blob: 66a677ac9b481fa92c8890b062ace7b96f4011ad (
plain)
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
|
/* Benchmark utility functions.
Copyright (C) 2015-2024 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
/* Prevent compiler to optimize away call. */
#define DO_NOT_OPTIMIZE_OUT(value) \
({ \
__typeof (value) __v = (value); \
asm volatile ("" : : "r,m" (__v) : "memory"); \
__v; \
})
#if __GNUC_PREREQ (4, 4) || __glibc_has_attribute (__optimize__)
# define attribute_optimize(level) __attribute__ ((optimize (level)))
#else
# define attribute_optimize(level)
#endif
#ifndef START_ITER
# define START_ITER (100000000)
#endif
/* bench_start reduces the random variations due to frequency scaling by
executing a small loop with many memory accesses. START_ITER controls
the number of iterations. */
void bench_start (void);
|
