1 /* High precision, low overhead timing functions.
2    Copyright (C) 2022 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 #ifndef _HP_TIMING_H
20 #define _HP_TIMING_H 1
21 
22 /* We always assume having the timestamp register.  */
23 #define HP_TIMING_AVAIL (1)
24 #define HP_SMALL_TIMING_AVAIL (1)
25 
26 /* We indeed have inlined functions.  */
27 #define HP_TIMING_INLINE (1)
28 
29 /* We use 64bit values for the times.  */
30 typedef unsigned long long int hp_timing_t;
31 
32 /* Read the stable counter.  */
33 #define HP_TIMING_NOW(Var) \
34   ({ \
35     unsigned long long int _count; \
36     asm volatile ("rdtime.d\t%0,$r0" : "=r" (_count)); \
37     (Var) = _count; \
38   })
39 
40 #include <hp-timing-common.h>
41 
42 #endif /* hp-timing.h */
43