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Author SHA1 Message Date
Erik Verbruggen
0edc5e8391 Reassociate x + -0.1234 * y into x - 0.1234 * y 
This does not require -ffast-math, and it gives CSE/GVN more options to
eliminate duplicate expressions in, e.g.:

  return ((x + 0.1234 * y) * (x - 0.1234 * y));

Differential Revision: http://reviews.llvm.org/D4904



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216169 91177308-0d34-0410-b5e6-96231b3b80d8
 2014-08-21 10:45:30 +00:00
Chad Rosier
3b41039163 [Reassociation] Add support for reassociation with unsafe algebra. 
Vector instructions are (still) not supported for either integer or floating
point.  Hopefully, that work will be landed shortly.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@215647 91177308-0d34-0410-b5e6-96231b3b80d8
 2014-08-14 15:23:01 +00:00