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spirv: Propagate alignments to deref chains via casts

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This commit propagates the alignment information provided either through
the Alignment decoration on pointers or via the alignment mem operands
to OpLoad, OpStore, and OpCopyMemory to the NIR deref chain.  It does so
by wrapping the deref in a cast.  NIR should be able to clean up most
unnecessary casts only leaving us with the useful alignment information.

Reviewed-by: Jesse Natalie <jenatali@microsoft.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6472>
This commit is contained in:
Jason Ekstrand
2020-08-27 18:34:50 -05:00
committed by Marge Bot
parent 207b462e93
commit 3135984ad0
2 changed files with 92 additions and 4 deletions
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23
src/compiler/nir/nir_builder.h
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@@ -1210,6 +1210,29 @@ nir_build_deref_cast(nir_builder *build, nir_ssa_def *parent,
return deref;
}
static inline nir_deref_instr *
nir_alignment_deref_cast(nir_builder *build, nir_deref_instr *parent,
uint32_t align_mul, uint32_t align_offset)
{
nir_deref_instr *deref =
nir_deref_instr_create(build->shader, nir_deref_type_cast);
deref->mode = parent->mode;
deref->type = parent->type;
deref->parent = nir_src_for_ssa(&parent->dest.ssa);
deref->cast.ptr_stride = nir_deref_instr_array_stride(deref);
deref->cast.align_mul = align_mul;
deref->cast.align_offset = align_offset;
nir_ssa_dest_init(&deref->instr, &deref->dest,
parent->dest.ssa.num_components,
parent->dest.ssa.bit_size, NULL);
nir_builder_instr_insert(build, &deref->instr);
return deref;
}
/** Returns a deref that follows another but starting from the given parent
*
* The new deref will be the same type and take the same array or struct index