From d7bef19c7ff40f0b83a42fdb8509eed3ad1e40a3 Mon Sep 17 00:00:00 2001 From: Matt Turner Date: Mon, 4 Jun 2012 16:17:12 -0400 Subject: [PATCH] glsl: Check for zero vectors in ir_binop_dot Reviewed-by: Kenneth Graunke --- src/glsl/opt_algebraic.cpp | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/src/glsl/opt_algebraic.cpp b/src/glsl/opt_algebraic.cpp index d397612..5a9881d 100644 --- a/src/glsl/opt_algebraic.cpp +++ b/src/glsl/opt_algebraic.cpp @@ -309,6 +309,13 @@ ir_algebraic_visitor::handle_expression(ir_expression *ir) } break; + case ir_binop_dot: + if (is_vec_zero(op_const[0]) || is_vec_zero(op_const[1])) { + this->progress = true; + return ir_constant::zero(mem_ctx, ir->type); + } + break; + case ir_binop_logic_and: /* FINISHME: Also simplify (a && a) to (a). */ if (is_vec_one(op_const[0])) { -- 2.7.4