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
|
/*
* Copyright © 2013 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 "brw_fs.h"
#include "brw_fs_live_variables.h"
#include "brw_cfg.h"
/** @file brw_fs_saturate_propagation.cpp
*/
static bool
opt_saturate_propagation_local(fs_visitor *v, bblock_t *block)
{
bool progress = false;
int ip = block->start_ip - 1;
foreach_inst_in_block(fs_inst, inst, block) {
ip++;
if (inst->opcode != BRW_OPCODE_MOV ||
inst->dst.file != GRF ||
inst->src[0].file != GRF ||
inst->src[0].abs ||
inst->src[0].negate ||
!inst->saturate)
continue;
int src_var = v->live_intervals->var_from_reg(&inst->src[0]);
int src_end_ip = v->live_intervals->end[src_var];
int scan_ip = ip;
bool interfered = false;
for (fs_inst *scan_inst = (fs_inst *) inst->prev;
scan_inst != block->start->prev;
scan_inst = (fs_inst *) scan_inst->prev) {
scan_ip--;
if (scan_inst->dst.file == GRF &&
scan_inst->dst.reg == inst->src[0].reg &&
scan_inst->dst.reg_offset == inst->src[0].reg_offset &&
!scan_inst->is_partial_write()) {
if (scan_inst->saturate) {
inst->saturate = false;
progress = true;
} else if (src_end_ip <= ip || inst->dst.equals(inst->src[0])) {
if (scan_inst->can_do_saturate()) {
scan_inst->saturate = true;
inst->saturate = false;
progress = true;
}
}
break;
}
for (int i = 0; i < scan_inst->sources; i++) {
if (scan_inst->src[i].file == GRF &&
scan_inst->src[i].reg == inst->src[0].reg &&
scan_inst->src[i].reg_offset == inst->src[0].reg_offset) {
interfered = true;
break;
}
}
if (interfered)
break;
}
}
return progress;
}
bool
fs_visitor::opt_saturate_propagation()
{
bool progress = false;
cfg_t cfg(&instructions);
calculate_live_intervals(&cfg);
for (int b = 0; b < cfg.num_blocks; b++) {
progress = opt_saturate_propagation_local(this, cfg.blocks[b])
|| progress;
}
if (progress)
invalidate_live_intervals();
return progress;
}
|
