Carl Ritson 9bda1de0b6 [TwoAddressInstruction] Propagate undef flags for partial defs (#79286) ...

If part of a register (lowered from REG_SEQUENCE) is undefined then we
should propagate undef flags to uses of those lanes. This is only
performed when live intervals are present as it requires live intervals
to correctly match uses to defs, and the primary goal is to allow
precise computation of subrange intervals.

2024-02-07 16:46:00 +09:00

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