[PATCH] D27903: AMDGPU: Form more FMAs if fusion is allowed

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
arsenm added a reviewer: nhaehnle.
arsenm added a subscriber: llvm-commits.
Herald added a reviewer: tstellarAMD.
Herald added subscribers: tony-tye, yaxunl, wdng, kzhuravl.

Extend the existing fadd/fsub->fmad combines to produce
FMA if allowed.


https://reviews.llvm.org/D27903

Files:
  lib/Target/AMDGPU/SIISelLowering.cpp
  lib/Target/AMDGPU/SIISelLowering.h
  test/CodeGen/AMDGPU/fmuladd.f16.ll
  test/CodeGen/AMDGPU/fmuladd.f32.ll
  test/CodeGen/AMDGPU/fmuladd.f64.ll
  test/CodeGen/AMDGPU/fmuladd.ll
  test/CodeGen/AMDGPU/mad-sub.ll

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