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Simon Pilgrim 9a5ddff4c3 [Support] Add KnownBits::icmp helpers.
Check if all possible values for a pair of knownbits give the same icmp result - these are based off the checks performed in InstCombineCompares.cpp and D86578.

Add exhaustive unit test coverage - a followup will update InstCombineCompares.cpp to use this.
2021-01-04 12:46:27 +00:00
..
2020-12-03 20:11:11 +01:00