Philip Reames ef884e155d [rs4gc] don't force a conflict for a canonical broadcast ...

A broadcast is a shufflevector where only one input is used. Because of the way we handle constants (undef is a constant), the canonical shuffle sees a meet of (some value) and (nullptr). Given this, every broadcast gets treated as a conflict and a new base pointer computation is added.

The other way to tackle this would be to change constant handling specifically for undefs, but this seems easier.

Differential Revision: https://reviews.llvm.org/D98315

2021-03-16 12:59:06 -07:00

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