Nikita Popov 78f7ca0980 [InstCombine] Use KnownBits predicate helpers (#115874) ...

Inside foldICmpUsingKnownBits(), instead of rolling our own logic based
on min/max values, make use of ICmpInst::compare() working on KnownBits.
This gives better results for the equality predicates. In practice, the
improvement is only for pointers, because isKnownNonEqual() handles the
non-pointer case.

I've adjusted some tests to prevent the new fold from triggering, to
retain their original intent of testing constant expressions.

2024-11-14 10:13:50 +01:00

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