Ramkumar Ramachandra d76ea250c8 Reland [InstCombine] Teach foldSelectOpOp about samesign (#124320) ...

Changes: There was a serious bug in the previous patch, leading to a
miscompile. See #122723 for the miscompile report from Alexander, and
the follow-up investigation by Nikita. The patch has since been
reworked, and now includes the testcase from the miscompile.

Follow up on 4a0d53a (PatternMatch: migrate to CmpPredicate) to get rid
of one of the FIXMEs it introduced by replacing a predicate comparison
with CmpPredicate::getMatching.

Co-authored-by: Nikita Popov <npopov@redhat.com>

2025-01-28 16:53:01 +00:00

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