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353 Commits

Author SHA1 Message Date
Chris Lattner
3e1cd5c9bf Remove unneeded code I added. 
llvm-svn: 51878
 2008-06-02 18:39:07 +00:00
Chris Lattner
ea60f0ccc3 move CannotBeNegativeZero to ValueTracking. Simplify some signbit comparisons. 
llvm-svn: 51864
 2008-06-02 01:29:46 +00:00
Chris Lattner
4960857273 move ComputeMaskedBits, MaskedValueIsZero, and ComputeNumSignBits 
out of instcombine into a new file in libanalysis.  This also teaches
ComputeNumSignBits about the number of sign bits in a constantint.

llvm-svn: 51863
 2008-06-02 01:18:21 +00:00