[PATCH] [Reassociation][PR21205] Don't canonicalize X - undef to X + (-undef).

[Chad Rosier]

Hi joerg, resistor, chandlerc, hfinkel,

This isn't going to expose additional opportunities for reassociation, AFAICT, and it's currently causing an assertion failure.
For further details, see: http://llvm.org/bugs/show_bug.cgi?id=21205
Please have a look.
Regards,

 Chad

http://reviews.llvm.org/D5674

Files:
  lib/Transforms/Scalar/Reassociate.cpp
  test/Transforms/Reassociate/pr21205.ll
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