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glsl: Recognize sat(add(b2f(a), b2f(b))) as a logical OR.

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Transform this into b2f(or(a, b)).

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
This commit is contained in:
Matt Turner 2015-03-18 10:39:38 -07:00
parent c8e8f66036
commit b481ebbe39
1 changed files with 12 additions and 0 deletions
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12
src/glsl/opt_algebraic.cpp
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@ -421,6 +421,18 @@ ir_algebraic_visitor::handle_expression(ir_expression *ir)
break;
}
case ir_unop_saturate:
if (op_expr[0] && op_expr[0]->operation == ir_binop_add) {
ir_expression *b2f_0 = op_expr[0]->operands[0]->as_expression();
ir_expression *b2f_1 = op_expr[0]->operands[1]->as_expression();
if (b2f_0 && b2f_0->operation == ir_unop_b2f &&
b2f_1 && b2f_1->operation == ir_unop_b2f) {
return b2f(logic_or(b2f_0->operands[0], b2f_1->operands[0]));
}
}
break;
case ir_binop_add:
if (is_vec_zero(op_const[0]))
return ir->operands[1];