Siyuan Zhu 946b326803 [InstSimplify] sdiv a (1 srem b) --> a
Extend the existing fold for division by zero or one to use known
bits, so it catches additional patterns like division by
(1 srem b).

Fixes https://github.com/llvm/llvm-project/issues/62163.

Differential Revision: https://reviews.llvm.org/D149001
2023-04-24 14:37:07 +02:00
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