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4 Commits

Author SHA1 Message Date
Evan Cheng
97b5beb7fe 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


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147827 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-01-10 02:02:58 +00:00
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