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Author SHA1 Message Date
Chris Lattner 2e01a69e72 Remove unneeded code I added. 
llvm-svn: 51878
 2008-06-02 18:39:07 +00:00
Chris Lattner a12a6de683 move CannotBeNegativeZero to ValueTracking. Simplify some signbit comparisons. 
llvm-svn: 51864
 2008-06-02 01:29:46 +00:00
Chris Lattner 965c769b3c 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