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

Mon Jun 26 14:30:32 PDT 2023

glandium added a comment.

In D150646#4382763 <https://reviews.llvm.org/D150646#4382763>, @aidengrossman wrote:

> Interesting. I would've thought `-fms-extensions` by itself would've declared that macro (which is what I gathered reading what caused the MSVC compatible builtins to get included in clang), but apparently not. For whatever reason, `LangOpts.MicrosoftExt` only seems to be set to true if `-fms-compaitilibty-version` (maybe on top of `-fms-compatibility`) are also passed (not 100% on this though). I'll have to do some more digging soon.

Did you find something?

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D150646/new/

https://reviews.llvm.org/D150646