svn merge ^/branches/released .

1 files changed, 467 insertions, 458 deletions

diff --git a/mesalib/src/glsl/opt_copy_propagation_elements.cpp b/mesalib/src/glsl/opt_copy_propagation_elements.cpp
index 8541d9a8e..580c10f27 100644
--- a/mesalib/src/glsl/opt_copy_propagation_elements.cpp
+++ b/mesalib/src/glsl/opt_copy_propagation_elements.cpp
@@ -1,458 +1,467 @@
-/*
- * 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_copy_propagation_elements.cpp
- *
- * Replaces usage of recently-copied components of variables with the
- * previous copy of the variable.
- *
- * This pass can be compared with opt_copy_propagation, which operands
- * on arbitrary whole-variable copies.  However, in order to handle
- * the copy propagation of swizzled variables or writemasked writes,
- * we want to track things on a channel-wise basis.  I found that
- * trying to mix the swizzled/writemasked support here with the
- * whole-variable stuff in opt_copy_propagation.cpp just made a mess,
- * so this is separate despite the ACP handling being somewhat
- * similar.
- *
- * This should reduce the number of MOV instructions in the generated
- * programs unless copy propagation is also done on the LIR, and may
- * help anyway by triggering other optimizations that live in the HIR.
- */
-
-#include "ir.h"
-#include "ir_rvalue_visitor.h"
-#include "ir_basic_block.h"
-#include "ir_optimization.h"
-#include "glsl_types.h"
-
-static bool debug = false;
-
-class acp_entry : public exec_node
-{
-public:
-   acp_entry(ir_variable *lhs, ir_variable *rhs, int write_mask, int swizzle[4])
-   {
-      this->lhs = lhs;
-      this->rhs = rhs;
-      this->write_mask = write_mask;
-      memcpy(this->swizzle, swizzle, sizeof(this->swizzle));
-   }
-
-   acp_entry(acp_entry *a)
-   {
-      this->lhs = a->lhs;
-      this->rhs = a->rhs;
-      this->write_mask = a->write_mask;
-      memcpy(this->swizzle, a->swizzle, sizeof(this->swizzle));
-   }
-
-   ir_variable *lhs;
-   ir_variable *rhs;
-   unsigned int write_mask;
-   int swizzle[4];
-};
-
-
-class kill_entry : public exec_node
-{
-public:
-   kill_entry(ir_variable *var, int write_mask)
-   {
-      this->var = var;
-      this->write_mask = write_mask;
-   }
-
-   ir_variable *var;
-   unsigned int write_mask;
-};
-
-class ir_copy_propagation_elements_visitor : public ir_rvalue_visitor {
-public:
-   ir_copy_propagation_elements_visitor()
-   {
-      this->progress = false;
-      this->mem_ctx = ralloc_context(NULL);
-      this->shader_mem_ctx = NULL;
-      this->acp = new(mem_ctx) exec_list;
-      this->kills = new(mem_ctx) exec_list;
-   }
-   ~ir_copy_propagation_elements_visitor()
-   {
-      ralloc_free(mem_ctx);
-   }
-
-   virtual ir_visitor_status visit_enter(class ir_loop *);
-   virtual ir_visitor_status visit_enter(class ir_function_signature *);
-   virtual ir_visitor_status visit_leave(class ir_assignment *);
-   virtual ir_visitor_status visit_enter(class ir_call *);
-   virtual ir_visitor_status visit_enter(class ir_if *);
-
-   void handle_rvalue(ir_rvalue **rvalue);
-
-   void add_copy(ir_assignment *ir);
-   void kill(kill_entry *k);
-   void handle_if_block(exec_list *instructions);
-
-   /** List of acp_entry: The available copies to propagate */
-   exec_list *acp;
-   /**
-    * List of kill_entry: The variables whose values were killed in this
-    * block.
-    */
-   exec_list *kills;
-
-   bool progress;
-
-   bool killed_all;
-
-   /* Context for our local data structures. */
-   void *mem_ctx;
-   /* Context for allocating new shader nodes. */
-   void *shader_mem_ctx;
-};
-
-ir_visitor_status
-ir_copy_propagation_elements_visitor::visit_enter(ir_function_signature *ir)
-{
-   /* Treat entry into a function signature as a completely separate
-    * block.  Any instructions at global scope will be shuffled into
-    * main() at link time, so they're irrelevant to us.
-    */
-   exec_list *orig_acp = this->acp;
-   exec_list *orig_kills = this->kills;
-   bool orig_killed_all = this->killed_all;
-
-   this->acp = new(mem_ctx) exec_list;
-   this->kills = new(mem_ctx) exec_list;
-   this->killed_all = false;
-
-   visit_list_elements(this, &ir->body);
-
-   this->kills = orig_kills;
-   this->acp = orig_acp;
-   this->killed_all = orig_killed_all;
-
-   return visit_continue_with_parent;
-}
-
-ir_visitor_status
-ir_copy_propagation_elements_visitor::visit_leave(ir_assignment *ir)
-{
-   ir_dereference_variable *lhs = ir->lhs->as_dereference_variable();
-
-   if (lhs && (lhs->type->is_scalar() || lhs->type->is_vector())) {
-      kill_entry *k = new(mem_ctx) kill_entry(lhs->var, ir->write_mask);
-      kill(k);
-   }
-
-   add_copy(ir);
-
-   return visit_continue;
-}
-
-/**
- * Replaces dereferences of ACP RHS variables with ACP LHS variables.
- *
- * This is where the actual copy propagation occurs.  Note that the
- * rewriting of ir_dereference means that the ir_dereference instance
- * must not be shared by multiple IR operations!
- */
-void
-ir_copy_propagation_elements_visitor::handle_rvalue(ir_rvalue **ir)
-{
-   int swizzle_chan[4];
-   ir_dereference_variable *deref_var;
-   ir_variable *source[4] = {NULL, NULL, NULL, NULL};
-   int source_chan[4];
-   int chans;
-
-   if (!*ir)
-      return;
-
-   ir_swizzle *swizzle = (*ir)->as_swizzle();
-   if (swizzle) {
-      deref_var = swizzle->val->as_dereference_variable();
-      if (!deref_var)
-	 return;
-
-      swizzle_chan[0] = swizzle->mask.x;
-      swizzle_chan[1] = swizzle->mask.y;
-      swizzle_chan[2] = swizzle->mask.z;
-      swizzle_chan[3] = swizzle->mask.w;
-      chans = swizzle->type->vector_elements;
-   } else {
-      deref_var = (*ir)->as_dereference_variable();
-      if (!deref_var)
-	 return;
-
-      swizzle_chan[0] = 0;
-      swizzle_chan[1] = 1;
-      swizzle_chan[2] = 2;
-      swizzle_chan[3] = 3;
-      chans = deref_var->type->vector_elements;
-   }
-
-   if (this->in_assignee)
-      return;
-
-   ir_variable *var = deref_var->var;
-
-   /* Try to find ACP entries covering swizzle_chan[], hoping they're
-    * the same source variable.
-    */
-   foreach_iter(exec_list_iterator, iter, *this->acp) {
-      acp_entry *entry = (acp_entry *)iter.get();
-
-      if (var == entry->lhs) {
-	 for (int c = 0; c < chans; c++) {
-	    if (entry->write_mask & (1 << swizzle_chan[c])) {
-	       source[c] = entry->rhs;
-	       source_chan[c] = entry->swizzle[swizzle_chan[c]];
-	    }
-	 }
-      }
-   }
-
-   /* Make sure all channels are copying from the same source variable. */
-   if (!source[0])
-      return;
-   for (int c = 1; c < chans; c++) {
-      if (source[c] != source[0])
-	 return;
-   }
-
-   if (!shader_mem_ctx)
-      shader_mem_ctx = ralloc_parent(deref_var);
-
-   if (debug) {
-      printf("Copy propagation from:\n");
-      (*ir)->print();
-   }
-
-   deref_var = new(shader_mem_ctx) ir_dereference_variable(source[0]);
-   *ir = new(shader_mem_ctx) ir_swizzle(deref_var,
-					source_chan[0],
-					source_chan[1],
-					source_chan[2],
-					source_chan[3],
-					chans);
-
-   if (debug) {
-      printf("to:\n");
-      (*ir)->print();
-      printf("\n");
-   }
-}
-
-
-ir_visitor_status
-ir_copy_propagation_elements_visitor::visit_enter(ir_call *ir)
-{
-   /* Do copy propagation on call parameters, but skip any out params */
-   exec_list_iterator sig_param_iter = ir->get_callee()->parameters.iterator();
-   foreach_iter(exec_list_iterator, iter, ir->actual_parameters) {
-      ir_variable *sig_param = (ir_variable *)sig_param_iter.get();
-      ir_instruction *ir = (ir_instruction *)iter.get();
-      if (sig_param->mode != ir_var_out && sig_param->mode != ir_var_inout) {
-         ir->accept(this);
-      }
-      sig_param_iter.next();
-   }
-
-   /* Since we're unlinked, we don't (necessarily) know the side effects of
-    * this call.  So kill all copies.
-    */
-   acp->make_empty();
-   this->killed_all = true;
-
-   return visit_continue_with_parent;
-}
-
-void
-ir_copy_propagation_elements_visitor::handle_if_block(exec_list *instructions)
-{
-   exec_list *orig_acp = this->acp;
-   exec_list *orig_kills = this->kills;
-   bool orig_killed_all = this->killed_all;
-
-   this->acp = new(mem_ctx) exec_list;
-   this->kills = new(mem_ctx) exec_list;
-   this->killed_all = false;
-
-   /* Populate the initial acp with a copy of the original */
-   foreach_iter(exec_list_iterator, iter, *orig_acp) {
-      acp_entry *a = (acp_entry *)iter.get();
-      this->acp->push_tail(new(this->mem_ctx) acp_entry(a));
-   }
-
-   visit_list_elements(this, instructions);
-
-   if (this->killed_all) {
-      orig_acp->make_empty();
-   }
-
-   exec_list *new_kills = this->kills;
-   this->kills = orig_kills;
-   this->acp = orig_acp;
-   this->killed_all = this->killed_all || orig_killed_all;
-
-   /* Move the new kills into the parent block's list, removing them
-    * from the parent's ACP list in the process.
-    */
-   foreach_list_safe(node, new_kills) {
-      kill_entry *k = (kill_entry *)node;
-      kill(k);
-   }
-}
-
-ir_visitor_status
-ir_copy_propagation_elements_visitor::visit_enter(ir_if *ir)
-{
-   ir->condition->accept(this);
-
-   handle_if_block(&ir->then_instructions);
-   handle_if_block(&ir->else_instructions);
-
-   /* handle_if_block() already descended into the children. */
-   return visit_continue_with_parent;
-}
-
-ir_visitor_status
-ir_copy_propagation_elements_visitor::visit_enter(ir_loop *ir)
-{
-   exec_list *orig_acp = this->acp;
-   exec_list *orig_kills = this->kills;
-   bool orig_killed_all = this->killed_all;
-
-   /* FINISHME: For now, the initial acp for loops is totally empty.
-    * We could go through once, then go through again with the acp
-    * cloned minus the killed entries after the first run through.
-    */
-   this->acp = new(mem_ctx) exec_list;
-   this->kills = new(mem_ctx) exec_list;
-   this->killed_all = false;
-
-   visit_list_elements(this, &ir->body_instructions);
-
-   if (this->killed_all) {
-      orig_acp->make_empty();
-   }
-
-   exec_list *new_kills = this->kills;
-   this->kills = orig_kills;
-   this->acp = orig_acp;
-   this->killed_all = this->killed_all || orig_killed_all;
-
-   foreach_list_safe(node, new_kills) {
-      kill_entry *k = (kill_entry *)node;
-      kill(k);
-   }
-
-   /* already descended into the children. */
-   return visit_continue_with_parent;
-}
-
-/* Remove any entries currently in the ACP for this kill. */
-void
-ir_copy_propagation_elements_visitor::kill(kill_entry *k)
-{
-   foreach_list_safe(node, acp) {
-      acp_entry *entry = (acp_entry *)node;
-
-      if (entry->lhs == k->var) {
-	 entry->write_mask = entry->write_mask & ~k->write_mask;
-	 if (entry->write_mask == 0)
-	    entry->remove();
-      }
-      if (entry->rhs == k->var) {
-	 entry->remove();
-      }
-   }
-
-   /* If we were on a list, remove ourselves before inserting */
-   if (k->next)
-      k->remove();
-
-   this->kills->push_tail(k);
-}
-
-/**
- * Adds directly-copied channels between vector variables to the available
- * copy propagation list.
- */
-void
-ir_copy_propagation_elements_visitor::add_copy(ir_assignment *ir)
-{
-   acp_entry *entry;
-   int orig_swizzle[4] = {0, 1, 2, 3};
-   int swizzle[4];
-
-   if (ir->condition)
-      return;
-
-   ir_dereference_variable *lhs = ir->lhs->as_dereference_variable();
-   if (!lhs || !(lhs->type->is_scalar() || lhs->type->is_vector()))
-      return;
-
-   ir_dereference_variable *rhs = ir->rhs->as_dereference_variable();
-   if (!rhs) {
-      ir_swizzle *swiz = ir->rhs->as_swizzle();
-      if (!swiz)
-	 return;
-
-      rhs = swiz->val->as_dereference_variable();
-      if (!rhs)
-	 return;
-
-      orig_swizzle[0] = swiz->mask.x;
-      orig_swizzle[1] = swiz->mask.y;
-      orig_swizzle[2] = swiz->mask.z;
-      orig_swizzle[3] = swiz->mask.w;
-   }
-
-   /* Move the swizzle channels out to the positions they match in the
-    * destination.  We don't want to have to rewrite the swizzle[]
-    * array every time we clear a bit of the write_mask.
-    */
-   int j = 0;
-   for (int i = 0; i < 4; i++) {
-      if (ir->write_mask & (1 << i))
-	 swizzle[i] = orig_swizzle[j++];
-   }
-
-   entry = new(this->mem_ctx) acp_entry(lhs->var, rhs->var, ir->write_mask,
-					swizzle);
-   this->acp->push_tail(entry);
-}
-
-bool
-do_copy_propagation_elements(exec_list *instructions)
-{
-   ir_copy_propagation_elements_visitor 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_copy_propagation_elements.cpp

+ *

+ * Replaces usage of recently-copied components of variables with the

+ * previous copy of the variable.

+ *

+ * This pass can be compared with opt_copy_propagation, which operands

+ * on arbitrary whole-variable copies.  However, in order to handle

+ * the copy propagation of swizzled variables or writemasked writes,

+ * we want to track things on a channel-wise basis.  I found that

+ * trying to mix the swizzled/writemasked support here with the

+ * whole-variable stuff in opt_copy_propagation.cpp just made a mess,

+ * so this is separate despite the ACP handling being somewhat

+ * similar.

+ *

+ * This should reduce the number of MOV instructions in the generated

+ * programs unless copy propagation is also done on the LIR, and may

+ * help anyway by triggering other optimizations that live in the HIR.

+ */

+

+#include "ir.h"

+#include "ir_rvalue_visitor.h"

+#include "ir_basic_block.h"

+#include "ir_optimization.h"

+#include "glsl_types.h"

+

+static bool debug = false;

+

+class acp_entry : public exec_node

+{

+public:

+   acp_entry(ir_variable *lhs, ir_variable *rhs, int write_mask, int swizzle[4])

+   {

+      this->lhs = lhs;

+      this->rhs = rhs;

+      this->write_mask = write_mask;

+      memcpy(this->swizzle, swizzle, sizeof(this->swizzle));

+   }

+

+   acp_entry(acp_entry *a)

+   {

+      this->lhs = a->lhs;

+      this->rhs = a->rhs;

+      this->write_mask = a->write_mask;

+      memcpy(this->swizzle, a->swizzle, sizeof(this->swizzle));

+   }

+

+   ir_variable *lhs;

+   ir_variable *rhs;

+   unsigned int write_mask;

+   int swizzle[4];

+};

+

+

+class kill_entry : public exec_node

+{

+public:

+   kill_entry(ir_variable *var, int write_mask)

+   {

+      this->var = var;

+      this->write_mask = write_mask;

+   }

+

+   ir_variable *var;

+   unsigned int write_mask;

+};

+

+class ir_copy_propagation_elements_visitor : public ir_rvalue_visitor {

+public:

+   ir_copy_propagation_elements_visitor()

+   {

+      this->progress = false;

+      this->mem_ctx = ralloc_context(NULL);

+      this->shader_mem_ctx = NULL;

+      this->acp = new(mem_ctx) exec_list;

+      this->kills = new(mem_ctx) exec_list;

+   }

+   ~ir_copy_propagation_elements_visitor()

+   {

+      ralloc_free(mem_ctx);

+   }

+

+   virtual ir_visitor_status visit_enter(class ir_loop *);

+   virtual ir_visitor_status visit_enter(class ir_function_signature *);

+   virtual ir_visitor_status visit_leave(class ir_assignment *);

+   virtual ir_visitor_status visit_enter(class ir_call *);

+   virtual ir_visitor_status visit_enter(class ir_if *);

+

+   void handle_rvalue(ir_rvalue **rvalue);

+

+   void add_copy(ir_assignment *ir);

+   void kill(kill_entry *k);

+   void handle_if_block(exec_list *instructions);

+

+   /** List of acp_entry: The available copies to propagate */

+   exec_list *acp;

+   /**

+    * List of kill_entry: The variables whose values were killed in this

+    * block.

+    */

+   exec_list *kills;

+

+   bool progress;

+

+   bool killed_all;

+

+   /* Context for our local data structures. */

+   void *mem_ctx;

+   /* Context for allocating new shader nodes. */

+   void *shader_mem_ctx;

+};

+

+ir_visitor_status

+ir_copy_propagation_elements_visitor::visit_enter(ir_function_signature *ir)

+{

+   /* Treat entry into a function signature as a completely separate

+    * block.  Any instructions at global scope will be shuffled into

+    * main() at link time, so they're irrelevant to us.

+    */

+   exec_list *orig_acp = this->acp;

+   exec_list *orig_kills = this->kills;

+   bool orig_killed_all = this->killed_all;

+

+   this->acp = new(mem_ctx) exec_list;

+   this->kills = new(mem_ctx) exec_list;

+   this->killed_all = false;

+

+   visit_list_elements(this, &ir->body);

+

+   this->kills = orig_kills;

+   this->acp = orig_acp;

+   this->killed_all = orig_killed_all;

+

+   return visit_continue_with_parent;

+}

+

+ir_visitor_status

+ir_copy_propagation_elements_visitor::visit_leave(ir_assignment *ir)

+{

+   ir_dereference_variable *lhs = ir->lhs->as_dereference_variable();

+   ir_variable *var = ir->lhs->variable_referenced();

+

+   if (var->type->is_scalar() || var->type->is_vector()) {

+      kill_entry *k;

+

+      if (lhs)

+	 k = new(mem_ctx) kill_entry(var, ir->write_mask);

+      else

+	 k = new(mem_ctx) kill_entry(var, ~0);

+

+      kill(k);

+   }

+

+   add_copy(ir);

+

+   return visit_continue;

+}

+

+/**

+ * Replaces dereferences of ACP RHS variables with ACP LHS variables.

+ *

+ * This is where the actual copy propagation occurs.  Note that the

+ * rewriting of ir_dereference means that the ir_dereference instance

+ * must not be shared by multiple IR operations!

+ */

+void

+ir_copy_propagation_elements_visitor::handle_rvalue(ir_rvalue **ir)

+{

+   int swizzle_chan[4];

+   ir_dereference_variable *deref_var;

+   ir_variable *source[4] = {NULL, NULL, NULL, NULL};

+   int source_chan[4];

+   int chans;

+

+   if (!*ir)

+      return;

+

+   ir_swizzle *swizzle = (*ir)->as_swizzle();

+   if (swizzle) {

+      deref_var = swizzle->val->as_dereference_variable();

+      if (!deref_var)

+	 return;

+

+      swizzle_chan[0] = swizzle->mask.x;

+      swizzle_chan[1] = swizzle->mask.y;

+      swizzle_chan[2] = swizzle->mask.z;

+      swizzle_chan[3] = swizzle->mask.w;

+      chans = swizzle->type->vector_elements;

+   } else {

+      deref_var = (*ir)->as_dereference_variable();

+      if (!deref_var)

+	 return;

+

+      swizzle_chan[0] = 0;

+      swizzle_chan[1] = 1;

+      swizzle_chan[2] = 2;

+      swizzle_chan[3] = 3;

+      chans = deref_var->type->vector_elements;

+   }

+

+   if (this->in_assignee)

+      return;

+

+   ir_variable *var = deref_var->var;

+

+   /* Try to find ACP entries covering swizzle_chan[], hoping they're

+    * the same source variable.

+    */

+   foreach_iter(exec_list_iterator, iter, *this->acp) {

+      acp_entry *entry = (acp_entry *)iter.get();

+

+      if (var == entry->lhs) {

+	 for (int c = 0; c < chans; c++) {

+	    if (entry->write_mask & (1 << swizzle_chan[c])) {

+	       source[c] = entry->rhs;

+	       source_chan[c] = entry->swizzle[swizzle_chan[c]];

+	    }

+	 }

+      }

+   }

+

+   /* Make sure all channels are copying from the same source variable. */

+   if (!source[0])

+      return;

+   for (int c = 1; c < chans; c++) {

+      if (source[c] != source[0])

+	 return;

+   }

+

+   if (!shader_mem_ctx)

+      shader_mem_ctx = ralloc_parent(deref_var);

+

+   if (debug) {

+      printf("Copy propagation from:\n");

+      (*ir)->print();

+   }

+

+   deref_var = new(shader_mem_ctx) ir_dereference_variable(source[0]);

+   *ir = new(shader_mem_ctx) ir_swizzle(deref_var,

+					source_chan[0],

+					source_chan[1],

+					source_chan[2],

+					source_chan[3],

+					chans);

+

+   if (debug) {

+      printf("to:\n");

+      (*ir)->print();

+      printf("\n");

+   }

+}

+

+

+ir_visitor_status

+ir_copy_propagation_elements_visitor::visit_enter(ir_call *ir)

+{

+   /* Do copy propagation on call parameters, but skip any out params */

+   exec_list_iterator sig_param_iter = ir->get_callee()->parameters.iterator();

+   foreach_iter(exec_list_iterator, iter, ir->actual_parameters) {

+      ir_variable *sig_param = (ir_variable *)sig_param_iter.get();

+      ir_instruction *ir = (ir_instruction *)iter.get();

+      if (sig_param->mode != ir_var_out && sig_param->mode != ir_var_inout) {

+         ir->accept(this);

+      }

+      sig_param_iter.next();

+   }

+

+   /* Since we're unlinked, we don't (necessarily) know the side effects of

+    * this call.  So kill all copies.

+    */

+   acp->make_empty();

+   this->killed_all = true;

+

+   return visit_continue_with_parent;

+}

+

+void

+ir_copy_propagation_elements_visitor::handle_if_block(exec_list *instructions)

+{

+   exec_list *orig_acp = this->acp;

+   exec_list *orig_kills = this->kills;

+   bool orig_killed_all = this->killed_all;

+

+   this->acp = new(mem_ctx) exec_list;

+   this->kills = new(mem_ctx) exec_list;

+   this->killed_all = false;

+

+   /* Populate the initial acp with a copy of the original */

+   foreach_iter(exec_list_iterator, iter, *orig_acp) {

+      acp_entry *a = (acp_entry *)iter.get();

+      this->acp->push_tail(new(this->mem_ctx) acp_entry(a));

+   }

+

+   visit_list_elements(this, instructions);

+

+   if (this->killed_all) {

+      orig_acp->make_empty();

+   }

+

+   exec_list *new_kills = this->kills;

+   this->kills = orig_kills;

+   this->acp = orig_acp;

+   this->killed_all = this->killed_all || orig_killed_all;

+

+   /* Move the new kills into the parent block's list, removing them

+    * from the parent's ACP list in the process.

+    */

+   foreach_list_safe(node, new_kills) {

+      kill_entry *k = (kill_entry *)node;

+      kill(k);

+   }

+}

+

+ir_visitor_status

+ir_copy_propagation_elements_visitor::visit_enter(ir_if *ir)

+{

+   ir->condition->accept(this);

+

+   handle_if_block(&ir->then_instructions);

+   handle_if_block(&ir->else_instructions);

+

+   /* handle_if_block() already descended into the children. */

+   return visit_continue_with_parent;

+}

+

+ir_visitor_status

+ir_copy_propagation_elements_visitor::visit_enter(ir_loop *ir)

+{

+   exec_list *orig_acp = this->acp;

+   exec_list *orig_kills = this->kills;

+   bool orig_killed_all = this->killed_all;

+

+   /* FINISHME: For now, the initial acp for loops is totally empty.

+    * We could go through once, then go through again with the acp

+    * cloned minus the killed entries after the first run through.

+    */

+   this->acp = new(mem_ctx) exec_list;

+   this->kills = new(mem_ctx) exec_list;

+   this->killed_all = false;

+

+   visit_list_elements(this, &ir->body_instructions);

+

+   if (this->killed_all) {

+      orig_acp->make_empty();

+   }

+

+   exec_list *new_kills = this->kills;

+   this->kills = orig_kills;

+   this->acp = orig_acp;

+   this->killed_all = this->killed_all || orig_killed_all;

+

+   foreach_list_safe(node, new_kills) {

+      kill_entry *k = (kill_entry *)node;

+      kill(k);

+   }

+

+   /* already descended into the children. */

+   return visit_continue_with_parent;

+}

+

+/* Remove any entries currently in the ACP for this kill. */

+void

+ir_copy_propagation_elements_visitor::kill(kill_entry *k)

+{

+   foreach_list_safe(node, acp) {

+      acp_entry *entry = (acp_entry *)node;

+

+      if (entry->lhs == k->var) {

+	 entry->write_mask = entry->write_mask & ~k->write_mask;

+	 if (entry->write_mask == 0) {

+	    entry->remove();

+	    continue;

+	 }

+      }

+      if (entry->rhs == k->var) {

+	 entry->remove();

+      }

+   }

+

+   /* If we were on a list, remove ourselves before inserting */

+   if (k->next)

+      k->remove();

+

+   this->kills->push_tail(k);

+}

+

+/**

+ * Adds directly-copied channels between vector variables to the available

+ * copy propagation list.

+ */

+void

+ir_copy_propagation_elements_visitor::add_copy(ir_assignment *ir)

+{

+   acp_entry *entry;

+   int orig_swizzle[4] = {0, 1, 2, 3};

+   int swizzle[4];

+

+   if (ir->condition)

+      return;

+

+   ir_dereference_variable *lhs = ir->lhs->as_dereference_variable();

+   if (!lhs || !(lhs->type->is_scalar() || lhs->type->is_vector()))

+      return;

+

+   ir_dereference_variable *rhs = ir->rhs->as_dereference_variable();

+   if (!rhs) {

+      ir_swizzle *swiz = ir->rhs->as_swizzle();

+      if (!swiz)

+	 return;

+

+      rhs = swiz->val->as_dereference_variable();

+      if (!rhs)

+	 return;

+

+      orig_swizzle[0] = swiz->mask.x;

+      orig_swizzle[1] = swiz->mask.y;

+      orig_swizzle[2] = swiz->mask.z;

+      orig_swizzle[3] = swiz->mask.w;

+   }

+

+   /* Move the swizzle channels out to the positions they match in the

+    * destination.  We don't want to have to rewrite the swizzle[]

+    * array every time we clear a bit of the write_mask.

+    */

+   int j = 0;

+   for (int i = 0; i < 4; i++) {

+      if (ir->write_mask & (1 << i))

+	 swizzle[i] = orig_swizzle[j++];

+   }

+

+   entry = new(this->mem_ctx) acp_entry(lhs->var, rhs->var, ir->write_mask,

+					swizzle);

+   this->acp->push_tail(entry);

+}

+

+bool

+do_copy_propagation_elements(exec_list *instructions)

+{

+   ir_copy_propagation_elements_visitor v;

+

+   visit_list_elements(&v, instructions);

+

+   return v.progress;

+}