[PATCH] D98047: [AMDGPU][GlobalISel] Transform (fadd (fma x, y, (fpext (fmul u, v))), z) -> (fma x, y, (fma (fpext u), (fpext 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 in which two function arguments are multiplied, the
result of the multiplication gets extended, which gets added to the
result of the multiplication of another two arguments, and the result
of that gets added to the last function argument. The result of the
combiner will be a fma instruction within a fma instruction.


https://reviews.llvm.org/D98047

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-ext-fma.ll

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