Nikita Popov 1fc73cacb2 [InstCombine] Propagate nsw flag when negating ...

When pushing a sub nsw 0, %x negation into an expression, try to
preserve the nsw flag for the cases where this is possible. Do this
by passing the flag through recursive Negator::negate() calls.

Proofs: https://alive2.llvm.org/ce/z/oRPNcY

Differential Revision: https://reviews.llvm.org/D158510

2023-09-14 09:09:45 +02:00

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