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
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
|
/*
* 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.
*/
#include "main/glheader.h"
#include "main/context.h"
#include "main/macros.h"
#include "program.h"
#include "prog_instruction.h"
#include "prog_optimize.h"
#include "prog_parameter.h"
#include <stdbool.h>
static bool
src_regs_are_constant(const struct prog_instruction *inst, unsigned num_srcs)
{
unsigned i;
for (i = 0; i < num_srcs; i++) {
if (inst->SrcReg[i].File != PROGRAM_CONSTANT)
return false;
if (inst->SrcReg[i].RelAddr)
return false;
}
return true;
}
static struct prog_src_register
src_reg_for_float(struct gl_program *prog, float val)
{
struct prog_src_register src;
unsigned swiz;
memset(&src, 0, sizeof(src));
src.File = PROGRAM_CONSTANT;
src.Index = _mesa_add_unnamed_constant(prog->Parameters,
(gl_constant_value *) &val, 1, &swiz);
src.Swizzle = swiz;
return src;
}
static struct prog_src_register
src_reg_for_vec4(struct gl_program *prog, const float *val)
{
struct prog_src_register src;
unsigned swiz;
memset(&src, 0, sizeof(src));
src.File = PROGRAM_CONSTANT;
src.Index = _mesa_add_unnamed_constant(prog->Parameters,
(gl_constant_value *) val, 4, &swiz);
src.Swizzle = swiz;
return src;
}
static bool
src_regs_are_same(const struct prog_src_register *a,
const struct prog_src_register *b)
{
return (a->File == b->File)
&& (a->Index == b->Index)
&& (a->Swizzle == b->Swizzle)
&& (a->Negate == b->Negate)
&& (a->RelAddr == 0)
&& (b->RelAddr == 0);
}
static void
get_value(struct gl_program *prog, struct prog_src_register *r, float *data)
{
const gl_constant_value *const value =
prog->Parameters->ParameterValues[r->Index];
data[0] = value[GET_SWZ(r->Swizzle, 0)].f;
data[1] = value[GET_SWZ(r->Swizzle, 1)].f;
data[2] = value[GET_SWZ(r->Swizzle, 2)].f;
data[3] = value[GET_SWZ(r->Swizzle, 3)].f;
if (r->Negate & 0x01) {
data[0] = -data[0];
}
if (r->Negate & 0x02) {
data[1] = -data[1];
}
if (r->Negate & 0x04) {
data[2] = -data[2];
}
if (r->Negate & 0x08) {
data[3] = -data[3];
}
}
/**
* Try to replace instructions that produce a constant result with simple moves
*
* The hope is that a following copy propagation pass will eliminate the
* unnecessary move instructions.
*/
GLboolean
_mesa_constant_fold(struct gl_program *prog)
{
bool progress = false;
unsigned i;
for (i = 0; i < prog->NumInstructions; i++) {
struct prog_instruction *const inst = &prog->Instructions[i];
switch (inst->Opcode) {
case OPCODE_ADD:
if (src_regs_are_constant(inst, 2)) {
float a[4];
float b[4];
float result[4];
get_value(prog, &inst->SrcReg[0], a);
get_value(prog, &inst->SrcReg[1], b);
result[0] = a[0] + b[0];
result[1] = a[1] + b[1];
result[2] = a[2] + b[2];
result[3] = a[3] + b[3];
inst->Opcode = OPCODE_MOV;
inst->SrcReg[0] = src_reg_for_vec4(prog, result);
inst->SrcReg[1].File = PROGRAM_UNDEFINED;
inst->SrcReg[1].Swizzle = SWIZZLE_NOOP;
progress = true;
}
break;
case OPCODE_CMP:
/* FINISHME: We could also optimize CMP instructions where the first
* FINISHME: source is a constant that is either all < 0.0 or all
* FINISHME: >= 0.0.
*/
if (src_regs_are_constant(inst, 3)) {
float a[4];
float b[4];
float c[4];
float result[4];
get_value(prog, &inst->SrcReg[0], a);
get_value(prog, &inst->SrcReg[1], b);
get_value(prog, &inst->SrcReg[2], c);
result[0] = a[0] < 0.0f ? b[0] : c[0];
result[1] = a[1] < 0.0f ? b[1] : c[1];
result[2] = a[2] < 0.0f ? b[2] : c[2];
result[3] = a[3] < 0.0f ? b[3] : c[3];
inst->Opcode = OPCODE_MOV;
inst->SrcReg[0] = src_reg_for_vec4(prog, result);
inst->SrcReg[1].File = PROGRAM_UNDEFINED;
inst->SrcReg[1].Swizzle = SWIZZLE_NOOP;
inst->SrcReg[2].File = PROGRAM_UNDEFINED;
inst->SrcReg[2].Swizzle = SWIZZLE_NOOP;
progress = true;
}
break;
case OPCODE_DP2:
case OPCODE_DP3:
case OPCODE_DP4:
if (src_regs_are_constant(inst, 2)) {
float a[4];
float b[4];
float result;
get_value(prog, &inst->SrcReg[0], a);
get_value(prog, &inst->SrcReg[1], b);
result = (a[0] * b[0]) + (a[1] * b[1]);
if (inst->Opcode >= OPCODE_DP3)
result += a[2] * b[2];
if (inst->Opcode == OPCODE_DP4)
result += a[3] * b[3];
inst->Opcode = OPCODE_MOV;
inst->SrcReg[0] = src_reg_for_float(prog, result);
inst->SrcReg[1].File = PROGRAM_UNDEFINED;
inst->SrcReg[1].Swizzle = SWIZZLE_NOOP;
progress = true;
}
break;
case OPCODE_MUL:
if (src_regs_are_constant(inst, 2)) {
float a[4];
float b[4];
float result[4];
get_value(prog, &inst->SrcReg[0], a);
get_value(prog, &inst->SrcReg[1], b);
result[0] = a[0] * b[0];
result[1] = a[1] * b[1];
result[2] = a[2] * b[2];
result[3] = a[3] * b[3];
inst->Opcode = OPCODE_MOV;
inst->SrcReg[0] = src_reg_for_vec4(prog, result);
inst->SrcReg[1].File = PROGRAM_UNDEFINED;
inst->SrcReg[1].Swizzle = SWIZZLE_NOOP;
progress = true;
}
break;
case OPCODE_SGE:
if (src_regs_are_constant(inst, 2)) {
float a[4];
float b[4];
float result[4];
get_value(prog, &inst->SrcReg[0], a);
get_value(prog, &inst->SrcReg[1], b);
result[0] = (a[0] >= b[0]) ? 1.0f : 0.0f;
result[1] = (a[1] >= b[1]) ? 1.0f : 0.0f;
result[2] = (a[2] >= b[2]) ? 1.0f : 0.0f;
result[3] = (a[3] >= b[3]) ? 1.0f : 0.0f;
inst->Opcode = OPCODE_MOV;
inst->SrcReg[0] = src_reg_for_vec4(prog, result);
inst->SrcReg[1].File = PROGRAM_UNDEFINED;
inst->SrcReg[1].Swizzle = SWIZZLE_NOOP;
progress = true;
} else if (src_regs_are_same(&inst->SrcReg[0], &inst->SrcReg[1])) {
inst->Opcode = OPCODE_MOV;
inst->SrcReg[0] = src_reg_for_float(prog, 1.0f);
inst->SrcReg[1].File = PROGRAM_UNDEFINED;
inst->SrcReg[1].Swizzle = SWIZZLE_NOOP;
progress = true;
}
break;
case OPCODE_SLT:
if (src_regs_are_constant(inst, 2)) {
float a[4];
float b[4];
float result[4];
get_value(prog, &inst->SrcReg[0], a);
get_value(prog, &inst->SrcReg[1], b);
result[0] = (a[0] < b[0]) ? 1.0f : 0.0f;
result[1] = (a[1] < b[1]) ? 1.0f : 0.0f;
result[2] = (a[2] < b[2]) ? 1.0f : 0.0f;
result[3] = (a[3] < b[3]) ? 1.0f : 0.0f;
inst->Opcode = OPCODE_MOV;
inst->SrcReg[0] = src_reg_for_vec4(prog, result);
inst->SrcReg[1].File = PROGRAM_UNDEFINED;
inst->SrcReg[1].Swizzle = SWIZZLE_NOOP;
progress = true;
} else if (src_regs_are_same(&inst->SrcReg[0], &inst->SrcReg[1])) {
inst->Opcode = OPCODE_MOV;
inst->SrcReg[0] = src_reg_for_float(prog, 0.0f);
inst->SrcReg[1].File = PROGRAM_UNDEFINED;
inst->SrcReg[1].Swizzle = SWIZZLE_NOOP;
progress = true;
}
break;
default:
break;
}
}
return progress;
}
|
