[PATCH] D65305: [InstCombine] remove flop from lerp patterns

[Sanjay Patel via Phabricator via llvm-commits]

spatel created this revision.
spatel added reviewers: xbolva00, RKSimon, lebedev.ri.
Herald added subscribers: hiraditya, mcrosier.
Herald added a project: LLVM.

(Y * (1.0 - Z)) + (X * Z) --> 
Y - (Y * Z) + (X * Z) -->
Y + Z * (X - Y)

This is part of solving:
https://bugs.llvm.org/show_bug.cgi?id=42716

Factoring eliminates an instruction, so that should be a good canonicalization. The potential conversion to FMA would be handled by the backend based on target capabilities.


https://reviews.llvm.org/D65305

Files:
  llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp
  llvm/test/Transforms/InstCombine/fadd-fsub-factor.ll

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