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