sysdeps/alpha/hp-timing.h

   1 /* High precision, low overhead timing functions.  Alpha version.
   2    Copyright (C) 2001-2015 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Richard Henderson <rth@redhat.com>, 2001.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library.  If not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef _HP_TIMING_H
  21 #define _HP_TIMING_H    1
  22
  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_AVAIL         (0)
  26 #define HP_SMALL_TIMING_AVAIL   (1)
  27
  28 /* We indeed have inlined functions.  */
  29 #define HP_TIMING_INLINE        (1)
  30
  31 /* We use 32 bit values for the times.  */
  32 typedef unsigned int hp_timing_t;
  33
  34 /* The "rpcc" instruction returns a 32-bit counting half and a 32-bit
  35    "virtual cycle counter displacement".  Subtracting the two gives us
  36    a virtual cycle count.  */
  37 #define HP_TIMING_NOW(VAR) \
  38   do {                                                                        \
  39     unsigned long int x_;                                                     \
  40     asm volatile ("rpcc %0" : "=r"(x_));                                      \
  41     (VAR) = (int) (x_) - (int) (x_ >> 32);                                    \
  42   } while (0)
  43
  44 #include <hp-timing-common.h>
  45
  46 #endif  /* hp-timing.h */