[PATCH] D130995: [X86] Promote i16 CTTZ/CTTZ_ZERO_UNDEF always.

[Craig Topper via Phabricator via llvm-commits]

craig.topper created this revision.
craig.topper added reviewers: RKSimon, skan, pengfei.
Herald added subscribers: StephenFan, hiraditya.
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If we're going to emit a rep prefix before bsf as proposed in
D130956 <https://reviews.llvm.org/D130956>, it makes sense to promote i16 operations to i32 to avoid
the false depedency of tzcntw.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D130995

Files:
  llvm/lib/Target/X86/X86ISelLowering.cpp
  llvm/test/CodeGen/X86/bmi-intrinsics-fast-isel.ll
  llvm/test/CodeGen/X86/clz.ll
  llvm/test/CodeGen/X86/lzcnt-tzcnt.ll

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