[PATCH] D37999: InstSimplify: Constant fold some canonicalizes

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
Herald added a subscriber: wdng.

+/-0 is obviously foldable. Other non-special, non-subnormal
values are also probably OK.

      

Also folds undef to 0, even though based on the users it
may make more sense to fold to 1 (e.g. fmul fast x, canonicalize(undef))


https://reviews.llvm.org/D37999

Files:
  include/llvm/IR/Constants.h
  lib/Analysis/InstructionSimplify.cpp
  lib/IR/Constants.cpp
  test/Transforms/InstCombine/maxnum.ll
  test/Transforms/InstCombine/minnum.ll
  test/Transforms/InstSimplify/canonicalize.ll

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