Simon Pilgrim b9e4679976 [DAG] canCreateUndefOrPoison - add handling for ADD/SUB/MUL overflow nodes (#146322) ...

Neither the arithmetic value or overflow result can create undef/poison from regular operands values.

We have complete test coverage for all ADDO/SUBO nodes, 32-bit codegen handles the _CARRY variants but until #145939 lands AND DAGCombiner::visitFREEZE handles multiple results we can't see any codegen change.

Pulled out of #145939

2025-06-30 13:26:57 +01:00

511 KiB

Raw Blame History

View Raw