[PATCH] D27905: AMDGPU: Swap order of operands in fadd/fsub combine

[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.

FMA is canonicalized to constant in the middle operand. Do
 the same so fmad matches and avoid an extra combine step.


https://reviews.llvm.org/D27905

Files:
  lib/Target/AMDGPU/SIISelLowering.cpp
  test/CodeGen/AMDGPU/fmul-2-combine-multi-use.ll
  test/CodeGen/AMDGPU/fmuladd.f16.ll
  test/CodeGen/AMDGPU/fmuladd.f32.ll

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