[PATCH] D113603: [x86] fold vector (X > -1) & Y to shift+andn

[Phoebe Wang via Phabricator via llvm-commits]

pengfei added inline comments.


================
Comment at: llvm/lib/Target/X86/X86ISelLowering.cpp:45812
+  // requires "and" rather than "andn":
+  // and (pcmpgt X, -1), Y --> pandn (sra X, BW-1), Y
+  if (supportedVectorShiftWithImm(VT.getSimpleVT(), Subtarget, ISD::SRA)) {
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What's the BW mean? Byte and word? But the tests show for i16 and i32.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D113603/new/

https://reviews.llvm.org/D113603