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
|
/*
* Copyright © 2015 Connor Abbott
*
* 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_cfg.h"
#include "brw_fs_builder.h"
using namespace brw;
static bool
supports_type_conversion(const fs_inst *inst) {
switch (inst->opcode) {
case BRW_OPCODE_MOV:
case SHADER_OPCODE_MOV_INDIRECT:
return true;
case BRW_OPCODE_SEL:
return inst->dst.type == get_exec_type(inst);
default:
/* FIXME: We assume the opcodes don't explicitly mentioned
* before just work fine with arbitrary conversions.
*/
return true;
}
}
/* From the SKL PRM Vol 2a, "Move":
*
* "A mov with the same source and destination type, no source modifier,
* and no saturation is a raw move. A packed byte destination region (B
* or UB type with HorzStride == 1 and ExecSize > 1) can only be written
* using raw move."
*/
static bool
is_byte_raw_mov (const fs_inst *inst)
{
return type_sz(inst->dst.type) == 1 &&
inst->opcode == BRW_OPCODE_MOV &&
inst->src[0].type == inst->dst.type &&
!inst->saturate &&
!inst->src[0].negate &&
!inst->src[0].abs;
}
bool
fs_visitor::lower_conversions()
{
bool progress = false;
foreach_block_and_inst(block, fs_inst, inst, cfg) {
const fs_builder ibld(this, block, inst);
fs_reg dst = inst->dst;
bool saturate = inst->saturate;
if (supports_type_conversion(inst)) {
if (type_sz(inst->dst.type) < get_exec_type_size(inst) &&
!is_byte_raw_mov(inst)) {
/* From the Broadwell PRM, 3D Media GPGPU, "Double Precision Float to
* Single Precision Float":
*
* The upper Dword of every Qword will be written with undefined
* value when converting DF to F.
*
* So we need to allocate a temporary that's two registers, and then do
* a strided MOV to get the lower DWord of every Qword that has the
* result.
*
* This restriction applies, in general, whenever we convert to
* a type with a smaller bit-size.
*/
fs_reg temp = ibld.vgrf(get_exec_type(inst));
fs_reg strided_temp = subscript(temp, dst.type, 0);
assert(inst->size_written == inst->dst.component_size(inst->exec_size));
inst->dst = strided_temp;
inst->saturate = false;
/* As it is an strided destination, we write n-times more being n the
* size ratio between source and destination types. Update
* size_written accordingly.
*/
inst->size_written = inst->dst.component_size(inst->exec_size);
fs_inst *mov = ibld.at(block, inst->next).MOV(dst, strided_temp);
mov->saturate = saturate;
mov->predicate = inst->predicate;
progress = true;
}
} else {
fs_reg temp0 = ibld.vgrf(get_exec_type(inst));
assert(inst->size_written == inst->dst.component_size(inst->exec_size));
inst->dst = temp0;
/* As it is an strided destination, we write n-times more being n the
* size ratio between source and destination types. Update
* size_written accordingly.
*/
inst->size_written = inst->dst.component_size(inst->exec_size);
inst->saturate = false;
/* Now, do the conversion to original destination's type. In next iteration,
* we will lower it if it is a d2f conversion.
*/
ibld.at(block, inst->next).MOV(dst, temp0)->saturate = saturate;
progress = true;
}
}
if (progress)
invalidate_live_intervals();
return progress;
}
|
