From d6c1d66d3a74e25435b5ebcde208e8049b669120 Mon Sep 17 00:00:00 2001 From: Kenneth Graunke Date: Sun, 5 Jan 2014 22:19:42 -0800 Subject: [PATCH] glsl: Optimize pow(1.0, X) --> 1.0. Surprisingly, this helps one vertex shader in 3DMMES. Signed-off-by: Kenneth Graunke Reviewed-by: Matt Turner --- src/glsl/opt_algebraic.cpp | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/src/glsl/opt_algebraic.cpp b/src/glsl/opt_algebraic.cpp index 05a5899..5e885f7 100644 --- a/src/glsl/opt_algebraic.cpp +++ b/src/glsl/opt_algebraic.cpp @@ -416,6 +416,12 @@ 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]; + break; + case ir_unop_rcp: if (op_expr[0] && op_expr[0]->operation == ir_unop_rcp) return op_expr[0]->operands[0]; -- 2.7.4