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spirv: Make better use of vtn_pointer_uses_ssa_offset

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The choice of whether or not we should use block_load/store isn't a
choice between external and not so much as a choice between deref
instructions and manually calculated offsets.  In vtn_pointer_from_ssa,
we guard the index+offset case behind vtn_pointer_uses_ssa_offset and
then branch out from there.

Reviewed-by: Alejandro Piñeiro <apinheiro@igalia.com>
Reviewed-by: Caio Marcelo de Oliveira Filho <caio.oliveira@intel.com>
This commit is contained in:
Jason Ekstrand
2018-12-14 18:25:38 -06:00
committed by Jason Ekstrand
parent adc155a815
commit 3a7c5667c8
1 changed files with 13 additions and 15 deletions
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16
src/compiler/spirv/vtn_variables.c
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@@ -917,7 +917,7 @@ _vtn_variable_load_store(struct vtn_builder *b, bool load,
struct vtn_ssa_value *
vtn_variable_load(struct vtn_builder *b, struct vtn_pointer *src)
{
if (vtn_pointer_is_external_block(b, src)) {
if (vtn_pointer_uses_ssa_offset(b, src)) {
return vtn_block_load(b, src);
} else {
struct vtn_ssa_value *val = NULL;
@@ -930,7 +930,7 @@ void
vtn_variable_store(struct vtn_builder *b, struct vtn_ssa_value *src,
struct vtn_pointer *dest)
{
if (vtn_pointer_is_external_block(b, dest)) {
if (vtn_pointer_uses_ssa_offset(b, dest)) {
vtn_assert(dest->mode == vtn_variable_mode_ssbo ||
dest->mode == vtn_variable_mode_workgroup);
vtn_block_store(b, src, dest);
@@ -1625,21 +1625,19 @@ vtn_pointer_from_ssa(struct vtn_builder *b, nir_ssa_def *ssa,
ptr->type = ptr_type->deref;
ptr->ptr_type = ptr_type;
if (ptr->mode == vtn_variable_mode_ubo ||
ptr->mode == vtn_variable_mode_ssbo) {
if (vtn_pointer_uses_ssa_offset(b, ptr)) {
/* This pointer type needs to have actual storage */
vtn_assert(ptr_type->type);
if (ptr->mode == vtn_variable_mode_ubo ||
ptr->mode == vtn_variable_mode_ubo) {
vtn_assert(ssa->num_components == 2);
ptr->block_index = nir_channel(&b->nb, ssa, 0);
ptr->offset = nir_channel(&b->nb, ssa, 1);
} else if ((ptr->mode == vtn_variable_mode_workgroup &&
b->options->lower_workgroup_access_to_offsets) ||
ptr->mode == vtn_variable_mode_push_constant) {
/* This pointer type needs to have actual storage */
vtn_assert(ptr_type->type);
} else {
vtn_assert(ssa->num_components == 1);
ptr->block_index = NULL;
ptr->offset = ssa;
}
} else {
assert(!vtn_pointer_is_external_block(b, ptr));
const struct glsl_type *deref_type = ptr_type->deref->type;