[PATCH] D41096: [X86] Initial support for prefer-vector-width function attribute

Craig Topper via Phabricator via llvm-commits llvm-commits at lists.llvm.org
Wed Dec 13 09:42:03 PST 2017

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craig.topper added a comment.

getHostCPUName/getHostCPUFeatures is called by the clang driver long before any code is parsed. How would it know if the code contained any 512-bit instructions?


https://reviews.llvm.org/D41096

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