1/* High precision, low overhead timing functions. Generic version.
2 Copyright (C) 1998-2023 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19/* In case a platform supports timers in the hardware the following macros
20 and types must be defined:
21
22 - HP_TIMING_INLINE: this macro is non-zero if the functionality is not
23 implemented using function calls but instead uses some inlined code
24 which might simply consist of a few assembler instructions. We have to
25 know this since we might want to use the macros here in places where we
26 cannot make function calls.
27
28 - hp_timing_t: This is the type for variables used to store the time
29 values. This type must be integral.
30
31 - HP_TIMING_NOW: place timestamp for current time in variable given as
32 parameter.
33*/
34
35/* The target supports hp-timing. Share the common infrastructure. */
36
37#include <string.h>
38#include <sys/param.h>
39#include <_itoa.h>
40
41/* Compute the difference between START and END, storing into DIFF. */
42#define HP_TIMING_DIFF(Diff, Start, End) ((Diff) = (End) - (Start))
43
44/* Accumulate ADD into SUM. No attempt is made to be thread-safe. */
45#define HP_TIMING_ACCUM_NT(Sum, Diff) ((Sum) += (Diff))
46
47#define HP_TIMING_PRINT_SIZE (3 * sizeof (hp_timing_t) + 1)
48
49/* Write a decimal representation of the timing value into the given string. */
50#define HP_TIMING_PRINT(Dest, Len, Val) \
51 do { \
52 char __buf[HP_TIMING_PRINT_SIZE]; \
53 char *__dest = (Dest); \
54 size_t __len = (Len); \
55 char *__cp = _itoa ((Val), __buf + sizeof (__buf), 10, 0); \
56 size_t __cp_len = MIN (__buf + sizeof (__buf) - __cp, __len); \
57 memcpy (__dest, __cp, __cp_len); \
58 __dest[__cp_len - 1] = '\0'; \
59 } while (0)
60