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diff --git a/src/gallium/drivers/r600/sb/sb_expr.h b/src/gallium/drivers/r600/sb/sb_expr.h
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+++ b/src/gallium/drivers/r600/sb/sb_expr.h
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+/*
+ * Copyright 2013 Vadim Girlin <[email protected]>
+ *
+ * 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
+ * on the rights to use, copy, modify, merge, publish, distribute, sub
+ * license, 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 NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHOR(S) AND/OR THEIR SUPPLIERS 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.
+ *
+ * Authors:
+ *      Vadim Girlin
+ */
+
+#ifndef SB_EXPR_H_
+#define SB_EXPR_H_
+
+namespace r600_sb {
+
+inline float float_clamp(float v) {
+	return v < 0.0f ? 0.0f : (v > 1.0f ? 1.0f : v);
+}
+
+value* get_select_value_for_em(shader &sh, value *em);
+
+void convert_predset_to_set(shader &sh, alu_node *a);
+unsigned invert_setcc_condition(unsigned cc, bool &swap_args);
+unsigned get_setcc_opcode(unsigned cc, unsigned cmp_type, bool int_dst);
+unsigned get_predsetcc_opcode(unsigned cc, unsigned cmp_type);
+
+class expr_handler {
+
+   shader &sh;
+   value_table &vt;
+
+public:
+
+   expr_handler(shader &sh);
+
+   bool equal(value *l, value *r);
+   bool defs_equal(value *l, value *r);
+   bool args_equal(const vvec &l, const vvec &r);
+   bool ops_equal(const alu_node *l, const alu_node *r);
+   bool ivars_equal(value *l, value *r);
+
+   value* get_const(const literal &l);
+
+   bool try_fold(value *v);
+   bool try_fold(node *n);
+
+   bool fold(node &n);
+   bool fold(container_node &n);
+   bool fold(alu_node &n);
+   bool fold(fetch_node &n);
+   bool fold(cf_node &n);
+
+   bool fold_setcc(alu_node &n);
+
+   bool fold_alu_op1(alu_node &n);
+   bool fold_alu_op2(alu_node &n);
+   bool fold_alu_op3(alu_node &n);
+
+   void apply_alu_src_mod(const bc_alu &bc, unsigned src, literal &v);
+   void apply_alu_dst_mod(const bc_alu &bc, literal &v);
+
+   void assign_source(value *dst, value *src);
+};
+
+} // namespace r600_sb
+
+#endif /* SB_EXPR_H_ */