From 963df4d37da7a7a1ee02cf26e142386a62a611f8 Mon Sep 17 00:00:00 2001 From: Matt Turner Date: Wed, 16 Oct 2013 16:56:44 -0700 Subject: [PATCH] glsl: Optimize abs(-expr) and abs(abs(expr)) into abs(expr). Reviewed-by: Paul Berry Reviewed-by: Eric Anholt --- src/glsl/opt_algebraic.cpp | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/src/glsl/opt_algebraic.cpp b/src/glsl/opt_algebraic.cpp index b915f3c429b..9b0596cd71a 100644 --- a/src/glsl/opt_algebraic.cpp +++ b/src/glsl/opt_algebraic.cpp @@ -210,6 +210,24 @@ ir_algebraic_visitor::handle_expression(ir_expression *ir) this->mem_ctx = ralloc_parent(ir); switch (ir->operation) { + case ir_unop_abs: + if (op_expr[0] == NULL) + break; + + switch (op_expr[0]->operation) { + case ir_unop_abs: + case ir_unop_neg: + this->progress = true; + temp = new(mem_ctx) ir_expression(ir_unop_abs, + ir->type, + op_expr[0]->operands[0], + NULL); + return swizzle_if_required(ir, temp); + default: + break; + } + break; + case ir_unop_logic_not: { enum ir_expression_operation new_op = ir_unop_logic_not; -- 2.30.2