Clarify SCEV code which handle powers of 2
Mark Heffernan
meheff at google.com
Mon Dec 15 13:02:01 PST 2014
Hi Andy,
As discussed in the patch for fixing PR21694, here's a little patch which
clarifies the 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.
Mark
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