System values are never arrays or structs so we can assume a direct var
deref.  This simplifies things a bit and prevents us from accidentally
throwing away an array index.

Suggested-by: Caio Marcelo de Oliveira Filho <caio.oliveira@intel.com>
Reviewed-by: Caio Marcelo de Oliveira Filho <caio.oliveira@intel.com>

Note that this patch needs to come late in the series since this pass
can be run after any pass that damages nir_metadata_loop_analysis.

Rob Clark authored Apr 04, 2018 and Faith Ekstrand committed Jun 01, 2018

Signed-off-by: Rob Clark <robdclark@gmail.com>

Rob Clark authored Apr 04, 2018 and Faith Ekstrand committed Jun 01, 2018

Useful in a few other places.. let's not copy-pasta

Signed-off-by: Rob Clark <robdclark@gmail.com>

This completely reworks the pass to support deref instructions and
delete support for old deref chains

Now that it's rewritten for deref instructions, we can turn it back on.

Bas Nieuwenhuizen authored Apr 25, 2018 and Faith Ekstrand committed May 31, 2018

v2: Store the result in ctx->ssa_defs.

It's only used by the ir3 stand-alone compiler and Rob said we could
delete it.