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3 Commits

Author SHA1 Message Date
Duncan Sands
ac512171ff 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).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@94802 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-29 06:18:46 +00:00
Duncan Sands
2c47368a7d 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.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@94745 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-28 17:22:42 +00:00
Chris Lattner
e0b4b721aa move the 'SimplifyDemandedFoo' methods out to their own file, cutting 1K lines out of instcombine.cpp 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92465 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-04 07:17:19 +00:00