[PATCH] D55677: [Builltins][X86] Provide implementations of __lzcnt16, __lzcnt, __lzcnt64 for MS compatibility. Remove declarations from intrin.h and implementations from lzcntintrin.h

[Craig Topper via Phabricator via cfe-commits]

craig.topper created this revision.
craig.topper added a reviewer: rnk.

intrin.h had forward declarations for these and lzcntintrin.h had implementations that were only available with -mlzcnt or a -march that supported the lzcnt feature. But the 32-bit version was misnamed in lzcntrin.h

This patch provides an independent implementation for MS that doesn't rely on the X86 feature flag.

Fixes PR40014


https://reviews.llvm.org/D55677

Files:
  include/clang/Basic/Builtins.def
  lib/CodeGen/CGBuiltin.cpp
  lib/Headers/intrin.h
  lib/Headers/lzcntintrin.h
  test/CodeGen/lzcnt-builtins.c
  test/CodeGen/ms-intrinsics-other.c
  test/Headers/x86intrin-2.c

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