[PATCH] D70246: [InstCombine] remove identity shuffle simplification for mask with undefs

[Sanjay Patel via Phabricator via llvm-commits]

spatel updated this revision to Diff 230453.
spatel added a comment.

Patch updated:
Enhance SimplifyDemandedVectorElts to recognize a demand-limited identity mask. 
As Eli expected, this reduces the number of test diffs (preserves some existing optimizations) - thanks!


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D70246/new/

https://reviews.llvm.org/D70246

Files:
  llvm/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp
  llvm/lib/Transforms/InstCombine/InstCombineVectorOps.cpp
  llvm/test/Transforms/InstCombine/X86/x86-avx2.ll
  llvm/test/Transforms/InstCombine/X86/x86-avx512.ll
  llvm/test/Transforms/InstCombine/X86/x86-fma.ll
  llvm/test/Transforms/InstCombine/X86/x86-pack.ll
  llvm/test/Transforms/InstCombine/X86/x86-pshufb.ll
  llvm/test/Transforms/InstCombine/X86/x86-sse4a.ll
  llvm/test/Transforms/InstCombine/X86/x86-vpermil.ll
  llvm/test/Transforms/InstCombine/shuffle_select.ll
  llvm/test/Transforms/InstCombine/vec_demanded_elts.ll
  llvm/test/Transforms/InstCombine/vec_shuffle.ll

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