2 * Copyright © 2013 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 #include "ir_builder.h"
25 #include "ir_rvalue_visitor.h"
26 #include "ir_optimization.h"
28 using namespace ir_builder
;
32 class vector_insert_visitor
: public ir_rvalue_visitor
{
34 vector_insert_visitor(bool lower_nonconstant_index
)
35 : progress(false), lower_nonconstant_index(lower_nonconstant_index
),
36 remove_assignment(false)
38 factory
.instructions
= &factory_instructions
;
41 virtual ~vector_insert_visitor()
43 assert(factory_instructions
.is_empty());
46 virtual void handle_rvalue(ir_rvalue
**rv
);
47 virtual ir_visitor_status
visit_leave(ir_assignment
*expr
);
50 exec_list factory_instructions
;
52 bool lower_nonconstant_index
;
53 bool remove_assignment
;
56 } /* anonymous namespace */
59 vector_insert_visitor::handle_rvalue(ir_rvalue
**rv
)
61 if (*rv
== NULL
|| (*rv
)->ir_type
!= ir_type_expression
)
64 ir_expression
*const expr
= (ir_expression
*) *rv
;
66 if (likely(expr
->operation
!= ir_triop_vector_insert
))
69 factory
.mem_ctx
= ralloc_parent(expr
);
71 ir_constant
*const idx
=
72 expr
->operands
[2]->constant_expression_value(factory
.mem_ctx
);
74 unsigned index
= idx
->value
.u
[0];
76 if (index
>= expr
->operands
[0]->type
->vector_elements
) {
77 /* Section 5.11 (Out-of-Bounds Accesses) of the GLSL 4.60 spec says:
79 * In the subsections described above for array, vector, matrix and
80 * structure accesses, any out-of-bounds access produced undefined
81 * behavior.... Out-of-bounds writes may be discarded or overwrite
82 * other variables of the active program.
84 this->remove_assignment
= true;
85 this->progress
= true;
89 /* Replace (vector_insert (vec) (scalar) (index)) with a dereference of
90 * a new temporary. The new temporary gets assigned as
95 * where mask is the component selected by index.
97 ir_variable
*const temp
=
98 factory
.make_temp(expr
->operands
[0]->type
, "vec_tmp");
100 const int mask
= 1 << idx
->value
.i
[0];
102 factory
.emit(assign(temp
, expr
->operands
[0]));
103 factory
.emit(assign(temp
, expr
->operands
[1], mask
));
105 this->progress
= true;
106 *rv
= new(factory
.mem_ctx
) ir_dereference_variable(temp
);
107 } else if (this->lower_nonconstant_index
) {
108 /* Replace (vector_insert (vec) (scalar) (index)) with a dereference of
109 * a new temporary. The new temporary gets assigned as
121 ir_variable
*const temp
=
122 factory
.make_temp(expr
->operands
[0]->type
, "vec_tmp");
124 ir_variable
*const src_temp
=
125 factory
.make_temp(expr
->operands
[1]->type
, "src_temp");
127 factory
.emit(assign(temp
, expr
->operands
[0]));
128 factory
.emit(assign(src_temp
, expr
->operands
[1]));
130 assert(expr
->operands
[2]->type
== glsl_type::int_type
||
131 expr
->operands
[2]->type
== glsl_type::uint_type
);
133 for (unsigned i
= 0; i
< expr
->type
->vector_elements
; i
++) {
134 ir_constant
*const cmp_index
=
135 ir_constant::zero(factory
.mem_ctx
, expr
->operands
[2]->type
);
136 cmp_index
->value
.u
[0] = i
;
138 ir_variable
*const cmp_result
=
139 factory
.make_temp(glsl_type::bool_type
, "index_condition");
141 factory
.emit(assign(cmp_result
,
142 equal(expr
->operands
[2]->clone(factory
.mem_ctx
,
146 factory
.emit(if_tree(cmp_result
,
147 assign(temp
, src_temp
, WRITEMASK_X
<< i
)));
150 this->progress
= true;
151 *rv
= new(factory
.mem_ctx
) ir_dereference_variable(temp
);
154 base_ir
->insert_before(factory
.instructions
);
158 vector_insert_visitor::visit_leave(ir_assignment
*ir
)
160 ir_rvalue_visitor::visit_leave(ir
);
162 if (this->remove_assignment
) {
164 this->remove_assignment
= false;
167 return visit_continue
;
171 lower_vector_insert(exec_list
*instructions
, bool lower_nonconstant_index
)
173 vector_insert_visitor
v(lower_nonconstant_index
);
175 visit_list_elements(&v
, instructions
);