1 /* High precision, low overhead timing functions. s390 version.
2 Copyright (C) 2019-2020 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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.
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.
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/>. */
19 #ifndef _HP_TIMING_S390_H
20 #define _HP_TIMING_S390_H 1
22 /* The stckf instruction is available starting with z9-109 zarch CPUs.
23 As there is no extra configure check for z9-109, the z10 one is used. */
24 #ifdef HAVE_S390_MIN_Z10_ZARCH_ASM_SUPPORT
25 # include <hp-timing-common.h>
27 /* We use 64 bit values for the times.
28 Note: Bit 51 is incremented every 0.000 001s = 1us. */
29 typedef unsigned long long int hp_timing_t
;
31 # define HP_TIMING_INLINE (1)
33 # define HP_TIMING_NOW(VAR) \
35 __asm__ __volatile__ ("stckf %0" : "=Q" (VAR) : : "cc"); \
39 # include_next <hp-timing.h>
42 #endif /* hp-timing.h */