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  • Dan Gohman's avatar
    Add a ConstantSignedRange class, which does for signed integers · 5035fbf9
    Dan Gohman authored
    what ConstantRange does for unsigned integers. Factor out a
    common base class for common functionality.
    
    Add some new functions for performing arithmetic on constant
    ranges. Some of these are currently just stubbed out with
    conservative implementations.
    
    Add unittests for ConstantRange and ConstantSignedRange.
    
    llvm-svn: 75177
    5035fbf9
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