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Commit acbed5e5 authored by Mark Heffernan's avatar Mark Heffernan
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Clarify HowFarToZero computation when the step is a positive power of two. ... 

Clarify HowFarToZero computation when the step is a positive power of two.  Functionally this should be identical to the existing code except for the case where Step is maximally negative (eg, INT_MIN).  We now punt in that one corner case to make reasoning about the code easier.

llvm-svn: 224274
parent 4a464293
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