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3 Commits

Author SHA1 Message Date
Evan Cheng
bf34a5ec22 sext(undef) = 0, because the top bits will all be the same. 
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
 2011-03-15 02:22:10 +00:00
Evan Cheng
a63cde26ff Teach machine cse to commute instructions. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121903 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-15 22:16:21 +00:00
Evan Cheng
fac4f1f181 Enable machine cse pass. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98132 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-03-10 03:07:41 +00:00