From 9b577d57029bb643f2b48b80648b4f901818e93b Mon Sep 17 00:00:00 2001 From: Matt Turner Date: Mon, 16 Mar 2015 21:33:31 -0700 Subject: glsl: Transform pow(x, 4) into (x*x)*(x*x). Reviewed-by: Juha-Pekka Heikkila Reviewed-by: Kenneth Graunke --- src/glsl/opt_algebraic.cpp | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/src/glsl/opt_algebraic.cpp b/src/glsl/opt_algebraic.cpp index 3d2f2ca0ba..fa5db70f2d 100644 --- a/src/glsl/opt_algebraic.cpp +++ b/src/glsl/opt_algebraic.cpp @@ -98,6 +98,12 @@ is_vec_two(ir_constant *ir) return (ir == NULL) ? false : ir->is_value(2.0, 2); } +static inline bool +is_vec_four(ir_constant *ir) +{ + return (ir == NULL) ? false : ir->is_value(4.0, 4); +} + static inline bool is_vec_negative_one(ir_constant *ir) { @@ -774,6 +780,20 @@ ir_algebraic_visitor::handle_expression(ir_expression *ir) return mul(x, x); } + if (is_vec_four(op_const[1])) { + ir_variable *x = new(ir) ir_variable(ir->operands[1]->type, "x", + ir_var_temporary); + base_ir->insert_before(x); + base_ir->insert_before(assign(x, ir->operands[0])); + + ir_variable *squared = new(ir) ir_variable(ir->operands[1]->type, + "squared", + ir_var_temporary); + base_ir->insert_before(squared); + base_ir->insert_before(assign(squared, mul(x, x))); + return mul(squared, squared); + } + break; case ir_binop_min: -- cgit v1.2.3