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
|
/*
* Copyright © 2014 Broadcom
*
* 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.
*/
/**
* @file vc4_opt_coalesce_ff_writes.c
*
* This modifies instructions that generate the value consumed by a VPM or TMU
* coordinate write to write directly into the VPM or TMU.
*/
#include "vc4_qir.h"
bool
qir_opt_coalesce_ff_writes(struct vc4_compile *c)
{
/* For now, only do this pass when we don't have control flow. */
struct qblock *block = qir_entry_block(c);
if (block != qir_exit_block(c))
return false;
bool progress = false;
uint32_t use_count[c->num_temps];
memset(&use_count, 0, sizeof(use_count));
qir_for_each_inst_inorder(inst, c) {
for (int i = 0; i < qir_get_nsrc(inst); i++) {
if (inst->src[i].file == QFILE_TEMP) {
uint32_t temp = inst->src[i].index;
use_count[temp]++;
}
}
}
qir_for_each_inst_inorder(mov_inst, c) {
if (!qir_is_raw_mov(mov_inst) || mov_inst->sf)
continue;
if (mov_inst->src[0].file != QFILE_TEMP)
continue;
if (!(mov_inst->dst.file == QFILE_VPM ||
mov_inst->dst.file == QFILE_TLB_COLOR_WRITE ||
mov_inst->dst.file == QFILE_TLB_COLOR_WRITE_MS ||
qir_is_tex(mov_inst)))
continue;
uint32_t temp = mov_inst->src[0].index;
if (use_count[temp] != 1)
continue;
struct qinst *inst = c->defs[temp];
if (!inst)
continue;
/* Don't bother trying to fold in an ALU op using a uniform to
* a texture op, as we'll just have to lower the uniform back
* out.
*/
if (qir_is_tex(mov_inst) && qir_has_uniform_read(inst))
continue;
if (qir_depends_on_flags(inst) || inst->sf)
continue;
if (qir_has_side_effects(c, inst) ||
qir_has_side_effect_reads(c, inst) ||
inst->op == QOP_TLB_COLOR_READ ||
inst->op == QOP_VARY_ADD_C) {
continue;
}
/* Move the generating instruction into the position of the FF
* write.
*/
c->defs[inst->dst.index] = NULL;
inst->dst.file = mov_inst->dst.file;
inst->dst.index = mov_inst->dst.index;
if (qir_has_implicit_tex_uniform(mov_inst)) {
inst->src[qir_get_tex_uniform_src(inst)] =
mov_inst->src[qir_get_tex_uniform_src(mov_inst)];
}
list_del(&inst->link);
list_addtail(&inst->link, &mov_inst->link);
qir_remove_instruction(c, mov_inst);
progress = true;
}
return progress;
}
|
