[PATCH] D117032: GlobalIsel: Fix fma combine when one of the uses comes from unmerge

[Petar Avramovic via Phabricator via llvm-commits]

Petar.Avramovic updated this revision to Diff 399319.
Petar.Avramovic added a comment.

Previous version already had llvm-ir test with fma pattern covered in matchCombineFAddFMulToFMadOrFMA.
Cover remaining potential errors when MRI.getVRegDef(Reg)->getOperand(0).getReg() is used. Adding targeted mir tests for all these cases.
I don't have llvm-ir tests for these since they seem to combine before legalizer, unmerges that causes bad combine are generated in legalizer.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D117032/new/

https://reviews.llvm.org/D117032

Files:
  llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp
  llvm/test/CodeGen/AMDGPU/GlobalISel/combine-fma-add-mul-post-legalize.mir
  llvm/test/CodeGen/AMDGPU/GlobalISel/combine-fma-add-mul.ll
  llvm/test/CodeGen/AMDGPU/GlobalISel/combine-fma-unmerge-values.mir

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