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Author SHA1 Message Date
Chad Rosier 094ac7735b [Reassociate] Canonicalize negative constants out of expressions. 
This is a reapplication of r221171, but we only perform the transformation
on expressions which include a multiplication.  We do not transform rem/div
operations as this doesn't appear to be safe in all cases.

llvm-svn: 221721
 2014-11-11 22:58:35 +00:00
Chad Rosier b3eb452e83 [Reassociate] Better preserve NSW/NUW flags. 
Part of PR12985.

Phabricator Revision: http://reviews.llvm.org/D6172

llvm-svn: 221555
 2014-11-07 22:12:57 +00:00