[PATCH] D150646: [clang][X86] Add __cpuidex function to cpuid.h

[Reid Kleckner via Phabricator via cfe-commits]

rnk added a comment.

I think MSVC defines `_MSC_EXTENSIONS` under one of its compatibility modes as well, so it's not a good indicator of "is this compiler MSVC-like". I think we should be exposing the `__cpudex` builtin any time we are being MSVC-like, not under `fms-compatibility`. Would that make things sensible again?


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D150646/new/

https://reviews.llvm.org/D150646