2 * Copyright © 2010 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.
25 * \file ir_function_inlining.cpp
27 * Moves constant branches of if statements out to the surrounding
34 class ir_if_simplification_visitor
: public ir_hierarchical_visitor
{
36 ir_if_simplification_visitor()
38 this->made_progress
= false;
41 ir_visitor_status
visit_leave(ir_if
*);
47 do_if_simplification(exec_list
*instructions
)
49 ir_if_simplification_visitor v
;
52 return v
.made_progress
;
57 ir_if_simplification_visitor::visit_leave(ir_if
*ir
)
59 /* FINISHME: Ideally there would be a way to note that the condition results
60 * FINISHME: in a constant before processing both of the other subtrees.
61 * FINISHME: This can probably be done with some flags, but it would take
62 * FINISHME: some work to get right.
64 ir_constant
*condition_constant
= ir
->condition
->constant_expression_value();
65 if (condition_constant
) {
66 /* Move the contents of the one branch of the conditional
69 if (condition_constant
->value
.b
[0]) {
70 foreach_iter(exec_list_iterator
, then_iter
, ir
->then_instructions
) {
71 ir_instruction
*then_ir
= (ir_instruction
*)then_iter
.get();
72 ir
->insert_before(then_ir
);
75 foreach_iter(exec_list_iterator
, else_iter
, ir
->else_instructions
) {
76 ir_instruction
*else_ir
= (ir_instruction
*)else_iter
.get();
77 ir
->insert_before(else_ir
);
81 this->made_progress
= true;
84 return visit_continue
;