[Mesa-dev] [PATCH 4/9] glsl: Optimize ir_triop_lrp(x, y, a) with a = 0.0f or 1.0f

[Matt Turner]

---
 src/glsl/opt_algebraic.cpp |   16 +++++++++++++---
 1 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/src/glsl/opt_algebraic.cpp b/src/glsl/opt_algebraic.cpp
index 75948db..952941e 100644
--- a/src/glsl/opt_algebraic.cpp
+++ b/src/glsl/opt_algebraic.cpp
@@ -186,12 +186,12 @@ ir_algebraic_visitor::swizzle_if_required(ir_expression *expr,
 ir_rvalue *
 ir_algebraic_visitor::handle_expression(ir_expression *ir)
 {
-   ir_constant *op_const[2] = {NULL, NULL};
-   ir_expression *op_expr[2] = {NULL, NULL};
+   ir_constant *op_const[3] = {NULL, NULL, NULL};
+   ir_expression *op_expr[3] = {NULL, NULL, NULL};
    ir_expression *temp;
    unsigned int i;
 
-   assert(ir->get_num_operands() <= 2);
+   assert(ir->get_num_operands() <= 3);
    for (i = 0; i < ir->get_num_operands(); i++) {
       if (ir->operands[i]->type->is_matrix())
 	 return ir;
@@ -415,6 +415,16 @@ ir_algebraic_visitor::handle_expression(ir_expression *ir)
 
       break;
 
+   case ir_triop_lrp:
+     if (is_vec_zero(op_const[2])) {
+        this->progress = true;
+        return swizzle_if_required(ir, ir->operands[0]);
+     } else if (is_vec_one(op_const[2])) {
+        this->progress = true;
+        return swizzle_if_required(ir, ir->operands[1]);
+     }
+     break;
+
    default:
       break;
    }
-- 
1.7.8.6