Dhruv Chawla 4c48b3cb5c [GISel][CombinerHelper] Push freeze through non-poison-producing operands (#90618) ...

This combine matches the existing fold in InstCombine, i.e.
InstCombinerImpl::pushFreezeToPreventPoisonFromPropagating.

It tries to push freeze through an operand if the operand has only one
maybe-poison operand and all other operands are guaranteed non-poison,
and if the operation itself cannot generate poison (eg. add with nsw can
generate poison, even with non-poison operands).

This is beneficial because it can potentially enable other optimizations
to occur that would otherwise be blocked because of the freeze.

2024-05-23 13:45:52 +05:30

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