms: Add compile time checks for ISA features#6098
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matbech wants to merge 2 commits intomicrosoft:mainfrom
Open
Vector algorithms: Add compile time checks for ISA features#6098matbech wants to merge 2 commits intomicrosoft:mainfrom
matbech wants to merge 2 commits intomicrosoft:mainfrom
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When the STL is compiled with /arch:SSE4.2 or /arch:AVX2, the runtime checks for the respective ISA features (SSE42, AVX2) are unnecessary. This change adds a compile time check using __check_arch_support to avoid the runtime cost.
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But what is the purpose? For end users, the STL comes precompiled, so |
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For custom built binaries (msvcp140_oss.dll) with modern |
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For reference,
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When the STL is compiled with /arch:SSE4.2 or /arch:AVX2, the runtime checks for the respective ISA features (SSE42, AVX2) are unnecessary. This change adds a compile time check using __check_arch_support to avoid the runtime cost.