1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
|
/*
* Copyright © 2010 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.
*/
/**
* \file ir_vec_index_to_swizzle.cpp
*
* Turns constant indexing into vector types to swizzles. This will
* let other swizzle-aware optimization passes catch these constructs,
* and codegen backends not have to worry about this case.
*/
#include "ir.h"
#include "ir_visitor.h"
#include "ir_optimization.h"
#include "glsl_types.h"
/**
* Visitor class for replacing expressions with ir_constant values.
*/
class ir_vec_index_to_swizzle_visitor : public ir_hierarchical_visitor {
public:
ir_vec_index_to_swizzle_visitor()
{
progress = false;
}
ir_rvalue *convert_vec_index_to_swizzle(ir_rvalue *val);
virtual ir_visitor_status visit_enter(ir_expression *);
virtual ir_visitor_status visit_enter(ir_swizzle *);
virtual ir_visitor_status visit_enter(ir_assignment *);
virtual ir_visitor_status visit_enter(ir_return *);
virtual ir_visitor_status visit_enter(ir_call *);
virtual ir_visitor_status visit_enter(ir_if *);
bool progress;
};
ir_rvalue *
ir_vec_index_to_swizzle_visitor::convert_vec_index_to_swizzle(ir_rvalue *ir)
{
ir_dereference_array *deref = ir->as_dereference_array();
ir_constant *ir_constant;
if (!deref)
return ir;
if (deref->array->type->is_matrix() || deref->array->type->is_array())
return ir;
assert(deref->array_index->type->base_type == GLSL_TYPE_INT);
ir_constant = deref->array_index->constant_expression_value();
if (!ir_constant)
return ir;
this->progress = true;
return new ir_swizzle(deref->array, ir_constant->value.i[0], 0, 0, 0, 1);
}
ir_visitor_status
ir_vec_index_to_swizzle_visitor::visit_enter(ir_expression *ir)
{
unsigned int i;
for (i = 0; i < ir->get_num_operands(); i++) {
ir->operands[i] = convert_vec_index_to_swizzle(ir->operands[i]);
}
return visit_continue;
}
ir_visitor_status
ir_vec_index_to_swizzle_visitor::visit_enter(ir_swizzle *ir)
{
/* Can't be hit from normal GLSL, since you can't swizzle a scalar (which
* the result of indexing a vector is. But maybe at some point we'll end up
* using swizzling of scalars for vector construction.
*/
ir->val = convert_vec_index_to_swizzle(ir->val);
return visit_continue;
}
ir_visitor_status
ir_vec_index_to_swizzle_visitor::visit_enter(ir_assignment *ir)
{
ir->lhs = convert_vec_index_to_swizzle(ir->lhs);
ir->rhs = convert_vec_index_to_swizzle(ir->rhs);
return visit_continue;
}
ir_visitor_status
ir_vec_index_to_swizzle_visitor::visit_enter(ir_call *ir)
{
foreach_iter(exec_list_iterator, iter, *ir) {
ir_rvalue *param = (ir_rvalue *)iter.get();
ir_rvalue *new_param = convert_vec_index_to_swizzle(param);
if (new_param != param) {
param->insert_before(new_param);
param->remove();
}
}
return visit_continue;
}
ir_visitor_status
ir_vec_index_to_swizzle_visitor::visit_enter(ir_return *ir)
{
if (ir->value) {
ir->value = convert_vec_index_to_swizzle(ir->value);
}
return visit_continue;
}
ir_visitor_status
ir_vec_index_to_swizzle_visitor::visit_enter(ir_if *ir)
{
ir->condition = convert_vec_index_to_swizzle(ir->condition);
return visit_continue;
}
bool
do_vec_index_to_swizzle(exec_list *instructions)
{
ir_vec_index_to_swizzle_visitor v;
v.run(instructions);
return false;
}
|
