James Molloy 897048bee3 [ValueTracking] Teach isKnownNonZero about monotonically increasing PHIs ...

If a PHI starts at a non-negative constant, monotonically increases
(only adds of a constant are supported at the moment) and that add
does not wrap, then the PHI is known never to be zero.

llvm-svn: 248796

2015-09-29 14:08:45 +00:00

1.0 KiB

Raw Blame History

View Raw