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Commit Graph

Author	SHA1	Message	Date
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

Author

SHA1

Message

Date

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 Commits