libX11 mesa xkeyboard-config libXmu libXext libXdmcp libxtrans x11proto git update 13 Jun 2011

1 files changed, 204 insertions, 190 deletions

diff --git a/mesalib/src/glsl/opt_discard_simplification.cpp b/mesalib/src/glsl/opt_discard_simplification.cpp
index 37622eb02..a19947ddd 100644
--- a/mesalib/src/glsl/opt_discard_simplification.cpp
+++ b/mesalib/src/glsl/opt_discard_simplification.cpp
@@ -1,190 +1,204 @@
-/*

- * 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_discard_simplification.cpp

- *

- * This pass simplifies if-statements and loops containing unconditional

- * discards.

- *

- * Case 1: Both branches contain unconditional discards:

- * -----------------------------------------------------

- *

- *    if (cond) {

- *	 s1;

- *	 discard;

- *	 s2;

- *    } else {

- *	 s3;

- *	 discard;

- *	 s4;

- *    }

- *

- * becomes:

- *

- *    discard

- *

- * Case 2: The "then" clause contains an unconditional discard:

- * ------------------------------------------------------------

- *

- *    if (cond) {

- *       s1;

- *       discard;

- *       s2;

- *    } else {

- *	 s3;

- *    }

- *

- * becomes:

- *

- *    if (cond) {

- *	 discard;

- *    } else {

- *	 s3;

- *    }

- *

- * Case 3: The "else" clause contains an unconditional discard:

- * ------------------------------------------------------------

- *

- *    if (cond) {

- *       s1;

- *    } else {

- *       s2;

- *       discard;

- *	 s3;

- *    }

- *

- * becomes:

- *

- *    if (cond) {

- *	 s1;

- *    } else {

- *	 discard;

- *    }

- */

-

-#include "glsl_types.h"

-#include "ir.h"

-

-class discard_simplifier : public ir_hierarchical_visitor {

-public:

-   discard_simplifier()

-   {

-      this->progress = false;

-   }

-

-   ir_visitor_status visit_enter(ir_if *);

-   ir_visitor_status visit_enter(ir_loop *);

-   ir_visitor_status visit_enter(ir_assignment *);

-

-   bool progress;

-};

-

-static ir_discard *

-find_unconditional_discard(exec_list &instructions)

-{

-   foreach_list(n, &instructions) {

-      ir_discard *ir = ((ir_instruction *) n)->as_discard();

-      if (ir != NULL && ir->condition == NULL)

-	 return ir;

-   }

-   return NULL;

-}

-

-static bool

-is_only_instruction(ir_discard *discard)

-{

-   return (discard->prev->is_head_sentinel() &&

-	   discard->next->is_tail_sentinel());

-}

-

-/* We only care about the top level instructions, so don't descend

- * into expressions.

- */

-ir_visitor_status

-discard_simplifier::visit_enter(ir_assignment *ir)

-{

-   return visit_continue_with_parent;

-}

-

-ir_visitor_status

-discard_simplifier::visit_enter(ir_if *ir)

-{

-   ir_discard *then_discard = find_unconditional_discard(ir->then_instructions);

-   ir_discard *else_discard = find_unconditional_discard(ir->else_instructions);

-

-   if (then_discard == NULL && else_discard == NULL)

-      return visit_continue;

-

-   /* If both branches result in discard, replace whole if with discard. */

-   if (then_discard != NULL && else_discard != NULL) {

-      this->progress = true;

-      ir->replace_with(then_discard);

-      return visit_continue_with_parent;

-   }

-

-   /* Otherwise, one branch has a discard. */

-   if (then_discard != NULL && !is_only_instruction(then_discard)) {

-      this->progress = true;

-      ir->then_instructions.make_empty();

-      ir->then_instructions.push_tail(then_discard);

-   } else if (else_discard != NULL && !is_only_instruction(else_discard)) {

-      this->progress = true;

-      ir->else_instructions.make_empty();

-      ir->else_instructions.push_tail(else_discard);

-   }

-

-   visit_list_elements(this, &ir->then_instructions);

-   return visit_continue_with_parent;

-}

-

-ir_visitor_status

-discard_simplifier::visit_enter(ir_loop *ir)

-{

-   ir_discard *discard = find_unconditional_discard(ir->body_instructions);

-

-   if (discard) {

-      ir->replace_with(discard);

-      return visit_continue_with_parent;

-   }

-

-   return visit_continue;

-}

-

-bool

-do_discard_simplification(exec_list *instructions)

-{

-   /* Look for a top-level unconditional discard */

-   ir_discard *discard = find_unconditional_discard(*instructions);

-   if (discard != NULL) {

-      instructions->make_empty();

-      instructions->push_tail(discard);

-      return true;

-   }

-

-   discard_simplifier v;

-

-   visit_list_elements(&v, instructions);

-

-   return v.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_discard_simplification.cpp
+ *
+ * This pass simplifies if-statements and loops containing unconditional
+ * discards.
+ *
+ * Case 1: Both branches contain unconditional discards:
+ * -----------------------------------------------------
+ *
+ *    if (cond) {
+ *	 s1;
+ *	 discard;
+ *	 s2;
+ *    } else {
+ *	 s3;
+ *	 discard;
+ *	 s4;
+ *    }
+ *
+ * becomes:
+ *
+ *    discard
+ *
+ * Case 2: The "then" clause contains an unconditional discard:
+ * ------------------------------------------------------------
+ *
+ *    if (cond) {
+ *       s1;
+ *       discard;
+ *       s2;
+ *    } else {
+ *	 s3;
+ *    }
+ *
+ * becomes:
+ *
+ *    if (cond) {
+ *	 discard;
+ *    } else {
+ *	 s3;
+ *    }
+ *
+ * Case 3: The "else" clause contains an unconditional discard:
+ * ------------------------------------------------------------
+ *
+ *    if (cond) {
+ *       s1;
+ *    } else {
+ *       s2;
+ *       discard;
+ *	 s3;
+ *    }
+ *
+ * becomes:
+ *
+ *    if (cond) {
+ *	 s1;
+ *    } else {
+ *	 discard;
+ *    }
+ */
+
+#include "glsl_types.h"
+#include "ir.h"
+
+class discard_simplifier : public ir_hierarchical_visitor {
+public:
+   discard_simplifier()
+   {
+      this->progress = false;
+   }
+
+   ir_visitor_status visit_enter(ir_if *);
+   ir_visitor_status visit_enter(ir_loop *);
+   ir_visitor_status visit_enter(ir_assignment *);
+
+   bool progress;
+};
+
+static ir_discard *
+find_unconditional_discard(exec_list &instructions)
+{
+   foreach_list(n, &instructions) {
+      ir_instruction *ir = (ir_instruction *)n;
+
+      if (ir->ir_type == ir_type_return ||
+	  ir->ir_type == ir_type_loop_jump)
+	 return NULL;
+
+      /* So far, this code doesn't know how to look inside of flow
+       * control to see if a discard later on at this level is
+       * unconditional.
+       */
+      if (ir->ir_type == ir_type_if ||
+	  ir->ir_type == ir_type_loop)
+	 return NULL;
+
+      ir_discard *discard = ir->as_discard();
+      if (discard != NULL && discard->condition == NULL)
+	 return discard;
+   }
+   return NULL;
+}
+
+static bool
+is_only_instruction(ir_discard *discard)
+{
+   return (discard->prev->is_head_sentinel() &&
+	   discard->next->is_tail_sentinel());
+}
+
+/* We only care about the top level instructions, so don't descend
+ * into expressions.
+ */
+ir_visitor_status
+discard_simplifier::visit_enter(ir_assignment *ir)
+{
+   return visit_continue_with_parent;
+}
+
+ir_visitor_status
+discard_simplifier::visit_enter(ir_if *ir)
+{
+   ir_discard *then_discard = find_unconditional_discard(ir->then_instructions);
+   ir_discard *else_discard = find_unconditional_discard(ir->else_instructions);
+
+   if (then_discard == NULL && else_discard == NULL)
+      return visit_continue;
+
+   /* If both branches result in discard, replace whole if with discard. */
+   if (then_discard != NULL && else_discard != NULL) {
+      this->progress = true;
+      ir->replace_with(then_discard);
+      return visit_continue_with_parent;
+   }
+
+   /* Otherwise, one branch has a discard. */
+   if (then_discard != NULL && !is_only_instruction(then_discard)) {
+      this->progress = true;
+      ir->then_instructions.make_empty();
+      ir->then_instructions.push_tail(then_discard);
+   } else if (else_discard != NULL && !is_only_instruction(else_discard)) {
+      this->progress = true;
+      ir->else_instructions.make_empty();
+      ir->else_instructions.push_tail(else_discard);
+   }
+
+   visit_list_elements(this, &ir->then_instructions);
+   return visit_continue_with_parent;
+}
+
+ir_visitor_status
+discard_simplifier::visit_enter(ir_loop *ir)
+{
+   ir_discard *discard = find_unconditional_discard(ir->body_instructions);
+
+   if (discard) {
+      ir->replace_with(discard);
+      return visit_continue_with_parent;
+   }
+
+   return visit_continue;
+}
+
+bool
+do_discard_simplification(exec_list *instructions)
+{
+   /* Look for a top-level unconditional discard */
+   ir_discard *discard = find_unconditional_discard(*instructions);
+   if (discard != NULL) {
+      instructions->make_empty();
+      instructions->push_tail(discard);
+      return true;
+   }
+
+   discard_simplifier v;
+
+   visit_list_elements(&v, instructions);
+
+   return v.progress;
+}