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diff --git a/mesalib/src/glsl/ir_expression_flattening.cpp b/mesalib/src/glsl/ir_expression_flattening.cpp
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+++ b/mesalib/src/glsl/ir_expression_flattening.cpp
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+/*
+ * 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.
+ */
+
+#include "ir.h"
+#include "ir_visitor.h"
+#include "ir_rvalue_visitor.h"
+#include "ir_expression_flattening.h"
+#include "glsl_types.h"
+
+class ir_expression_flattening_visitor : public ir_rvalue_visitor {
+public:
+   ir_expression_flattening_visitor(bool (*predicate)(ir_instruction *ir))
+   {
+      this->predicate = predicate;
+   }
+
+   virtual ~ir_expression_flattening_visitor()
+   {
+      /* empty */
+   }
+
+   void handle_rvalue(ir_rvalue **rvalue);
+   bool (*predicate)(ir_instruction *ir);
+};
+
+void
+do_expression_flattening(exec_list *instructions,
+			 bool (*predicate)(ir_instruction *ir))
+{
+   ir_expression_flattening_visitor v(predicate);
+
+   foreach_iter(exec_list_iterator, iter, *instructions) {
+      ir_instruction *ir = (ir_instruction *)iter.get();
+
+      ir->accept(&v);
+   }
+}
+
+void
+ir_expression_flattening_visitor::handle_rvalue(ir_rvalue **rvalue)
+{
+   ir_variable *var;
+   ir_assignment *assign;
+   ir_rvalue *ir = *rvalue;
+
+   if (!ir || !this->predicate(ir))
+      return;
+
+   void *ctx = talloc_parent(ir);
+
+   var = new(ctx) ir_variable(ir->type, "flattening_tmp", ir_var_temporary);
+   base_ir->insert_before(var);
+
+   assign = new(ctx) ir_assignment(new(ctx) ir_dereference_variable(var),
+				   ir,
+				   NULL);
+   base_ir->insert_before(assign);
+
+   *rvalue = new(ctx) ir_dereference_variable(var);
+}