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
|
/*
* Mesa 3-D graphics library
*
* Copyright (C) 2012-2013 LunarG, Inc.
*
* 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 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:
* Chia-I Wu <olv@lunarg.com>
*/
#include "toy_compiler.h"
#include "toy_tgsi.h"
#include "toy_optimize.h"
/**
* This just eliminates instructions with null dst so far.
*/
static void
eliminate_dead_code(struct toy_compiler *tc)
{
struct toy_inst *inst;
tc_head(tc);
while ((inst = tc_next(tc)) != NULL) {
switch (inst->opcode) {
case GEN6_OPCODE_IF:
case GEN6_OPCODE_ELSE:
case GEN6_OPCODE_ENDIF:
case GEN6_OPCODE_WHILE:
case GEN6_OPCODE_BREAK:
case GEN6_OPCODE_CONT:
case GEN6_OPCODE_SEND:
case GEN6_OPCODE_SENDC:
case GEN6_OPCODE_NOP:
/* never eliminated */
break;
default:
if (tdst_is_null(inst->dst) || !inst->dst.writemask) {
/* math is always GEN6_COND_NORMAL */
if ((inst->opcode == GEN6_OPCODE_MATH ||
inst->cond_modifier == GEN6_COND_NONE) &&
!inst->acc_wr_ctrl)
tc_discard_inst(tc, inst);
}
break;
}
}
}
void
toy_compiler_optimize(struct toy_compiler *tc)
{
eliminate_dead_code(tc);
}
|
