[PATCH] D72824: [X86] Add combination for fma and fneg on X86 under strict FP.

[Pengfei Wang via Phabricator via llvm-commits]

pengfei created this revision.
pengfei added reviewers: craig.topper, andrew.w.kaylor, uweigand, RKSimon, LiuChen3.
pengfei added a project: LLVM.

X86 has instructions to calculate fma and fneg at the same time. But we combine the fneg and fma only when fneg is the source operand under strict FP.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D72824

Files:
  llvm/lib/Target/X86/X86ISelLowering.cpp
  llvm/lib/Target/X86/X86ISelLowering.h
  llvm/lib/Target/X86/X86InstrAVX512.td
  llvm/lib/Target/X86/X86InstrFMA.td
  llvm/lib/Target/X86/X86InstrFragmentsSIMD.td
  llvm/test/CodeGen/X86/fp-intrinsics-fma.ll

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