78 lines
2.1 KiB
C
78 lines
2.1 KiB
C
/* Copyright (C) 2021 Free Software Foundation, Inc.
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Contributed by Oracle.
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This file is part of GNU Binutils.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, 51 Franklin Street - Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#include <stdio.h>
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#include <stdlib.h>
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#include "stopwatch.h"
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/* The random number generator below is adapted from Kernighan and Ritchie,
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* "C Programming Language", Second Edition, p. 46.
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*/
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#define IA 1103515245u
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#define IC 12345u
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#define IM 2147483648u
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static unsigned int current_random = 1;
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static int
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my_irand (int imax)
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{
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/* Create a random integer between 0 and imax, inclusive. i.e. [0..imax] */
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/* Use overflow to wrap */
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current_random = current_random * IA + IC;
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int ival = current_random & (IM - 1); /* Modulus */
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ival = (int) ((float) ival * (float) (imax + 0.999) / (float) IM);
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return ival;
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}
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#define N 6000000
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int
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fitos (int n)
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{
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int i, k, retv;
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hrtime_t start = gethrtime ();
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hrtime_t vstart = gethrvtime ();
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/* Log the event */
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wlog ("start of fitos", NULL);
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if (n <= 0)
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n = 1;
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int max = N * n;
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long long count = 0;
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do
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{
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for (current_random = 1, i = retv = k = 0; i < max; i++)
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{
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retv += my_irand (100);
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k += (current_random & (IM - 1)) >= (1 << 22);
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}
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count++;
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}
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while (start + testtime * 1e9 > gethrtime ());
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fprintf (stderr, "\t\t%d out of a total of %d >= 2^22 (%d)\n", k, max, retv);
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fprintf (stderr, " Performed %lld while-loop iterations\n", count);
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whrvlog ((gethrtime () - start), (gethrvtime () - vstart), "fitos", NULL);
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return 0;
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}
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