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Author SHA1 Message Date
Evan Cheng 0be4144a68 Allow machine-cse to look across MBB boundary when cse'ing instructions that 
define physical registers. It's currently very restrictive, only catching
cases where the CE is in an immediate (and only) predecessor. But it catches
a surprising large number of cases.

rdar://10660865

llvm-svn: 147827
 2012-01-10 02:02:58 +00:00
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