3 Commits

Author	SHA1	Message	Date
Duncan Sands	c8a3e56870	Having RHSKnownZero and RHSKnownOne be alternative names for KnownZero and KnownOne ... (via APInt &RHSKnownZero = KnownZero, etc) seems dangerous and confusing to me: it is easy not to notice this, and then wonder why KnownZero/RHSKnownZero changed underneath you when you modified RHSKnownZero/KnownZero etc. So get rid of this. No intended functionality change (tested with "make check" + llvm-gcc bootstrap). llvm-svn: 94802	2010-01-29 06:18:46 +00:00
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