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/*
* Copyright © 2016 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#ifndef OPT_ADD_NEG_TO_SUB_H
#define OPT_ADD_NEG_TO_SUB_H
#include "ir.h"
#include "ir_hierarchical_visitor.h"
class add_neg_to_sub_visitor : public ir_hierarchical_visitor {
public:
add_neg_to_sub_visitor()
{
/* empty */
}
ir_visitor_status visit_leave(ir_expression *ir)
{
if (ir->operation != ir_binop_add)
return visit_continue;
for (unsigned i = 0; i < 2; i++) {
ir_expression *const op = ir->operands[i]->as_expression();
if (op != NULL && op->operation == ir_unop_neg) {
ir->operation = ir_binop_sub;
/* This ensures that -a + b becomes b - a. */
if (i == 0)
ir->operands[0] = ir->operands[1];
ir->operands[1] = op->operands[0];
break;
}
}
return visit_continue;
}
};
#endif /* OPT_ADD_NEG_TO_SUB_H */
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