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[ValueTracking] Extend known bits to understand @llvm.bitreverse.

Authored by mcrosier on Jan 16 2017, 2:27 PM.


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mcrosier created this revision.Jan 16 2017, 2:27 PM
RKSimon accepted this revision.Jan 17 2017, 3:57 AM

LGTM - vector tests would be nice but many don't currently work with instcombine

This revision is now accepted and ready to land.Jan 17 2017, 3:57 AM
This revision was automatically updated to reflect the committed changes.