--- /dev/null
+/*
+ * Copyright © 2022 Collabora Ltd
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ * Authors:
+ * Gert Wollny <gert.wollny@collabora.com>
+ */
+
+#include "nir.h"
+#include "nir_builder.h"
+
+#include "nir_deref.h"
+#include "util/hash_table.h"
+
+/* This pass splits stores to and loads from 64 bit vec3
+ * and vec4 local variables to use at most vec2, and it also
+ * splits phi nodes accordingly.
+ *
+ * Arrays of vec3 and vec4 are handled directly, arrays of arrays
+ * are lowered to arrays on the fly.
+ */
+
+static bool
+nir_split_64bit_vec3_and_vec4_filter(const nir_instr *instr,
+ const void *data)
+{
+ switch (instr->type) {
+ case nir_instr_type_intrinsic: {
+ nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);
+
+ switch (intr->intrinsic) {
+ case nir_intrinsic_load_deref: {
+ if (nir_dest_bit_size(intr->dest) != 64)
+ return false;
+ nir_variable *var = nir_intrinsic_get_var(intr, 0);
+ if (var->data.mode != nir_var_function_temp)
+ return false;
+ return nir_dest_num_components(intr->dest) >= 3;
+ }
+ case nir_intrinsic_store_deref: {
+ if (nir_src_bit_size(intr->src[1]) != 64)
+ return false;
+ nir_variable *var = nir_intrinsic_get_var(intr, 0);
+ if (var->data.mode != nir_var_function_temp)
+ return false;
+ return nir_src_num_components(intr->src[1]) >= 3;
+ default:
+ return false;
+ }
+ }
+ }
+ case nir_instr_type_phi: {
+ nir_phi_instr *phi = nir_instr_as_phi(instr);
+ if (nir_dest_bit_size(phi->dest) != 64)
+ return false;
+ return nir_dest_num_components(phi->dest) >= 3;
+ }
+
+ default:
+ return false;
+ }
+}
+
+typedef struct {
+ nir_variable *xy;
+ nir_variable *zw;
+} variable_pair;
+
+
+static nir_ssa_def *
+merge_to_vec3_or_vec4(nir_builder *b, nir_ssa_def *load1,
+ nir_ssa_def *load2)
+{
+ assert(load2->num_components > 0 && load2->num_components < 3);
+
+ if (load2->num_components == 1)
+ return nir_vec3(b, nir_channel(b, load1, 0),
+ nir_channel(b, load1, 1),
+ nir_channel(b, load2, 0));
+ else
+ return nir_vec4(b, nir_channel(b, load1, 0),
+ nir_channel(b, load1, 1),
+ nir_channel(b, load2, 0),
+ nir_channel(b, load2, 1));
+}
+
+static nir_ssa_def *
+get_linear_array_offset(nir_builder *b, nir_deref_instr *deref)
+{
+ nir_deref_path path;
+ nir_deref_path_init(&path, deref, NULL);
+
+ nir_ssa_def *offset = nir_imm_intN_t(b, 0, deref->dest.ssa.bit_size);
+ for (nir_deref_instr **p = &path.path[1]; *p; p++) {
+ switch ((*p)->deref_type) {
+ case nir_deref_type_array: {
+ nir_ssa_def *index = nir_ssa_for_src(b, (*p)->arr.index, 1);
+ int stride = glsl_array_size((*p)->type);
+ if (stride >= 0)
+ offset = nir_iadd(b, offset, nir_amul_imm(b, index, stride));
+ else
+ offset = nir_iadd(b, offset, index);
+ break;
+ }
+ default:
+ unreachable("Not part of the path");
+ }
+ }
+ nir_deref_path_finish(&path);
+ return offset;
+}
+
+
+static variable_pair *
+get_var_pair(nir_builder *b, nir_variable *old_var,
+ struct hash_table *split_vars)
+{
+ variable_pair *new_var = NULL;
+ unsigned old_components = glsl_get_components(
+ glsl_without_array_or_matrix(old_var->type));
+
+ assert(old_components > 2 && old_components <= 4);
+
+ struct hash_entry *entry = _mesa_hash_table_search(split_vars, old_var);
+ if (!entry) {
+ new_var = (variable_pair *)calloc(1, sizeof(variable_pair));
+ new_var->xy = nir_variable_clone(old_var, b->shader);
+ new_var->zw = nir_variable_clone(old_var, b->shader);
+ new_var->xy->type = glsl_dvec_type(2);
+ new_var->zw->type = glsl_dvec_type(old_components - 2);
+
+ if (glsl_type_is_array(old_var->type)) {
+ unsigned array_size = glsl_get_aoa_size(old_var->type);
+ new_var->xy->type = glsl_array_type(new_var->xy->type,
+ array_size, 0);
+ new_var->zw->type = glsl_array_type(new_var->zw->type,
+ array_size, 0);
+ }
+
+ exec_list_push_tail(&b->impl->locals, &new_var->xy->node);
+ exec_list_push_tail(&b->impl->locals, &new_var->zw->node);
+
+ _mesa_hash_table_insert(split_vars, old_var, new_var);
+ } else
+ new_var = (variable_pair *)entry->data;
+ return new_var;
+}
+
+static nir_ssa_def *
+split_load_deref(nir_builder *b, nir_intrinsic_instr *intr,
+ nir_ssa_def *offset, struct hash_table *split_vars)
+{
+ nir_variable *old_var = nir_intrinsic_get_var(intr, 0);
+ unsigned old_components = glsl_get_components(
+ glsl_without_array_or_matrix(old_var->type));
+
+ variable_pair *vars = get_var_pair(b, old_var, split_vars);
+
+ nir_deref_instr *deref1 = nir_build_deref_var(b, vars->xy);
+ nir_deref_instr *deref2 = nir_build_deref_var(b, vars->zw);
+
+ if (offset) {
+ deref1 = nir_build_deref_array(b, deref1, offset);
+ deref2 = nir_build_deref_array(b, deref2, offset);
+ }
+
+ nir_ssa_def *load1 = nir_build_load_deref(b, 2, 64, &deref1->dest.ssa, 0);
+ nir_ssa_def *load2 = nir_build_load_deref(b, old_components - 2, 64,
+ &deref2->dest.ssa, 0);
+
+ return merge_to_vec3_or_vec4(b, load1, load2);
+}
+
+static nir_ssa_def *
+split_store_deref(nir_builder *b, nir_intrinsic_instr *intr,
+ nir_ssa_def *offset, struct hash_table *split_vars)
+{
+ nir_variable *old_var = nir_intrinsic_get_var(intr, 0);
+
+ variable_pair *vars = get_var_pair(b, old_var, split_vars);
+
+ nir_deref_instr *deref_xy = nir_build_deref_var(b, vars->xy);
+ nir_deref_instr *deref_zw = nir_build_deref_var(b, vars->zw);
+
+ if (offset) {
+ deref_xy = nir_build_deref_array(b, deref_xy, offset);
+ deref_zw = nir_build_deref_array(b, deref_zw, offset);
+ }
+
+ int write_mask_xy = nir_intrinsic_write_mask(intr) & 3;
+ if (write_mask_xy) {
+ nir_ssa_def *src_xy = nir_channels(b, intr->src[1].ssa, 3);
+ nir_build_store_deref(b, &deref_xy->dest.ssa, src_xy, write_mask_xy);
+ }
+
+ int write_mask_zw = nir_intrinsic_write_mask(intr) & 0xc;
+ if (write_mask_zw) {
+ nir_ssa_def *src_zw = nir_channels(b, intr->src[1].ssa, write_mask_zw);
+ nir_build_store_deref(b, &deref_zw->dest.ssa, src_zw, write_mask_zw >> 2);
+ }
+
+ return NIR_LOWER_INSTR_PROGRESS_REPLACE;
+}
+
+static nir_ssa_def *
+split_phi(nir_builder *b, nir_phi_instr *phi)
+{
+ nir_op vec_op = nir_op_vec(phi->dest.ssa.num_components);
+
+ nir_alu_instr *vec = nir_alu_instr_create(b->shader, vec_op);
+ nir_ssa_dest_init(&vec->instr, &vec->dest.dest,
+ phi->dest.ssa.num_components,
+ 64, NULL);
+ vec->dest.write_mask = (1 << phi->dest.ssa.num_components) - 1;
+
+ int num_comp[2] = {2, phi->dest.ssa.num_components - 2};
+
+ nir_phi_instr *new_phi[2];
+
+ for (unsigned i = 0; i < 2; i++) {
+ new_phi[i] = nir_phi_instr_create(b->shader);
+ nir_ssa_dest_init(&new_phi[i]->instr, &new_phi[i]->dest, num_comp[i],
+ phi->dest.ssa.bit_size, NULL);
+
+ nir_foreach_phi_src(src, phi) {
+ /* Insert at the end of the predecessor but before the jump
+ * (This was inspired by nir_lower_phi_to_scalar) */
+ nir_instr *pred_last_instr = nir_block_last_instr(src->pred);
+
+ if (pred_last_instr && pred_last_instr->type == nir_instr_type_jump)
+ b->cursor = nir_before_instr(pred_last_instr);
+ else
+ b->cursor = nir_after_block(src->pred);
+
+ nir_ssa_def *new_src = nir_channels(b, src->src.ssa,
+ ((1 << num_comp[i]) - 1) << (2 * i));
+
+ nir_phi_instr_add_src(new_phi[i], src->pred, nir_src_for_ssa(new_src));
+ }
+ nir_instr_insert_before(&phi->instr, &new_phi[i]->instr);
+ }
+
+ b->cursor = nir_after_instr(&phi->instr);
+ return merge_to_vec3_or_vec4(b, &new_phi[0]->dest.ssa, &new_phi[1]->dest.ssa);
+};
+
+static nir_ssa_def *
+nir_split_64bit_vec3_and_vec4_impl(nir_builder *b, nir_instr *instr, void *d)
+{
+ struct hash_table *split_vars = (struct hash_table *)d;
+
+ switch (instr->type) {
+
+ case nir_instr_type_intrinsic: {
+
+ nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);
+ switch (intr->intrinsic) {
+
+ case nir_intrinsic_load_deref: {
+ nir_deref_instr *deref =
+ nir_instr_as_deref(intr->src[0].ssa->parent_instr);
+ if (deref->deref_type == nir_deref_type_var)
+ return split_load_deref(b, intr, NULL, split_vars);
+ else if (deref->deref_type == nir_deref_type_array) {
+ return split_load_deref(b, intr, get_linear_array_offset(b, deref), split_vars);
+ }
+ else
+ unreachable("Only splitting of loads from vars and arrays");
+ }
+
+ case nir_intrinsic_store_deref: {
+ nir_deref_instr *deref =
+ nir_instr_as_deref(intr->src[0].ssa->parent_instr);
+ if (deref->deref_type == nir_deref_type_var)
+ return split_store_deref(b, intr, NULL, split_vars);
+ else if (deref->deref_type == nir_deref_type_array)
+ return split_store_deref(b, intr, get_linear_array_offset(b, deref), split_vars);
+ else
+ unreachable("Only splitting of stores to vars and arrays");
+ }
+
+ default:
+ unreachable("Only splitting load_deref and store_deref");
+ }
+ }
+
+ case nir_instr_type_phi: {
+ nir_phi_instr *phi = nir_instr_as_phi(instr);
+ return split_phi(b, phi);
+ }
+
+ default:
+ unreachable("Only splitting load_deref/store_deref and phi");
+ }
+
+ return NULL;
+}
+
+
+bool
+nir_split_64bit_vec3_and_vec4(nir_shader *sh)
+{
+ struct hash_table *split_vars = _mesa_pointer_hash_table_create(NULL);
+
+ bool progress =
+ nir_shader_lower_instructions(sh,
+ nir_split_64bit_vec3_and_vec4_filter,
+ nir_split_64bit_vec3_and_vec4_impl,
+ split_vars);
+
+ _mesa_hash_table_destroy(split_vars, NULL);
+ return progress;
+}
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