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Author SHA1 Message Date
Chad Rosier
f6c1b3b81f TargetLoweringOpt is a struct used by DAGCombine, not a pass. 
llvm-svn: 133062
 2011-06-15 16:48:02 +00:00
Chad Rosier
30333c668f When pattern matching during instruction selection make sure shl x,1 is not 
converted to add x,x if x is a undef.  add undef, undef does not guarantee
that the resulting low order bit is zero.
Fixes <rdar://problem/9453156> and <rdar://problem/9487392>.

llvm-svn: 133022
 2011-06-14 22:29:10 +00:00