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-rw-r--r--mesalib/src/glsl/opt_algebraic.cpp17
1 files changed, 17 insertions, 0 deletions
diff --git a/mesalib/src/glsl/opt_algebraic.cpp b/mesalib/src/glsl/opt_algebraic.cpp
index 05a589989..332f0b77b 100644
--- a/mesalib/src/glsl/opt_algebraic.cpp
+++ b/mesalib/src/glsl/opt_algebraic.cpp
@@ -88,6 +88,12 @@ is_vec_one(ir_constant *ir)
}
static inline bool
+is_vec_two(ir_constant *ir)
+{
+ return (ir == NULL) ? false : ir->is_value(2.0, 2);
+}
+
+static inline bool
is_vec_negative_one(ir_constant *ir)
{
return (ir == NULL) ? false : ir->is_negative_one();
@@ -416,6 +422,17 @@ ir_algebraic_visitor::handle_expression(ir_expression *ir)
}
break;
+ case ir_binop_pow:
+ /* 1^x == 1 */
+ if (is_vec_one(op_const[0]))
+ return op_const[0];
+
+ /* pow(2,x) == exp2(x) */
+ if (is_vec_two(op_const[0]))
+ return expr(ir_unop_exp2, ir->operands[1]);
+
+ break;
+
case ir_unop_rcp:
if (op_expr[0] && op_expr[0]->operation == ir_unop_rcp)
return op_expr[0]->operands[0];