110 lines
2.2 KiB
C
110 lines
2.2 KiB
C
/* Tune the Karatsuba parameters
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*
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* Tom St Denis, tomstdenis@iahu.ca
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*/
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#include <tommath.h>
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#include <time.h>
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#ifndef X86_TIMER
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/* generic ISO C timer */
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unsigned long long __T;
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void t_start(void) { __T = clock(); }
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unsigned long long t_read(void) { return clock() - __T; }
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#else
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extern void t_start(void);
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extern unsigned long long t_read(void);
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#endif
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unsigned long long
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time_mult (void)
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{
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int x, y;
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mp_int a, b, c;
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mp_init (&a);
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mp_init (&b);
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mp_init (&c);
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t_start();
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for (x = 32; x <= 288; x += 4) {
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mp_rand (&a, x);
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mp_rand (&b, x);
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for (y = 0; y < 100; y++) {
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mp_mul (&a, &b, &c);
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}
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}
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mp_clear (&a);
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mp_clear (&b);
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mp_clear (&c);
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return t_read();
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}
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unsigned long long
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time_sqr (void)
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{
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int x, y;
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mp_int a, b;
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mp_init (&a);
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mp_init (&b);
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t_start();
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for (x = 32; x <= 288; x += 4) {
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mp_rand (&a, x);
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for (y = 0; y < 100; y++) {
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mp_sqr (&a, &b);
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}
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}
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mp_clear (&a);
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mp_clear (&b);
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return t_read();
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}
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int
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main (void)
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{
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int best_mult, best_square;
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unsigned long long best, ti;
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FILE *log;
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best_mult = best_square = 0;
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/* tune multiplication first */
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log = fopen ("mult.log", "w");
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best = -1;
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for (KARATSUBA_MUL_CUTOFF = 8; KARATSUBA_MUL_CUTOFF <= 200; KARATSUBA_MUL_CUTOFF++) {
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ti = time_mult ();
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printf ("%4d : %9llu\r", KARATSUBA_MUL_CUTOFF, ti);
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fprintf (log, "%d, %llu\n", KARATSUBA_MUL_CUTOFF, ti);
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fflush (stdout);
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if (ti < best) {
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printf ("New best: %llu, %d \n", ti, KARATSUBA_MUL_CUTOFF);
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best = ti;
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best_mult = KARATSUBA_MUL_CUTOFF;
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}
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}
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fclose (log);
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/* tune squaring */
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log = fopen ("sqr.log", "w");
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best = -1;
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for (KARATSUBA_SQR_CUTOFF = 8; KARATSUBA_SQR_CUTOFF <= 200; KARATSUBA_SQR_CUTOFF++) {
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ti = time_sqr ();
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printf ("%4d : %9llu\r", KARATSUBA_SQR_CUTOFF, ti);
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fprintf (log, "%d, %llu\n", KARATSUBA_SQR_CUTOFF, ti);
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fflush (stdout);
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if (ti < best) {
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printf ("New best: %llu, %d \n", ti, KARATSUBA_SQR_CUTOFF);
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best = ti;
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best_square = KARATSUBA_SQR_CUTOFF;
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}
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}
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fclose (log);
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printf
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("\n\n\nKaratsuba Multiplier Cutoff: %d\nKaratsuba Squaring Cutoff: %d\n",
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best_mult, best_square);
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return 0;
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}
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