Craig Topper cff357c322 [InstCombine][KnownBits] Use KnownBits better to detect nsw adds ...

Change checkRippleForAdd from a heuristic to a full check -
if it is provable that the add does not overflow return true, otherwise false.

Patch by Yoav Ben-Shalom

Differential Revision: https://reviews.llvm.org/D32686

llvm-svn: 302093

2017-05-03 23:22:46 +00:00

4.5 KiB

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