1  /* High precision, low overhead timing functions.  Alpha version.
       2     Copyright (C) 2001-2023 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_ALPHA_H
      20  #define _HP_TIMING_ALPHA_H	1
      21  
      22  #if IS_IN(rtld)
      23  /* We always have the timestamp register, but it's got only a 4 second
      24     range.  Use it for ld.so profiling only.  */
      25  # define HP_TIMING_INLINE	(1)
      26  
      27  /* We use 32 bit values for the times.  */
      28  typedef unsigned int hp_timing_t;
      29  
      30  /* The "rpcc" instruction returns a 32-bit counting half and a 32-bit
      31     "virtual cycle counter displacement".  Subtracting the two gives us
      32     a virtual cycle count.  */
      33  # define HP_TIMING_NOW(VAR) \
      34    do {									      \
      35      unsigned long int x_;						      \
      36      asm volatile ("rpcc %0" : "=r"(x_));				      \
      37      (VAR) = (int) (x_) - (int) (x_ >> 32);				      \
      38    } while (0)
      39  # include <hp-timing-common.h>
      40  
      41  #else
      42  # include <sysdeps/generic/hp-timing.h>
      43  #endif /* IS_IN(rtld)  */
      44  
      45  #endif	/* hp-timing.h */