[all-commits] [llvm/llvm-project] 76656e: [X86][FP16] Combine the FADD(A, FMA(B, C, 0)) to F...

[MorningLiu via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 76656ec8ec535bd17afc998112a83c7c55ad7719
      https://github.com/llvm/llvm-project/commit/76656ec8ec535bd17afc998112a83c7c55ad7719
  Author: Liu, Chen3 <chen3.liu at intel.com>
  Date:   2021-09-23 (Thu, 23 Sep 2021)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    A llvm/test/CodeGen/X86/avx512fp16-combine-vfmac-fadd.ll

  Log Message:
  -----------
  [X86][FP16] Combine the FADD(A, FMA(B, C, 0)) to FMA(B, C, A)

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).

Differential Revision: https://reviews.llvm.org/D109953