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
|
/*
* Copyright © 2012 Siarhei Siamashka <siarhei.siamashka@gmail.com>
*
* 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.
*/
/*
* This program tries to stress ARM Cortex-A8 processor to generate as
* much heat as possible.
* WARNING: improperly cooled or otherwise flawed hardware may potentially
* overheat and fail. Use at your own risk.
*
* Compilation instructions:
* $ arm-linux-gnueabihf-gcc -o cpuburn-a8 cpuburn-a8.S
*
* See http://ssvb.github.com/2012/04/10/cpuburn-arm-cortex-a9.html
* for more details.
*/
.syntax unified
.text
.arch armv7-a
.fpu neon
.thumb
.global main
/* optimal value for LOOP_UNROLL_FACTOR seems to be BTB size dependent */
#define LOOP_UNROLL_FACTOR 130
/* 16 seems to be a good choice */
#define STEP 16
.func main
.thumb_func
main:
mov lr, pc
adds lr, lr, #63
bic lr, lr, #63
mov ip, #STEP
.p2align 2
0:
.rept LOOP_UNROLL_FACTOR
vld2.8 {q0}, [lr, :128], ip
vaba.u8 q4, q4, q3
bne 1f
1: vld2.8 {q1}, [lr, :128], ip
vaba.u8 q5, q5, q0
vld2.8 {q2}, [lr, :128], ip
vaba.u8 q6, q6, q1
bne 1f
1: vld2.8 {q3}, [lr, :128], ip
vaba.u8 q7, q7, q2
smuad r0, r1, r2
subs lr, lr, #(STEP * 4)
.endr
bne 0b
.endfunc
|
