static bool
split_var_copies_block(nir_block *block, void *void_state)
{
struct split_var_copies_state *state = void_state;
nir_foreach_instr_safe(block, instr) {
if (instr->type != nir_instr_type_intrinsic)
continue;
nir_intrinsic_instr *intrinsic = nir_instr_as_intrinsic(instr);
if (intrinsic->intrinsic != nir_intrinsic_copy_var)
continue;
nir_deref *dest_head = &intrinsic->variables[0]->deref;
nir_deref *src_head = &intrinsic->variables[1]->deref;
nir_deref *dest_tail = get_deref_tail(dest_head);
nir_deref *src_tail = get_deref_tail(src_head);
switch (glsl_get_base_type(src_tail->type)) {
case GLSL_TYPE_ARRAY:
case GLSL_TYPE_STRUCT:
split_var_copy_instr(intrinsic, dest_head, src_head,
dest_tail, src_tail, state);
nir_instr_remove(&intrinsic->instr);
ralloc_steal(state->dead_ctx, instr);
break;
case GLSL_TYPE_FLOAT:
case GLSL_TYPE_INT:
case GLSL_TYPE_UINT:
case GLSL_TYPE_BOOL:
if (glsl_type_is_matrix(src_tail->type)) {
split_var_copy_instr(intrinsic, dest_head, src_head,
dest_tail, src_tail, state);
nir_instr_remove(&intrinsic->instr);
ralloc_steal(state->dead_ctx, instr);
}
break;
default:
unreachable("Invalid type");
break;
}
}
return true;
}
struct vtn_ssa_value *
vtn_local_load(struct vtn_builder *b, nir_deref_var *src)
{
nir_deref *src_tail = get_deref_tail(src);
struct vtn_ssa_value *val = vtn_create_ssa_value(b, src_tail->type);
_vtn_local_load_store(b, true, src, src_tail, val);
if (src_tail->child) {
nir_deref_array *vec_deref = nir_deref_as_array(src_tail->child);
assert(vec_deref->deref.child == NULL);
val->type = vec_deref->deref.type;
if (vec_deref->deref_array_type == nir_deref_array_type_direct)
val->def = vtn_vector_extract(b, val->def, vec_deref->base_offset);
else
val->def = vtn_vector_extract_dynamic(b, val->def,
vec_deref->indirect.ssa);
}
return val;
}
void
vtn_local_store(struct vtn_builder *b, struct vtn_ssa_value *src,
nir_deref_var *dest)
{
nir_deref *dest_tail = get_deref_tail(dest);
if (dest_tail->child) {
struct vtn_ssa_value *val = vtn_create_ssa_value(b, dest_tail->type);
_vtn_local_load_store(b, true, dest, dest_tail, val);
nir_deref_array *deref = nir_deref_as_array(dest_tail->child);
assert(deref->deref.child == NULL);
if (deref->deref_array_type == nir_deref_array_type_direct)
val->def = vtn_vector_insert(b, val->def, src->def,
deref->base_offset);
else
val->def = vtn_vector_insert_dynamic(b, val->def, src->def,
deref->indirect.ssa);
_vtn_local_load_store(b, false, dest, dest_tail, val);
} else {
_vtn_local_load_store(b, false, dest, dest_tail, src);
}
}
/* This function recursively walks the given deref chain and replaces the
* given copy instruction with an equivalent sequence load/store
* operations.
*
* @copy_instr The copy instruction to replace; new instructions will be
* inserted before this one
*
* @dest_head The head of the destination variable deref chain
*
* @src_head The head of the source variable deref chain
*
* @dest_tail The current tail of the destination variable deref chain;
* this is used for recursion and external callers of this
* function should call it with tail == head
*
* @src_tail The current tail of the source variable deref chain;
* this is used for recursion and external callers of this
* function should call it with tail == head
*
* @state The current variable lowering state
*/
static void
emit_copy_load_store(nir_intrinsic_instr *copy_instr,
nir_deref_var *dest_head, nir_deref_var *src_head,
nir_deref *dest_tail, nir_deref *src_tail, void *mem_ctx)
{
/* Find the next pair of wildcards */
nir_deref *src_arr_parent = deref_next_wildcard_parent(src_tail);
nir_deref *dest_arr_parent = deref_next_wildcard_parent(dest_tail);
if (src_arr_parent || dest_arr_parent) {
/* Wildcards had better come in matched pairs */
assert(dest_arr_parent && dest_arr_parent);
nir_deref_array *src_arr = nir_deref_as_array(src_arr_parent->child);
nir_deref_array *dest_arr = nir_deref_as_array(dest_arr_parent->child);
unsigned length = glsl_get_length(src_arr_parent->type);
/* The wildcards should represent the same number of elements */
assert(length == glsl_get_length(dest_arr_parent->type));
assert(length > 0);
/* Walk over all of the elements that this wildcard refers to and
* call emit_copy_load_store on each one of them */
src_arr->deref_array_type = nir_deref_array_type_direct;
dest_arr->deref_array_type = nir_deref_array_type_direct;
for (unsigned i = 0; i < length; i++) {
src_arr->base_offset = i;
dest_arr->base_offset = i;
emit_copy_load_store(copy_instr, dest_head, src_head,
&dest_arr->deref, &src_arr->deref, mem_ctx);
}
src_arr->deref_array_type = nir_deref_array_type_wildcard;
dest_arr->deref_array_type = nir_deref_array_type_wildcard;
} else {
/* In this case, we have no wildcards anymore, so all we have to do
* is just emit the load and store operations. */
src_tail = get_deref_tail(src_tail);
dest_tail = get_deref_tail(dest_tail);
assert(src_tail->type == dest_tail->type);
unsigned num_components = glsl_get_vector_elements(src_tail->type);
nir_intrinsic_instr *load =
nir_intrinsic_instr_create(mem_ctx, nir_intrinsic_load_var);
load->num_components = num_components;
load->variables[0] = nir_deref_as_var(nir_copy_deref(load, &src_head->deref));
nir_ssa_dest_init(&load->instr, &load->dest, num_components, NULL);
nir_instr_insert_before(©_instr->instr, &load->instr);
nir_intrinsic_instr *store =
nir_intrinsic_instr_create(mem_ctx, nir_intrinsic_store_var);
store->num_components = num_components;
store->variables[0] = nir_deref_as_var(nir_copy_deref(store, &dest_head->deref));
store->src[0].is_ssa = true;
store->src[0].ssa = &load->dest.ssa;
nir_instr_insert_before(©_instr->instr, &store->instr);
}
}