aboutsummaryrefslogtreecommitdiff
path: root/mesalib/src/glsl/opt_constant_variable.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'mesalib/src/glsl/opt_constant_variable.cpp')
-rw-r--r--mesalib/src/glsl/opt_constant_variable.cpp399
1 files changed, 201 insertions, 198 deletions
diff --git a/mesalib/src/glsl/opt_constant_variable.cpp b/mesalib/src/glsl/opt_constant_variable.cpp
index fedae851f..1f51da6e4 100644
--- a/mesalib/src/glsl/opt_constant_variable.cpp
+++ b/mesalib/src/glsl/opt_constant_variable.cpp
@@ -1,198 +1,201 @@
-/*
- * Copyright © 2010 Intel Corporation
- *
- * 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.
- */
-
-/**
- * \file opt_constant_variable.cpp
- *
- * Marks variables assigned a single constant value over the course
- * of the program as constant.
- *
- * The goal here is to trigger further constant folding and then dead
- * code elimination. This is common with vector/matrix constructors
- * and calls to builtin functions.
- */
-
-#include "ir.h"
-#include "ir_visitor.h"
-#include "ir_optimization.h"
-#include "glsl_types.h"
-
-struct assignment_entry {
- exec_node link;
- int assignment_count;
- ir_variable *var;
- ir_constant *constval;
- bool our_scope;
-};
-
-class ir_constant_variable_visitor : public ir_hierarchical_visitor {
-public:
- virtual ir_visitor_status visit_enter(ir_dereference_variable *);
- virtual ir_visitor_status visit(ir_variable *);
- virtual ir_visitor_status visit_enter(ir_assignment *);
- virtual ir_visitor_status visit_enter(ir_call *);
-
- exec_list list;
-};
-
-static struct assignment_entry *
-get_assignment_entry(ir_variable *var, exec_list *list)
-{
- struct assignment_entry *entry;
-
- foreach_list_typed(struct assignment_entry, entry, link, list) {
- if (entry->var == var)
- return entry;
- }
-
- entry = (struct assignment_entry *)calloc(1, sizeof(*entry));
- entry->var = var;
- list->push_head(&entry->link);
- return entry;
-}
-
-ir_visitor_status
-ir_constant_variable_visitor::visit(ir_variable *ir)
-{
- struct assignment_entry *entry = get_assignment_entry(ir, &this->list);
- entry->our_scope = true;
- return visit_continue;
-}
-
-/* Skip derefs of variables so that we can detect declarations. */
-ir_visitor_status
-ir_constant_variable_visitor::visit_enter(ir_dereference_variable *ir)
-{
- (void)ir;
- return visit_continue_with_parent;
-}
-
-ir_visitor_status
-ir_constant_variable_visitor::visit_enter(ir_assignment *ir)
-{
- ir_constant *constval;
- struct assignment_entry *entry;
-
- entry = get_assignment_entry(ir->lhs->variable_referenced(), &this->list);
- assert(entry);
- entry->assignment_count++;
-
- /* If it's already constant, don't do the work. */
- if (entry->var->constant_value)
- return visit_continue;
-
- /* OK, now find if we actually have all the right conditions for
- * this to be a constant value assigned to the var.
- */
- if (ir->condition) {
- constval = ir->condition->constant_expression_value();
- if (!constval || !constval->value.b[0])
- return visit_continue;
- }
-
- ir_variable *var = ir->whole_variable_written();
- if (!var)
- return visit_continue;
-
- constval = ir->rhs->constant_expression_value();
- if (!constval)
- return visit_continue;
-
- /* Mark this entry as having a constant assignment (if the
- * assignment count doesn't go >1). do_constant_variable will fix
- * up the variable with the constant value later.
- */
- entry->constval = constval;
-
- return visit_continue;
-}
-
-ir_visitor_status
-ir_constant_variable_visitor::visit_enter(ir_call *ir)
-{
- exec_list_iterator sig_iter = ir->get_callee()->parameters.iterator();
- foreach_iter(exec_list_iterator, iter, *ir) {
- ir_rvalue *param_rval = (ir_rvalue *)iter.get();
- ir_variable *param = (ir_variable *)sig_iter.get();
-
- if (param->mode == ir_var_out ||
- param->mode == ir_var_inout) {
- ir_variable *var = param_rval->variable_referenced();
- struct assignment_entry *entry;
-
- assert(var);
- entry = get_assignment_entry(var, &this->list);
- entry->assignment_count++;
- }
- sig_iter.next();
- }
- return visit_continue;
-}
-
-/**
- * Does a copy propagation pass on the code present in the instruction stream.
- */
-bool
-do_constant_variable(exec_list *instructions)
-{
- bool progress = false;
- ir_constant_variable_visitor v;
-
- v.run(instructions);
-
- while (!v.list.is_empty()) {
-
- struct assignment_entry *entry;
- entry = exec_node_data(struct assignment_entry, v.list.head, link);
-
- if (entry->assignment_count == 1 && entry->constval && entry->our_scope) {
- entry->var->constant_value = entry->constval;
- progress = true;
- }
- entry->link.remove();
- free(entry);
- }
-
- return progress;
-}
-
-bool
-do_constant_variable_unlinked(exec_list *instructions)
-{
- bool progress = false;
-
- foreach_iter(exec_list_iterator, iter, *instructions) {
- ir_instruction *ir = (ir_instruction *)iter.get();
- ir_function *f = ir->as_function();
- if (f) {
- foreach_iter(exec_list_iterator, sigiter, *f) {
- ir_function_signature *sig =
- (ir_function_signature *) sigiter.get();
- if (do_constant_variable(&sig->body))
- progress = true;
- }
- }
- }
-
- return progress;
-}
+/*
+ * Copyright © 2010 Intel Corporation
+ *
+ * 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.
+ */
+
+/**
+ * \file opt_constant_variable.cpp
+ *
+ * Marks variables assigned a single constant value over the course
+ * of the program as constant.
+ *
+ * The goal here is to trigger further constant folding and then dead
+ * code elimination. This is common with vector/matrix constructors
+ * and calls to builtin functions.
+ */
+
+#include "ir.h"
+#include "ir_visitor.h"
+#include "ir_optimization.h"
+#include "glsl_types.h"
+
+using std::calloc;
+using std::free;
+
+struct assignment_entry {
+ exec_node link;
+ int assignment_count;
+ ir_variable *var;
+ ir_constant *constval;
+ bool our_scope;
+};
+
+class ir_constant_variable_visitor : public ir_hierarchical_visitor {
+public:
+ virtual ir_visitor_status visit_enter(ir_dereference_variable *);
+ virtual ir_visitor_status visit(ir_variable *);
+ virtual ir_visitor_status visit_enter(ir_assignment *);
+ virtual ir_visitor_status visit_enter(ir_call *);
+
+ exec_list list;
+};
+
+static struct assignment_entry *
+get_assignment_entry(ir_variable *var, exec_list *list)
+{
+ struct assignment_entry *entry;
+
+ foreach_list_typed(struct assignment_entry, entry, link, list) {
+ if (entry->var == var)
+ return entry;
+ }
+
+ entry = (struct assignment_entry *)calloc(1, sizeof(*entry));
+ entry->var = var;
+ list->push_head(&entry->link);
+ return entry;
+}
+
+ir_visitor_status
+ir_constant_variable_visitor::visit(ir_variable *ir)
+{
+ struct assignment_entry *entry = get_assignment_entry(ir, &this->list);
+ entry->our_scope = true;
+ return visit_continue;
+}
+
+/* Skip derefs of variables so that we can detect declarations. */
+ir_visitor_status
+ir_constant_variable_visitor::visit_enter(ir_dereference_variable *ir)
+{
+ (void)ir;
+ return visit_continue_with_parent;
+}
+
+ir_visitor_status
+ir_constant_variable_visitor::visit_enter(ir_assignment *ir)
+{
+ ir_constant *constval;
+ struct assignment_entry *entry;
+
+ entry = get_assignment_entry(ir->lhs->variable_referenced(), &this->list);
+ assert(entry);
+ entry->assignment_count++;
+
+ /* If it's already constant, don't do the work. */
+ if (entry->var->constant_value)
+ return visit_continue;
+
+ /* OK, now find if we actually have all the right conditions for
+ * this to be a constant value assigned to the var.
+ */
+ if (ir->condition) {
+ constval = ir->condition->constant_expression_value();
+ if (!constval || !constval->value.b[0])
+ return visit_continue;
+ }
+
+ ir_variable *var = ir->whole_variable_written();
+ if (!var)
+ return visit_continue;
+
+ constval = ir->rhs->constant_expression_value();
+ if (!constval)
+ return visit_continue;
+
+ /* Mark this entry as having a constant assignment (if the
+ * assignment count doesn't go >1). do_constant_variable will fix
+ * up the variable with the constant value later.
+ */
+ entry->constval = constval;
+
+ return visit_continue;
+}
+
+ir_visitor_status
+ir_constant_variable_visitor::visit_enter(ir_call *ir)
+{
+ exec_list_iterator sig_iter = ir->get_callee()->parameters.iterator();
+ foreach_iter(exec_list_iterator, iter, *ir) {
+ ir_rvalue *param_rval = (ir_rvalue *)iter.get();
+ ir_variable *param = (ir_variable *)sig_iter.get();
+
+ if (param->mode == ir_var_out ||
+ param->mode == ir_var_inout) {
+ ir_variable *var = param_rval->variable_referenced();
+ struct assignment_entry *entry;
+
+ assert(var);
+ entry = get_assignment_entry(var, &this->list);
+ entry->assignment_count++;
+ }
+ sig_iter.next();
+ }
+ return visit_continue;
+}
+
+/**
+ * Does a copy propagation pass on the code present in the instruction stream.
+ */
+bool
+do_constant_variable(exec_list *instructions)
+{
+ bool progress = false;
+ ir_constant_variable_visitor v;
+
+ v.run(instructions);
+
+ while (!v.list.is_empty()) {
+
+ struct assignment_entry *entry;
+ entry = exec_node_data(struct assignment_entry, v.list.head, link);
+
+ if (entry->assignment_count == 1 && entry->constval && entry->our_scope) {
+ entry->var->constant_value = entry->constval;
+ progress = true;
+ }
+ entry->link.remove();
+ free(entry);
+ }
+
+ return progress;
+}
+
+bool
+do_constant_variable_unlinked(exec_list *instructions)
+{
+ bool progress = false;
+
+ foreach_iter(exec_list_iterator, iter, *instructions) {
+ ir_instruction *ir = (ir_instruction *)iter.get();
+ ir_function *f = ir->as_function();
+ if (f) {
+ foreach_iter(exec_list_iterator, sigiter, *f) {
+ ir_function_signature *sig =
+ (ir_function_signature *) sigiter.get();
+ if (do_constant_variable(&sig->body))
+ progress = true;
+ }
+ }
+ }
+
+ return progress;
+}