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Author SHA1 Message Date
Duncan Sands 3a48b87c54 Fix PR6165. The bug was that LHSKnownZero was being and'd with DemandedMask 
when it should have been and'd with LowBits.  Fix that and while there beef
up the logic in the case of a negative LHS.

llvm-svn: 94745
 2010-01-28 17:22:42 +00:00
Chris Lattner 7e0449172c move the 'SimplifyDemandedFoo' methods out to their own file, cutting 1K lines out of instcombine.cpp 
llvm-svn: 92465
 2010-01-04 07:17:19 +00:00