sysdeps/s390/hp-timing.h

   1 /* High precision, low overhead timing functions.  s390 version.
   2    Copyright (C) 2019-2023 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 #ifndef _HP_TIMING_S390_H
  20 #define _HP_TIMING_S390_H       1
  21
  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>
  26
  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;
  30
  31 # define HP_TIMING_INLINE       (1)
  32
  33 # define HP_TIMING_NOW(VAR)                                             \
  34   do {                                                                  \
  35     __asm__ __volatile__ ("stckf %0" : "=Q" (VAR) : : "cc");            \
  36   } while (0)
  37
  38 #else
  39 # include_next <hp-timing.h>
  40 #endif
  41
  42 #endif  /* hp-timing.h */