benchtests/bench-timing.h

   1 /* Define timing macros.
   2    Copyright (C) 2013-2018 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    <http://www.gnu.org/licenses/>.  */
  18
  19 #undef attribute_hidden
  20 #define attribute_hidden
  21 #include <hp-timing.h>
  22 #include <stdint.h>
  23
  24 #if HP_TIMING_AVAIL && !defined USE_CLOCK_GETTIME
  25 # define GL(x) _##x
  26 # define GLRO(x) _##x
  27 typedef hp_timing_t timing_t;
  28
  29 # define TIMING_TYPE "hp_timing"
  30
  31 # define TIMING_INIT(res) ({ (res) = 1; })
  32
  33 # define TIMING_NOW(var) HP_TIMING_NOW (var)
  34 # define TIMING_DIFF(diff, start, end) HP_TIMING_DIFF ((diff), (start), (end))
  35 # define TIMING_ACCUM(sum, diff) HP_TIMING_ACCUM_NT ((sum), (diff))
  36
  37 #else
  38
  39 #include <time.h>
  40 typedef uint64_t timing_t;
  41
  42 # define TIMING_TYPE "clock_gettime"
  43
  44 /* Measure the resolution of the clock so we can scale the number of
  45    benchmark iterations by this value.  */
  46 # define TIMING_INIT(res) \
  47 ({                                                                            \
  48   struct timespec start;                                                      \
  49   clock_getres (CLOCK_PROCESS_CPUTIME_ID, &start);                            \
  50   (res) = start.tv_nsec;                                              \
  51 })
  52
  53 # define TIMING_NOW(var) \
  54 ({                                                                            \
  55   struct timespec tv;                                                         \
  56   clock_gettime (CLOCK_PROCESS_CPUTIME_ID, &tv);                              \
  57   (var) = (uint64_t) (tv.tv_nsec + (uint64_t) 1000000000 * tv.tv_sec);        \
  58 })
  59
  60 # define TIMING_DIFF(diff, start, end) (diff) = (end) - (start)
  61 # define TIMING_ACCUM(sum, diff) (sum) += (diff)
  62
  63 #endif
  64
  65 #define TIMING_PRINT_MEAN(d_total_s, d_iters) \
  66   printf ("\t%g", (d_total_s) / (d_iters))