[PATCH] D97938: [AMDGPU][GlobalISel] Transform (fadd (fma x, y, (fmul u, v)), z) -> (fma x, y, (fma u, v, z))

[Mateja Marjanovic via Phabricator via llvm-commits]

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Instead of add and mul instructions, use v_mad, v_mac or v_fma if fma
instructions are faster and are legal for the given architecture.
Combiner for a case that has a fma/fmad instruction as an operand for
the given MI. The transformed instruction has a fma/fmad instruction
inside another fma/fmad instruction.


https://reviews.llvm.org/D97938

Files:
  llvm/include/llvm/CodeGen/GlobalISel/CombinerHelper.h
  llvm/include/llvm/Target/GlobalISel/Combine.td
  llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp
  llvm/test/CodeGen/AMDGPU/GlobalISel/combine-fma-add-fma-mul.ll

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