1 /*
2 * Copyright © 2010 Intel Corporation
3 *
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:
10 *
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
13 * Software.
14 *
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.
22 */
23
24 /**
25 * \file ir_expression_flattening.cpp
26 *
27 * Takes the leaves of expression trees and makes them dereferences of
28 * assignments of the leaves to temporaries, according to a predicate.
29 *
30 * This is used for breaking down matrix operations, where it's easier to
31 * create a temporary and work on each of its vector components individually.
32 */
33
34 #include "ir.h"
35 #include "ir_rvalue_visitor.h"
36 #include "ir_expression_flattening.h"
37
38 class ir_expression_flattening_visitor : public ir_rvalue_visitor {
39 public:
ir_expression_flattening_visitor(bool (* predicate)(ir_instruction * ir))40 ir_expression_flattening_visitor(bool (*predicate)(ir_instruction *ir))
41 {
42 this->predicate = predicate;
43 }
44
~ir_expression_flattening_visitor()45 virtual ~ir_expression_flattening_visitor()
46 {
47 /* empty */
48 }
49
50 void handle_rvalue(ir_rvalue **rvalue);
51 bool (*predicate)(ir_instruction *ir);
52 };
53
54 void
do_expression_flattening(exec_list * instructions,bool (* predicate)(ir_instruction * ir))55 do_expression_flattening(exec_list *instructions,
56 bool (*predicate)(ir_instruction *ir))
57 {
58 ir_expression_flattening_visitor v(predicate);
59
60 foreach_in_list(ir_instruction, ir, instructions) {
61 ir->accept(&v);
62 }
63 }
64
65 void
handle_rvalue(ir_rvalue ** rvalue)66 ir_expression_flattening_visitor::handle_rvalue(ir_rvalue **rvalue)
67 {
68 ir_variable *var;
69 ir_assignment *assign;
70 ir_rvalue *ir = *rvalue;
71
72 if (!ir || !this->predicate(ir))
73 return;
74
75 void *ctx = ralloc_parent(ir);
76
77 var = new(ctx) ir_variable(ir->type, "flattening_tmp", ir_var_temporary);
78 base_ir->insert_before(var);
79
80 assign = new(ctx) ir_assignment(new(ctx) ir_dereference_variable(var),
81 ir,
82 NULL);
83 base_ir->insert_before(assign);
84
85 *rvalue = new(ctx) ir_dereference_variable(var);
86 }
87