[PATCH] D57667: [X86][SSE] SimplifyDemandedBitsForTargetNode - PCMPGT(0, X) sign mask

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon created this revision.
RKSimon added reviewers: craig.topper, spatel, lebedev.ri.
Herald added a project: LLVM.

For PCMPGT(0, X) patterns where we only demand the sign bit (e.g. BLENDV or MOVMSK) then we can use X directly.


Repository:
  rL LLVM

https://reviews.llvm.org/D57667

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/avx512-cvt-widen.ll
  test/CodeGen/X86/avx512-cvt.ll
  test/CodeGen/X86/avx512-schedule.ll
  test/CodeGen/X86/bitcast-setcc-128.ll
  test/CodeGen/X86/bitcast-setcc-256.ll
  test/CodeGen/X86/bitcast-setcc-512.ll
  test/CodeGen/X86/movmsk-cmp.ll

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