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* sext(undef) = 0, because the top bits will all be the same.Evan Cheng2011-03-151-2/+2
| | | | | | | zext(undef) = 0, because the top bits will be zero. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127649 91177308-0d34-0410-b5e6-96231b3b80d8
* Teach machine cse to commute instructions.Evan Cheng2010-12-151-0/+40
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121903 91177308-0d34-0410-b5e6-96231b3b80d8
* Enable machine cse pass.Evan Cheng2010-03-101-0/+39
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98132 91177308-0d34-0410-b5e6-96231b3b80d8