1 files changed, 222 insertions, 224 deletions
diff --git a/mesalib/src/glsl/opt_dead_code_local.cpp b/mesalib/src/glsl/opt_dead_code_local.cpp
index f67b46337..42e5e94c8 100644
--- a/mesalib/src/glsl/opt_dead_code_local.cpp
+++ b/mesalib/src/glsl/opt_dead_code_local.cpp
@@ -1,224 +1,222 @@
-/*
- * 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_dead_code_local.cpp
- *
- * Eliminates local dead assignments from the code.
- *
- * This operates on basic blocks, tracking assignments and finding if
- * they're used before the variable is completely reassigned.
- *
- * Compare this to ir_dead_code.cpp, which operates globally looking
- * for assignments to variables that are never read.
- */
-
-#include "ir.h"
-#include "ir_basic_block.h"
-#include "ir_optimization.h"
-#include "glsl_types.h"
-
-using std::printf;
-
-static bool debug = false;
-
-class assignment_entry : public exec_node
-{
-public:
-   assignment_entry(ir_variable *lhs, ir_instruction *ir)
-   {
-      assert(lhs);
-      assert(ir);
-      this->lhs = lhs;
-      this->ir = ir;
-   }
-
-   ir_variable *lhs;
-   ir_instruction *ir;
-};
-
-class kill_for_derefs_visitor : public ir_hierarchical_visitor {
-public:
-   kill_for_derefs_visitor(exec_list *assignments)
-   {
-      this->assignments = assignments;
-   }
-
-   virtual ir_visitor_status visit(ir_dereference_variable *ir)
-   {
-      ir_variable *const var = ir->variable_referenced();
-
-      foreach_iter(exec_list_iterator, iter, *this->assignments) {
-	 assignment_entry *entry = (assignment_entry *)iter.get();
-
-	 if (entry->lhs == var) {
-	    if (debug)
-	       printf("kill %s\n", entry->lhs->name);
-	    entry->remove();
-	 }
-      }
-
-      return visit_continue;
-   }
-
-private:
-   exec_list *assignments;
-};
-
-class array_index_visit : public ir_hierarchical_visitor {
-public:
-   array_index_visit(ir_hierarchical_visitor *v)
-   {
-      this->visitor = v;
-   }
-
-   virtual ir_visitor_status visit_enter(class ir_dereference_array *ir)
-   {
-      ir->array_index->accept(visitor);
-      return visit_continue;
-   }
-
-   static void run(ir_instruction *ir, ir_hierarchical_visitor *v)
-   {
-      array_index_visit top_visit(v);
-      ir->accept(& top_visit);
-   }
-
-   ir_hierarchical_visitor *visitor;
-};
-
-
-/**
- * Adds an entry to the available copy list if it's a plain assignment
- * of a variable to a variable.
- */
-static bool
-process_assignment(void *ctx, ir_assignment *ir, exec_list *assignments)
-{
-   ir_variable *var = NULL;
-   bool progress = false;
-   kill_for_derefs_visitor v(assignments);
-
-   /* Kill assignment entries for things used to produce this assignment. */
-   ir->rhs->accept(&v);
-   if (ir->condition) {
-      ir->condition->accept(&v);
-   }
-
-   /* Kill assignment enties used as array indices.
-    */
-   array_index_visit::run(ir->lhs, &v);
-   var = ir->lhs->variable_referenced();
-   assert(var);
-
-   /* Now, check if we did a whole-variable assignment. */
-   if (!ir->condition && (ir->whole_variable_written() != NULL)) {
-      /* We did a whole-variable assignment.  So, any instruction in
-       * the assignment list with the same LHS is dead.
-       */
-      if (debug)
-	 printf("looking for %s to remove\n", var->name);
-      foreach_iter(exec_list_iterator, iter, *assignments) {
-	 assignment_entry *entry = (assignment_entry *)iter.get();
-
-	 if (entry->lhs == var) {
-	    if (debug)
-	       printf("removing %s\n", var->name);
-	    entry->ir->remove();
-	    entry->remove();
-	    progress = true;
-	 }
-      }
-   }
-
-   /* Add this instruction to the assignment list available to be removed.
-    * But not if the assignment has other side effects.
-    */
-   if (ir_has_call(ir))
-      return progress;
-
-   assignment_entry *entry = new(ctx) assignment_entry(var, ir);
-   assignments->push_tail(entry);
-
-   if (debug) {
-      printf("add %s\n", var->name);
-
-      printf("current entries\n");
-      foreach_iter(exec_list_iterator, iter, *assignments) {
-	 assignment_entry *entry = (assignment_entry *)iter.get();
-
-	 printf("    %s\n", entry->lhs->name);
-      }
-   }
-
-   return progress;
-}
-
-static void
-dead_code_local_basic_block(ir_instruction *first,
-			     ir_instruction *last,
-			     void *data)
-{
-   ir_instruction *ir, *ir_next;
-   /* List of avaialble_copy */
-   exec_list assignments;
-   bool *out_progress = (bool *)data;
-   bool progress = false;
-
-   void *ctx = ralloc_context(NULL);
-   /* Safe looping, since process_assignment */
-   for (ir = first, ir_next = (ir_instruction *)first->next;;
-	ir = ir_next, ir_next = (ir_instruction *)ir->next) {
-      ir_assignment *ir_assign = ir->as_assignment();
-
-      if (debug) {
-	 ir->print();
-	 printf("\n");
-      }
-
-      if (ir_assign) {
-	 progress = process_assignment(ctx, ir_assign, &assignments) || progress;
-      } else {
-	 kill_for_derefs_visitor kill(&assignments);
-	 ir->accept(&kill);
-      }
-
-      if (ir == last)
-	 break;
-   }
-   *out_progress = progress;
-   ralloc_free(ctx);
-}
-
-/**
- * Does a copy propagation pass on the code present in the instruction stream.
- */
-bool
-do_dead_code_local(exec_list *instructions)
-{
-   bool progress = false;
-
-   call_for_basic_blocks(instructions, dead_code_local_basic_block, &progress);
-
-   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_dead_code_local.cpp
+ *
+ * Eliminates local dead assignments from the code.
+ *
+ * This operates on basic blocks, tracking assignments and finding if
+ * they're used before the variable is completely reassigned.
+ *
+ * Compare this to ir_dead_code.cpp, which operates globally looking
+ * for assignments to variables that are never read.
+ */
+
+#include "ir.h"
+#include "ir_basic_block.h"
+#include "ir_optimization.h"
+#include "glsl_types.h"
+
+static bool debug = false;
+
+class assignment_entry : public exec_node
+{
+public:
+   assignment_entry(ir_variable *lhs, ir_instruction *ir)
+   {
+      assert(lhs);
+      assert(ir);
+      this->lhs = lhs;
+      this->ir = ir;
+   }
+
+   ir_variable *lhs;
+   ir_instruction *ir;
+};
+
+class kill_for_derefs_visitor : public ir_hierarchical_visitor {
+public:
+   kill_for_derefs_visitor(exec_list *assignments)
+   {
+      this->assignments = assignments;
+   }
+
+   virtual ir_visitor_status visit(ir_dereference_variable *ir)
+   {
+      ir_variable *const var = ir->variable_referenced();
+
+      foreach_iter(exec_list_iterator, iter, *this->assignments) {
+	 assignment_entry *entry = (assignment_entry *)iter.get();
+
+	 if (entry->lhs == var) {
+	    if (debug)
+	       printf("kill %s\n", entry->lhs->name);
+	    entry->remove();
+	 }
+      }
+
+      return visit_continue;
+   }
+
+private:
+   exec_list *assignments;
+};
+
+class array_index_visit : public ir_hierarchical_visitor {
+public:
+   array_index_visit(ir_hierarchical_visitor *v)
+   {
+      this->visitor = v;
+   }
+
+   virtual ir_visitor_status visit_enter(class ir_dereference_array *ir)
+   {
+      ir->array_index->accept(visitor);
+      return visit_continue;
+   }
+
+   static void run(ir_instruction *ir, ir_hierarchical_visitor *v)
+   {
+      array_index_visit top_visit(v);
+      ir->accept(& top_visit);
+   }
+
+   ir_hierarchical_visitor *visitor;
+};
+
+
+/**
+ * Adds an entry to the available copy list if it's a plain assignment
+ * of a variable to a variable.
+ */
+static bool
+process_assignment(void *ctx, ir_assignment *ir, exec_list *assignments)
+{
+   ir_variable *var = NULL;
+   bool progress = false;
+   kill_for_derefs_visitor v(assignments);
+
+   /* Kill assignment entries for things used to produce this assignment. */
+   ir->rhs->accept(&v);
+   if (ir->condition) {
+      ir->condition->accept(&v);
+   }
+
+   /* Kill assignment enties used as array indices.
+    */
+   array_index_visit::run(ir->lhs, &v);
+   var = ir->lhs->variable_referenced();
+   assert(var);
+
+   /* Now, check if we did a whole-variable assignment. */
+   if (!ir->condition && (ir->whole_variable_written() != NULL)) {
+      /* We did a whole-variable assignment.  So, any instruction in
+       * the assignment list with the same LHS is dead.
+       */
+      if (debug)
+	 printf("looking for %s to remove\n", var->name);
+      foreach_iter(exec_list_iterator, iter, *assignments) {
+	 assignment_entry *entry = (assignment_entry *)iter.get();
+
+	 if (entry->lhs == var) {
+	    if (debug)
+	       printf("removing %s\n", var->name);
+	    entry->ir->remove();
+	    entry->remove();
+	    progress = true;
+	 }
+      }
+   }
+
+   /* Add this instruction to the assignment list available to be removed.
+    * But not if the assignment has other side effects.
+    */
+   if (ir_has_call(ir))
+      return progress;
+
+   assignment_entry *entry = new(ctx) assignment_entry(var, ir);
+   assignments->push_tail(entry);
+
+   if (debug) {
+      printf("add %s\n", var->name);
+
+      printf("current entries\n");
+      foreach_iter(exec_list_iterator, iter, *assignments) {
+	 assignment_entry *entry = (assignment_entry *)iter.get();
+
+	 printf("    %s\n", entry->lhs->name);
+      }
+   }
+
+   return progress;
+}
+
+static void
+dead_code_local_basic_block(ir_instruction *first,
+			     ir_instruction *last,
+			     void *data)
+{
+   ir_instruction *ir, *ir_next;
+   /* List of avaialble_copy */
+   exec_list assignments;
+   bool *out_progress = (bool *)data;
+   bool progress = false;
+
+   void *ctx = ralloc_context(NULL);
+   /* Safe looping, since process_assignment */
+   for (ir = first, ir_next = (ir_instruction *)first->next;;
+	ir = ir_next, ir_next = (ir_instruction *)ir->next) {
+      ir_assignment *ir_assign = ir->as_assignment();
+
+      if (debug) {
+	 ir->print();
+	 printf("\n");
+      }
+
+      if (ir_assign) {
+	 progress = process_assignment(ctx, ir_assign, &assignments) || progress;
+      } else {
+	 kill_for_derefs_visitor kill(&assignments);
+	 ir->accept(&kill);
+      }
+
+      if (ir == last)
+	 break;
+   }
+   *out_progress = progress;
+   ralloc_free(ctx);
+}
+
+/**
+ * Does a copy propagation pass on the code present in the instruction stream.
+ */
+bool
+do_dead_code_local(exec_list *instructions)
+{
+   bool progress = false;
+
+   call_for_basic_blocks(instructions, dead_code_local_basic_block, &progress);
+
+   return progress;
+}