[Mesa-dev] [PATCH 1/3] nir/register: Add a parent_instr field

[Eric Anholt]

Matt Turner <mattst88 at gmail.com> writes:

> From: Jason Ekstrand <jason at jlekstrand.net>
>
> This adds a parent_instr field similar to the one for ssa_def.  The
> difference here is that the parent_instr field on a nir_register can be
> NULL if the register does not have a unique definition or if that
> definition does not dominate all its uses.  We set this field in the
> out-of-SSA pass so that backends can get SSA-like information even after
> they have gone out of SSA.

This will be useful for me, too, for similar multi-step multiply code.

Reviewed-by: Eric Anholt <eric at anholt.net>
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