From d72956790fed5f62b8eea5938ed432544530f7bd Mon Sep 17 00:00:00 2001 From: Eric Anholt Date: Sat, 18 Jan 2014 10:57:29 -0800 Subject: [PATCH] glsl: Optimize pow(x, 1) -> x. total instructions in shared programs: 1627826 -> 1627754 (-0.00%) instructions in affected programs: 6640 -> 6568 (-1.08%) GAINED: 0 LOST: 0 (HoN and savage2) Reviewed-by: Matt Turner --- src/glsl/opt_algebraic.cpp | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/src/glsl/opt_algebraic.cpp b/src/glsl/opt_algebraic.cpp index 1e715817f76..953b03c2943 100644 --- a/src/glsl/opt_algebraic.cpp +++ b/src/glsl/opt_algebraic.cpp @@ -520,6 +520,10 @@ ir_algebraic_visitor::handle_expression(ir_expression *ir) if (is_vec_one(op_const[0])) return op_const[0]; + /* x^1 == x */ + if (is_vec_one(op_const[1])) + return ir->operands[0]; + /* pow(2,x) == exp2(x) */ if (is_vec_two(op_const[0])) return expr(ir_unop_exp2, ir->operands[1]); -- 2.30.2