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Author SHA1 Message Date
Evan Cheng c5c2cfa381 sext(undef) = 0, because the top bits will all be the same. 
zext(undef) = 0, because the top bits will be zero.

llvm-svn: 127649
 2011-03-15 02:22:10 +00:00
Evan Cheng b7ff5a0f20 Teach machine cse to commute instructions. 
llvm-svn: 121903
 2010-12-15 22:16:21 +00:00
Evan Cheng 80ad113731 Enable machine cse pass. 
llvm-svn: 98132
 2010-03-10 03:07:41 +00:00