Simon Pilgrim d460c1de3b [DAG] SimplifyDemandedBits - don't fold sext(x) -> aext(x) if we lose an 0/-1 allsignbits mask (#77296) ...

For targets that use 0/-1 boolean results, we want to keep this pattern through extensions/truncations as much as possible - so avoid simplifying to any_extend even if we don't demand the upper bits.

Noticed in triage for https://reviews.llvm.org/D152928

2024-01-08 18:01:41 +00:00

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