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glsl: Optimize abs(-expr) and abs(abs(expr)) into abs(expr).

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Reviewed-by: Paul Berry <stereotype441@gmail.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Matt Turner 2013-10-16 16:56:44 -07:00
parent 5b3aec412e
commit 963df4d37d
1 changed files with 18 additions and 0 deletions
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18
src/glsl/opt_algebraic.cpp
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@ -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;