Yingwei Zheng d9e92765c5 [ConstantRange] Improve ConstantRange::binaryXor (#80146) ...

`ConstantRange::binaryXor` gives poor results as it currently depends on
`KnownBits::operator^`.
Since `sub A, B` is canonicalized into `xor A, B` if `B` is the subset
of `A`, this patch reverts the transform in `ConstantRange::binaryXor`,
which will give better results.

Alive2: https://alive2.llvm.org/ce/z/bmTMV9
Fixes #79696.

2024-02-08 22:34:52 +08:00

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