From 6cbc64c3cb416fadad6e80042e24cd1e1b682897 Mon Sep 17 00:00:00 2001 From: Matt Turner Date: Fri, 28 Feb 2014 13:33:19 -0800 Subject: [PATCH] glsl: Optimize pow(x, 2) into x * x. Cuts two instructions out of SynMark's Gl32VSInstancing benchmark. Reviewed-by: Eric Anholt --- src/glsl/opt_algebraic.cpp | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/src/glsl/opt_algebraic.cpp b/src/glsl/opt_algebraic.cpp index 5c49a785ccd..8494bd9ec53 100644 --- a/src/glsl/opt_algebraic.cpp +++ b/src/glsl/opt_algebraic.cpp @@ -528,6 +528,14 @@ ir_algebraic_visitor::handle_expression(ir_expression *ir) if (is_vec_two(op_const[0])) return expr(ir_unop_exp2, ir->operands[1]); + if (is_vec_two(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])); + return mul(x, x); + } + break; case ir_unop_rcp: -- 2.30.2