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_visitor.h"
36 #include "ir_rvalue_visitor.h"
37 #include "ir_expression_flattening.h"
38 #include "glsl_types.h"
39
40 class ir_expression_flattening_visitor : public ir_rvalue_visitor {
41 public:
ir_expression_flattening_visitor(bool (* predicate)(ir_instruction * ir))42 ir_expression_flattening_visitor(bool (*predicate)(ir_instruction *ir))
43 {
44 this->predicate = predicate;
45 }
46
~ir_expression_flattening_visitor()47 virtual ~ir_expression_flattening_visitor()
48 {
49 /* empty */
50 }
51
52 void handle_rvalue(ir_rvalue **rvalue);
53 bool (*predicate)(ir_instruction *ir);
54 };
55
56 void
do_expression_flattening(exec_list * instructions,bool (* predicate)(ir_instruction * ir))57 do_expression_flattening(exec_list *instructions,
58 bool (*predicate)(ir_instruction *ir))
59 {
60 ir_expression_flattening_visitor v(predicate);
61
62 foreach_iter(exec_list_iterator, iter, *instructions) {
63 ir_instruction *ir = (ir_instruction *)iter.get();
64
65 ir->accept(&v);
66 }
67 }
68
69 void
handle_rvalue(ir_rvalue ** rvalue)70 ir_expression_flattening_visitor::handle_rvalue(ir_rvalue **rvalue)
71 {
72 ir_variable *var;
73 ir_assignment *assign;
74 ir_rvalue *ir = *rvalue;
75
76 if (!ir || !this->predicate(ir))
77 return;
78
79 void *ctx = ralloc_parent(ir);
80
81 var = new(ctx) ir_variable(ir->type, "flattening_tmp", ir_var_temporary);
82 base_ir->insert_before(var);
83
84 assign = new(ctx) ir_assignment(new(ctx) ir_dereference_variable(var),
85 ir,
86 NULL);
87 base_ir->insert_before(assign);
88
89 *rvalue = new(ctx) ir_dereference_variable(var);
90 }
91