Simon Pilgrim e635520be8
[DAG] computeKnownBits - abs(x) will be zero in the upper bits if x is sign-extended (#94382)
As reported on https://github.com/llvm/llvm-project/issues/94344 - if x has more than one signbit, then the upper bits of its absolute value are guaranteed to be zero

Alive2: https://alive2.llvm.org/ce/z/a87fHU

Fixes #94344
2024-06-05 10:58:54 +01:00
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2023-09-20 16:58:00 +01:00
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