Add support for inlining calls done inside of expressions.

1 files changed, 216 insertions, 0 deletions

diff --git a/ir_expression_flattening.cpp b/ir_expression_flattening.cpp
new file mode 100644
index 0000000000..5072940d62
--- /dev/null
+++ b/ir_expression_flattening.cpp
@@ -0,0 +1,216 @@
+/*
+ * 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 ir_expression_flattening.cpp
+ *
+ * Takes the leaves of expression trees and makes them dereferences of
+ * assignments of the leaves to temporaries, according to a predicate.
+ *
+ * This is used for automatic function inlining, where we want to take
+ * an expression containing a call and move the call out to its own
+ * assignment so that we can inline it at the appropriate place in the
+ * instruction stream.
+ */
+
+#define NULL 0
+#include "ir.h"
+#include "ir_visitor.h"
+#include "ir_expression_flattening.h"
+#include "glsl_types.h"
+
+class ir_expression_flattening_visitor : public ir_visitor {
+public:
+   ir_expression_flattening_visitor(ir_instruction *base_ir,
+				    bool (*predicate)(ir_instruction *ir))
+   {
+      this->base_ir = base_ir;
+      this->predicate = predicate;
+
+      /* empty */
+   }
+
+   virtual ~ir_expression_flattening_visitor()
+   {
+      /* empty */
+   }
+
+   /**
+    * \name Visit methods
+    *
+    * As typical for the visitor pattern, there must be one \c visit method for
+    * each concrete subclass of \c ir_instruction.  Virtual base classes within
+    * the hierarchy should not have \c visit methods.
+    */
+   /*@{*/
+   virtual void visit(ir_variable *);
+   virtual void visit(ir_label *);
+   virtual void visit(ir_loop *);
+   virtual void visit(ir_loop_jump *);
+   virtual void visit(ir_function_signature *);
+   virtual void visit(ir_function *);
+   virtual void visit(ir_expression *);
+   virtual void visit(ir_swizzle *);
+   virtual void visit(ir_dereference *);
+   virtual void visit(ir_assignment *);
+   virtual void visit(ir_constant *);
+   virtual void visit(ir_call *);
+   virtual void visit(ir_return *);
+   virtual void visit(ir_if *);
+   /*@}*/
+
+   bool (*predicate)(ir_instruction *ir);
+   ir_instruction *base_ir;
+};
+
+void
+do_expression_flattening(exec_list *instructions,
+			 bool (*predicate)(ir_instruction *ir))
+{
+   foreach_iter(exec_list_iterator, iter, *instructions) {
+      ir_instruction *ir = (ir_instruction *)iter.get();
+
+      ir_expression_flattening_visitor v(ir, predicate);
+      ir->accept(&v);
+   }
+}
+
+void
+ir_expression_flattening_visitor::visit(ir_variable *ir)
+{
+   (void) ir;
+}
+
+
+void
+ir_expression_flattening_visitor::visit(ir_label *ir)
+{
+   ir->signature->accept(this);
+}
+
+void
+ir_expression_flattening_visitor::visit(ir_loop *ir)
+{
+   do_expression_flattening(&ir->body_instructions, this->predicate);
+}
+
+void
+ir_expression_flattening_visitor::visit(ir_loop_jump *ir)
+{
+   (void) ir;
+}
+
+
+void
+ir_expression_flattening_visitor::visit(ir_function_signature *ir)
+{
+   do_expression_flattening(&ir->body, this->predicate);
+}
+
+void
+ir_expression_flattening_visitor::visit(ir_function *ir)
+{
+   (void) ir;
+}
+
+void
+ir_expression_flattening_visitor::visit(ir_expression *ir)
+{
+   unsigned int operand;
+
+   for (operand = 0; operand < ir->get_num_operands(); operand++) {
+      ir->operands[operand]->accept(this);
+
+      /* If the operand matches the predicate, then we'll assign its
+       * value to a temporary and deref the temporary as the operand.
+       */
+      if (this->predicate(ir->operands[operand])) {
+	 ir_variable *var;
+	 ir_assignment *assign;
+
+	 var = new ir_variable(ir->operands[operand]->type, "flattening_tmp");
+	 this->base_ir->insert_before(var);
+
+	 assign = new ir_assignment(new ir_dereference(var),
+				    ir->operands[operand],
+				    NULL);
+	 this->base_ir->insert_before(assign);
+
+	 ir->operands[operand] = new ir_dereference(var);
+      }
+   }
+}
+
+
+void
+ir_expression_flattening_visitor::visit(ir_swizzle *ir)
+{
+   ir->val->accept(this);
+}
+
+
+void
+ir_expression_flattening_visitor::visit(ir_dereference *ir)
+{
+   if (ir->mode == ir_dereference::ir_reference_array) {
+      ir->selector.array_index->accept(this);
+   }
+   ir->var->accept(this);
+}
+
+void
+ir_expression_flattening_visitor::visit(ir_assignment *ir)
+{
+   ir->rhs->accept(this);
+}
+
+
+void
+ir_expression_flattening_visitor::visit(ir_constant *ir)
+{
+   (void) ir;
+}
+
+
+void
+ir_expression_flattening_visitor::visit(ir_call *ir)
+{
+   (void) ir;
+}
+
+
+void
+ir_expression_flattening_visitor::visit(ir_return *ir)
+{
+   (void) ir;
+}
+
+
+void
+ir_expression_flattening_visitor::visit(ir_if *ir)
+{
+   ir->condition->accept(this);
+
+   do_expression_flattening(&ir->then_instructions, this->predicate);
+   do_expression_flattening(&ir->else_instructions, this->predicate);
+}