csstormq 96af114941 [InstCombine] Preserve the nsw/nuw flags for (X | Op01C) + Op1C --> X + (Op01C + Op1C) (#94586) ...

This patch simplifies `sdiv` to `udiv` by preserving the `nsw` flag for
`(X | Op01C) + Op1C --> X + (Op01C + Op1C)` if the sum of `Op01C` and
`Op1C` will not overflow, and preserves the `nuw` flag unconditionally.

Alive2 Proofs (provided by @nikic): https://alive2.llvm.org/ce/z/nrdCZT,
https://alive2.llvm.org/ce/z/YnJHnH

2024-06-08 08:38:27 +08:00

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