polly/lib/External/isl/imath/imtimer.c

   1 /*
   2   Name:     imtimer.c
   3   Purpose:  Timing tests for the imath library.
   4   Author:   M. J. Fromberger
   5
   6   Copyright (C) 2002-2008 Michael J. Fromberger, All Rights Reserved.
   7
   8   Permission is hereby granted, free of charge, to any person obtaining a copy
   9   of this software and associated documentation files (the "Software"), to deal
  10   in the Software without restriction, including without limitation the rights
  11   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  12   copies of the Software, and to permit persons to whom the Software is
  13   furnished to do so, subject to the following conditions:
  14
  15   The above copyright notice and this permission notice shall be included in
  16   all copies or substantial portions of the Software.
  17
  18   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
  21   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  22   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  23   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  24   SOFTWARE.
  25  */
  26
  27 #include <limits.h>
  28 #include <stdio.h>
  29 #include <stdlib.h>
  30 #include <string.h>
  31 #include <time.h>
  32
  33 #include <getopt.h>
  34 #include <unistd.h>
  35
  36 #include "imath.h"
  37
  38 double clocks_to_seconds(clock_t start, clock_t end);
  39 double get_multiply_time(int nt, int prec);
  40 double get_exptmod_time(int nt, int prec);
  41 mp_int alloc_values(int nt, int prec);
  42 void randomize_values(mp_int values, int nt, int prec);
  43 void release_values(mp_int values, int nt);
  44 void mp_int_random(mp_int z, int prec);
  45
  46 const int g_mul_factor = 1000;
  47
  48 int main(int argc, char *argv[]) {
  49   int do_mul = 0, do_exp = 0, do_header = 1;
  50   int num_tests, precision = 0, opt;
  51   mp_size threshold = 0;
  52   unsigned int seed = (unsigned int)time(NULL);
  53
  54   while ((opt = getopt(argc, argv, "ehmnp:s:t:")) != EOF) {
  55     switch (opt) {
  56       case 'e':
  57         do_exp = 1;
  58         break;
  59       case 'm':
  60         do_mul = 1;
  61         break;
  62       case 'n':
  63         do_header = 0;
  64         break;
  65       case 'p':
  66         precision = atoi(optarg);
  67         break;
  68       case 's':
  69         seed = atoi(optarg);
  70         break;
  71       case 't':
  72         threshold = (mp_size)atoi(optarg);
  73         break;
  74       default:
  75         fprintf(stderr,
  76                 "Usage:  imtimer [options] <num-tests>\n\n"
  77                 "Options understood:\n"
  78                 " -e        -- test modular exponentiation speed.\n"
  79                 " -h        -- display this help message.\n"
  80                 " -m        -- test multiplication speed.\n"
  81                 " -n        -- no header line.\n"
  82                 " -p <dig>  -- use values with <dig> digits.\n"
  83                 " -s <rnd>  -- set random seed to <rnd>.\n"
  84                 " -t <dig>  -- set recursion threshold to <dig> digits.\n\n");
  85         return (opt != 'h');
  86     }
  87   }
  88
  89   if (optind >= argc) {
  90     fprintf(stderr,
  91             "Usage:  imtimer [options] <num-tests>\n"
  92             "[use \"imtimer -h\" for help with options]\n\n");
  93     return 1;
  94   } else
  95     num_tests = atoi(argv[optind]);
  96
  97   srand(seed);
  98
  99   if (num_tests <= 0) {
 100     fprintf(stderr, "You must request at least one test.\n");
 101     return 1;
 102   }
 103   if (precision < 0) {
 104     fprintf(stderr, "Precision must be non-negative (0 means default).\n");
 105     return 1;
 106   }
 107   mp_int_multiply_threshold(threshold);
 108
 109   if (do_header) printf("NUM\tPREC\tBITS\tREC\tRESULT\n");
 110   printf("%d\t%d\t%d\t%u", num_tests, precision,
 111          (int)(precision * MP_DIGIT_BIT), threshold);
 112
 113   if (do_mul) {
 114     double m_time = get_multiply_time(num_tests, precision);
 115
 116     printf("\tMUL %.3f %.3f", m_time, m_time / num_tests);
 117   }
 118
 119   if (do_exp) {
 120     double e_time = get_exptmod_time(num_tests, precision);
 121
 122     printf("\tEXP %.3f %.3f", e_time, e_time / num_tests);
 123   }
 124   fputc('\n', stdout);
 125   fflush(stdout);
 126
 127   return 0;
 128 }
 129
 130 double clocks_to_seconds(clock_t start, clock_t end) {
 131   return (double)(end - start) / CLOCKS_PER_SEC;
 132 }
 133
 134 mp_int alloc_values(int nt, int prec) {
 135   mp_int out = malloc(nt * sizeof(mpz_t));
 136   int i;
 137
 138   if (out == NULL) return NULL;
 139
 140   for (i = 0; i < nt; ++i) {
 141     if (mp_int_init_size(out + i, prec) != MP_OK) {
 142       while (--i >= 0) mp_int_clear(out + i);
 143       return NULL;
 144     }
 145   }
 146
 147   return out;
 148 }
 149
 150 void randomize_values(mp_int values, int nt, int prec) {
 151   int i;
 152
 153   for (i = 0; i < nt; ++i) mp_int_random(values + i, prec);
 154 }
 155
 156 void release_values(mp_int values, int nt) {
 157   int i;
 158
 159   for (i = 0; i < nt; ++i) mp_int_clear(values + i);
 160
 161   free(values);
 162 }
 163
 164 double get_multiply_time(int nt, int prec) {
 165   clock_t start, end;
 166   mp_int values;
 167   int i;
 168
 169   if ((values = alloc_values(3, prec)) == NULL) return 0.0;
 170   randomize_values(values, 2, prec);
 171
 172   start = clock();
 173   for (i = 0; i < nt; ++i) mp_int_mul(values, values + 1, values + 2);
 174   end = clock();
 175
 176   release_values(values, 3);
 177
 178   return clocks_to_seconds(start, end);
 179 }
 180
 181 double get_exptmod_time(int nt, int prec) {
 182   clock_t start, end;
 183   mp_int values;
 184   int i;
 185
 186   if ((values = alloc_values(4, prec)) == NULL) return 0.0;
 187   randomize_values(values, 3, prec);
 188
 189   start = clock();
 190   for (i = 0; i < nt; ++i)
 191     mp_int_exptmod(values, values + 1, values + 2, values + 3);
 192   end = clock();
 193
 194   release_values(values, 4);
 195
 196   return clocks_to_seconds(start, end);
 197 }
 198
 199 void mp_int_random(mp_int z, int prec) {
 200   int i;
 201
 202   if (prec > (int)MP_ALLOC(z)) prec = (int)MP_ALLOC(z);
 203
 204   for (i = 0; i < prec; ++i) {
 205     mp_digit d = 0;
 206     int j;
 207
 208     for (j = 0; j < (int)sizeof(d); ++j) {
 209       d = (d << CHAR_BIT) | (rand() & UCHAR_MAX);
 210     }
 211
 212     z->digits[i] = d;
 213   }
 214   z->used = prec;
 215 }