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4 Commits

Author SHA1 Message Date
Evan Cheng
7855c5d08f 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
bac3e87eaa 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
68e1ed8752 Teach machine cse to commute instructions. 
llvm-svn: 121903
 2010-12-15 22:16:21 +00:00
Evan Cheng
668ceddeec Enable machine cse pass. 
llvm-svn: 98132
 2010-03-10 03:07:41 +00:00