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
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
|
/*
* Copyright © 2014 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.
*
* Authors:
* Connor Abbott (cwabbott0@gmail.com)
*
*/
#include "nir.h"
#include "nir_builder.h"
static bool
convert_block(nir_block *block, nir_builder *b)
{
bool progress = false;
nir_foreach_instr_safe(instr, block) {
if (instr->type != nir_instr_type_intrinsic)
continue;
nir_intrinsic_instr *load_var = nir_instr_as_intrinsic(instr);
if (load_var->intrinsic != nir_intrinsic_load_var)
continue;
nir_variable *var = load_var->variables[0]->var;
if (var->data.mode != nir_var_system_value)
continue;
b->cursor = nir_after_instr(&load_var->instr);
nir_ssa_def *sysval = NULL;
switch (var->data.location) {
case SYSTEM_VALUE_GLOBAL_INVOCATION_ID: {
/* From the GLSL man page for gl_GlobalInvocationID:
*
* "The value of gl_GlobalInvocationID is equal to
* gl_WorkGroupID * gl_WorkGroupSize + gl_LocalInvocationID"
*/
nir_const_value local_size;
memset(&local_size, 0, sizeof(local_size));
local_size.u32[0] = b->shader->info.cs.local_size[0];
local_size.u32[1] = b->shader->info.cs.local_size[1];
local_size.u32[2] = b->shader->info.cs.local_size[2];
nir_ssa_def *group_id = nir_load_work_group_id(b);
nir_ssa_def *local_id = nir_load_local_invocation_id(b);
sysval = nir_iadd(b, nir_imul(b, group_id,
nir_build_imm(b, 3, 32, local_size)),
local_id);
break;
}
case SYSTEM_VALUE_LOCAL_INVOCATION_INDEX: {
/* If lower_cs_local_index_from_id is true, then we derive the local
* index from the local id.
*/
if (!b->shader->options->lower_cs_local_index_from_id)
break;
/* From the GLSL man page for gl_LocalInvocationIndex:
*
* "The value of gl_LocalInvocationIndex is equal to
* gl_LocalInvocationID.z * gl_WorkGroupSize.x *
* gl_WorkGroupSize.y + gl_LocalInvocationID.y *
* gl_WorkGroupSize.x + gl_LocalInvocationID.x"
*/
nir_ssa_def *local_id = nir_load_local_invocation_id(b);
nir_ssa_def *size_x =
nir_imm_int(b, b->shader->info.cs.local_size[0]);
nir_ssa_def *size_y =
nir_imm_int(b, b->shader->info.cs.local_size[1]);
sysval = nir_imul(b, nir_channel(b, local_id, 2),
nir_imul(b, size_x, size_y));
sysval = nir_iadd(b, sysval,
nir_imul(b, nir_channel(b, local_id, 1), size_x));
sysval = nir_iadd(b, sysval, nir_channel(b, local_id, 0));
break;
}
case SYSTEM_VALUE_VERTEX_ID:
if (b->shader->options->vertex_id_zero_based) {
sysval = nir_iadd(b,
nir_load_vertex_id_zero_base(b),
nir_load_base_vertex(b));
} else {
sysval = nir_load_vertex_id(b);
}
break;
case SYSTEM_VALUE_INSTANCE_INDEX:
sysval = nir_iadd(b,
nir_load_instance_id(b),
nir_load_base_instance(b));
break;
case SYSTEM_VALUE_SUBGROUP_EQ_MASK:
case SYSTEM_VALUE_SUBGROUP_GE_MASK:
case SYSTEM_VALUE_SUBGROUP_GT_MASK:
case SYSTEM_VALUE_SUBGROUP_LE_MASK:
case SYSTEM_VALUE_SUBGROUP_LT_MASK: {
nir_intrinsic_op op =
nir_intrinsic_from_system_value(var->data.location);
nir_intrinsic_instr *load = nir_intrinsic_instr_create(b->shader, op);
nir_ssa_dest_init_for_type(&load->instr, &load->dest,
var->type, NULL);
load->num_components = load->dest.ssa.num_components;
nir_builder_instr_insert(b, &load->instr);
sysval = &load->dest.ssa;
break;
}
case SYSTEM_VALUE_DEVICE_INDEX:
if (b->shader->options->lower_device_index_to_zero)
sysval = nir_imm_int(b, 0);
break;
default:
break;
}
if (sysval == NULL) {
nir_intrinsic_op sysval_op =
nir_intrinsic_from_system_value(var->data.location);
sysval = nir_load_system_value(b, sysval_op, 0);
}
nir_ssa_def_rewrite_uses(&load_var->dest.ssa, nir_src_for_ssa(sysval));
nir_instr_remove(&load_var->instr);
progress = true;
}
return progress;
}
static bool
convert_impl(nir_function_impl *impl)
{
bool progress = false;
nir_builder builder;
nir_builder_init(&builder, impl);
nir_foreach_block(block, impl) {
progress |= convert_block(block, &builder);
}
nir_metadata_preserve(impl, nir_metadata_block_index |
nir_metadata_dominance);
return progress;
}
bool
nir_lower_system_values(nir_shader *shader)
{
bool progress = false;
nir_foreach_function(function, shader) {
if (function->impl)
progress = convert_impl(function->impl) || progress;
}
exec_list_make_empty(&shader->system_values);
return progress;
}
|
