2 Commits

Author	SHA1	Message	Date
Chris Lattner	7a6aa1a391	Enhance a bunch of transformations in instcombine to start generating ... exact/nsw/nuw shifts and have instcombine infer them when it can prove that the relevant properties are true for a given shift without them. Also, a variety of refactoring to use the new patternmatch logic thrown in for good luck. I believe that this takes care of a bunch of related code quality issues attached to PR8862. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125267 91177308-0d34-0410-b5e6-96231b3b80d8	2011-02-10 05:36:31 +00:00
Dale Johannesen	201ab3acff	When checking that the necessary bits are zero in ... order to reduce ((x<<30)>>24) to x<<6, check the correct bits. PR 8547. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118665 91177308-0d34-0410-b5e6-96231b3b80d8	2010-11-10 01:30:56 +00:00