30 lines
868 B
C
30 lines
868 B
C
/* benchmul - benchmark for int multiply
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* Thomas Plum, Plum Hall Inc, 609-927-3770
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* If machine traps overflow, use an unsigned type
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* Let T be the execution time in milliseconds
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* Then average time per operator = T/major usec
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* (Because the inner loop has exactly 1000 operations)
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*/
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#define STOR_CL auto
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#define TYPE int
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#include <stdio.h>
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main(int ac, char *av[])
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{ STOR_CL TYPE a, b, c;
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long d, major;
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printf ("enter number of iterations\n");
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scanf ("%ld", &major);
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printf("executing %ld iterations\n", major);
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scanf ("%d", &a);
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scanf ("%d", &b);
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for (d = 1; d <= major; ++d)
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{
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/* inner loop executes 1000 selected operations */
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for (c = 1; c <= 40; ++c)
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{
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a = 3 *a*a*a*a*a*a*a*a * a*a*a*a*a*a*a*a * a*a*a*a*a*a*a*a * a; /* 25 * */
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}
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}
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printf("a=%d\n", a);
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}
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