From d5fa8a956211692441b9c3ffc97b7486599ab3a3 Mon Sep 17 00:00:00 2001 From: Matt Turner Date: Mon, 24 Feb 2014 15:00:45 -0800 Subject: [PATCH] glsl: Optimize lrp(x, 0, a) into x - (x * a). Helps one program in shader-db: instructions in affected programs: 96 -> 92 (-4.17%) Reviewed-by: Ian Romanick --- src/glsl/opt_algebraic.cpp | 2 ++ 1 file changed, 2 insertions(+) diff --git a/src/glsl/opt_algebraic.cpp b/src/glsl/opt_algebraic.cpp index 28f95a44c7f..778638cf261 100644 --- a/src/glsl/opt_algebraic.cpp +++ b/src/glsl/opt_algebraic.cpp @@ -570,6 +570,8 @@ ir_algebraic_visitor::handle_expression(ir_expression *ir) return ir->operands[0]; } else if (is_vec_zero(op_const[0])) { return mul(ir->operands[1], ir->operands[2]); + } else if (is_vec_zero(op_const[1])) { + return add(ir->operands[0], neg(mul(ir->operands[0], ir->operands[2]))); } break; -- 2.30.2