[PATCH] D109953: [X86] Combine the FADD(A, FMA(B, C, 0)) to FMA(B, C, A)

[LiuChen via Phabricator via llvm-commits]

LiuChen3 created this revision.
Herald added subscribers: pengfei, hiraditya.
LiuChen3 requested review of this revision.
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This patch is to support transform something like
_mm512_add_ph(acc, _mm512_fmadd_pch(a, b, _mm512_setzero_ph()))
to _mm512_fmadd_pch(a, b, acc).


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D109953

Files:
  llvm/lib/Target/X86/X86ISelLowering.cpp
  llvm/test/CodeGen/X86/avx512fp16-combine-vfmac-fadd.ll

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