[PATCH] D24221: AVX512F: FMA intrinsic + FNEG - sequence optimization

[Elena Demikhovsky via llvm-commits]

delena created this revision.
delena added reviewers: spatel, RKSimon, igorb.
delena added a subscriber: llvm-commits.
delena set the repository for this revision to rL LLVM.

The previous patch https://reviews.llvm.org/D23313 does not cover AVX-512F, KNL set.
FNEG(x) operation is lowered  to (bitcast (vpxor (bitcast x), (bitcast constfp(0x80000000))).
It happens because FP XOR is not supported for 512-bit data types on KNL and we use integer XOR instead.
I added pattern match for integer XOR.

Repository:
  rL LLVM

https://reviews.llvm.org/D24221

Files:
  ../lib/Target/X86/X86ISelLowering.cpp
  ../test/CodeGen/X86/fma-fneg-combine.ll

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