[PATCH] D59682: [X86] Add BSR/BSF/BSWAP intrinsics to ia32intrin.h to match gcc.

[Craig Topper via Phabricator via cfe-commits]

craig.topper created this revision.
craig.topper added reviewers: RKSimon, spatel.
Herald added a project: clang.
Herald added a subscriber: cfe-commits.

These are all implemented by icc as well.

I made bit_scan_forward/reverse forward to the __bsfd/__bsrq since we also have
__bsfq/__bsrq.

Note, when lzcnt is enabled the bsr intrinsics generates lzcnt+xor instead of bsr.


Repository:
  rC Clang

https://reviews.llvm.org/D59682

Files:
  lib/Headers/ia32intrin.h
  lib/Headers/immintrin.h
  test/CodeGen/bitscan-builtins.c
  test/CodeGen/x86-bswap.c

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