+/*
+ * Copyright (c) 2020 Lima Project
+ *
+ * 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.
+ */
+
+#include "nir.h"
+#include "nir_builder.h"
+#include "lima_ir.h"
+
+static bool
+lima_nir_duplicate_load_const(nir_builder *b, nir_load_const_instr *load)
+{
+ nir_load_const_instr *last_dupl = NULL;
+ nir_instr *last_parent_instr = NULL;
+
+ nir_foreach_use_safe(use_src, &load->def) {
+ nir_load_const_instr *dupl;
+
+ if (last_parent_instr != use_src->parent_instr) {
+ /* if ssa use, clone for the target block */
+ b->cursor = nir_before_instr(use_src->parent_instr);
+
+ dupl = nir_load_const_instr_create(b->shader, load->def.num_components,
+ load->def.bit_size);
+ memcpy(&dupl->value, &load->value, sizeof(*load->value) * load->def.num_components);
+
+ dupl->instr.pass_flags = 1;
+ nir_builder_instr_insert(b, &dupl->instr);
+ }
+ else {
+ dupl = last_dupl;
+ }
+
+ nir_instr_rewrite_src(use_src->parent_instr, use_src, nir_src_for_ssa(&dupl->def));
+ last_parent_instr = use_src->parent_instr;
+ last_dupl = dupl;
+ }
+
+ last_dupl = NULL;
+ last_parent_instr = NULL;
+
+ nir_foreach_if_use_safe(use_src, &load->def) {
+ nir_load_const_instr *dupl;
+
+ if (last_parent_instr != use_src->parent_instr) {
+ /* if 'if use', clone where it is */
+ b->cursor = nir_before_instr(&load->instr);
+
+ dupl = nir_load_const_instr_create(b->shader, load->def.num_components,
+ load->def.bit_size);
+ memcpy(&dupl->value, &load->value, sizeof(*load->value) * load->def.num_components);
+
+ dupl->instr.pass_flags = 1;
+ nir_builder_instr_insert(b, &dupl->instr);
+ }
+ else {
+ dupl = last_dupl;
+ }
+
+ nir_if_rewrite_condition(use_src->parent_if, nir_src_for_ssa(&dupl->def));
+ last_parent_instr = use_src->parent_instr;
+ last_dupl = dupl;
+ }
+
+ nir_instr_remove(&load->instr);
+ return true;
+}
+
+static void
+lima_nir_duplicate_load_consts_impl(nir_shader *shader, nir_function_impl *impl)
+{
+ nir_builder builder;
+ nir_builder_init(&builder, impl);
+
+ nir_foreach_block(block, impl) {
+ nir_foreach_instr(instr, block) {
+ instr->pass_flags = 0;
+ }
+
+ nir_foreach_instr_safe(instr, block) {
+ if (instr->type != nir_instr_type_load_const)
+ continue;
+
+ nir_load_const_instr *load = nir_instr_as_load_const(instr);
+
+ if (load->instr.pass_flags)
+ continue;
+
+ lima_nir_duplicate_load_const(&builder, load);
+ }
+ }
+
+ nir_metadata_preserve(impl, nir_metadata_block_index |
+ nir_metadata_dominance);
+}
+
+/* Duplicate load consts for every user.
+ * Helps by utilizing the load const instruction slots that would
+ * otherwise stay empty, and reduces register pressure. */
+void
+lima_nir_duplicate_load_consts(nir_shader *shader)
+{
+ nir_foreach_function(function, shader) {
+ if (function->impl) {
+ lima_nir_duplicate_load_consts_impl(shader, function->impl);
+ }
+ }
+}
projects / mesa.git / commitdiff