[PATCH] D15739: AVX-512: Kreg set 0/1 optimization

[Elena Demikhovsky via llvm-commits]

delena created this revision.
delena added a reviewer: DavidKreitzer.
delena added a subscriber: llvm-commits.

The pattern that sets a mask register to all-ones
KXNOR %kn, %kn, %kn 
is replaced with 
KXNOR %k0, %k0, %kn - KNL optimization.

http://reviews.llvm.org/D15739

Files:
  ../lib/Target/X86/X86InstrInfo.cpp
  ../test/CodeGen/X86/avx512-gather-scatter-intrin.ll
  ../test/CodeGen/X86/avx512-mask-op.ll
  ../test/CodeGen/X86/masked_gather_scatter.ll

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