1  /* High precision, low overhead timing functions.
       2     Copyright (C) 2022-2023 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_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 */