1 /*
2 * Copyright © 2013 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 #include "ir.h"
24 #include "ir_builder.h"
25 #include "ir_rvalue_visitor.h"
26 #include "ir_optimization.h"
27
28 using namespace ir_builder;
29
30 namespace {
31
32 class vector_deref_visitor : public ir_rvalue_enter_visitor {
33 public:
vector_deref_visitor()34 vector_deref_visitor()
35 : progress(false)
36 {
37 }
38
~vector_deref_visitor()39 virtual ~vector_deref_visitor()
40 {
41 }
42
43 virtual void handle_rvalue(ir_rvalue **rv);
44 virtual ir_visitor_status visit_enter(ir_assignment *ir);
45
46 bool progress;
47 };
48
49 } /* anonymous namespace */
50
51 ir_visitor_status
visit_enter(ir_assignment * ir)52 vector_deref_visitor::visit_enter(ir_assignment *ir)
53 {
54 if (!ir->lhs || ir->lhs->ir_type != ir_type_dereference_array)
55 return ir_rvalue_enter_visitor::visit_enter(ir);
56
57 ir_dereference_array *const deref = (ir_dereference_array *) ir->lhs;
58 if (!deref->array->type->is_vector())
59 return ir_rvalue_enter_visitor::visit_enter(ir);
60
61 ir_dereference *const new_lhs = (ir_dereference *) deref->array;
62 ir->set_lhs(new_lhs);
63
64 void *mem_ctx = ralloc_parent(ir);
65 ir_constant *old_index_constant =
66 deref->array_index->constant_expression_value(mem_ctx);
67 if (!old_index_constant) {
68 ir->rhs = new(mem_ctx) ir_expression(ir_triop_vector_insert,
69 new_lhs->type,
70 new_lhs->clone(mem_ctx, NULL),
71 ir->rhs,
72 deref->array_index);
73 ir->write_mask = (1 << new_lhs->type->vector_elements) - 1;
74 } else {
75 ir->write_mask = 1 << old_index_constant->get_int_component(0);
76 }
77
78 return ir_rvalue_enter_visitor::visit_enter(ir);
79 }
80
81 void
handle_rvalue(ir_rvalue ** rv)82 vector_deref_visitor::handle_rvalue(ir_rvalue **rv)
83 {
84 if (*rv == NULL || (*rv)->ir_type != ir_type_dereference_array)
85 return;
86
87 ir_dereference_array *const deref = (ir_dereference_array *) *rv;
88 if (!deref->array->type->is_vector())
89 return;
90
91 void *mem_ctx = ralloc_parent(deref);
92 *rv = new(mem_ctx) ir_expression(ir_binop_vector_extract,
93 deref->array,
94 deref->array_index);
95 }
96
97 bool
lower_vector_derefs(gl_linked_shader * shader)98 lower_vector_derefs(gl_linked_shader *shader)
99 {
100 vector_deref_visitor v;
101
102 visit_list_elements(&v, shader->ir);
103
104 return v.progress;
105 }
106