[PATCH] D144081: InstCombine: Fold and/or of fcmp into class

[Matt Arsenault via Phabricator via llvm-commits]

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This is motivated by patterns like !isfinite || zero. The AMDGPU math
libraries have a lot of patterns like this, and I'm trying to fix the
code to be more portable and less dependent on directly calling class
intrinsics.

      

I believe this is the first place where new is.fpclass calls are
introduced. There are more class-like compares that could be
recognized; this is a set I currently care about plus a few extras.

      

I swear I posted this before but can't seem to find it


https://reviews.llvm.org/D144081

Files:
  llvm/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
  llvm/test/Transforms/InstCombine/and-fcmp.ll
  llvm/test/Transforms/InstCombine/create-class-from-logic-fcmp.ll

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