[PATCH] D28448: InstCombine: Do unsafe math combine of fadd + fmuladd + fmul

[Matt Arsenault via Phabricator via llvm-commits]

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(fadd (fmuladd x, y, (fmul u, v), z) -> (fma x, y (fmuladd u, v, z)))

      

DAGCombiner already does this for fma/fmad. InstCombine should be able
to do it for unsafe fmuladds, fma depends on whether it is fast for the
 target.


https://reviews.llvm.org/D28448

Files:
  lib/Transforms/InstCombine/InstCombineAddSub.cpp
  test/Transforms/InstCombine/fmuladd-opt.ll

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