svn merge ^/branches/released .

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;
+}