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/* Copyright (C) 2021-2023 Free Software Foundation, Inc.
Contributed by Oracle.
This file is part of GNU Binutils.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, 51 Franklin Street - Fifth Floor, Boston,
MA 02110-1301, USA. */
#include <stdio.h>
#include <stdlib.h>
#include "stopwatch.h"
/* The random number generator below is adapted from Kernighan and Ritchie,
* "C Programming Language", Second Edition, p. 46.
*/
#define IA 1103515245u
#define IC 12345u
#define IM 2147483648u
static unsigned int current_random = 1;
static int
my_irand (int imax)
{
/* Create a random integer between 0 and imax, inclusive. i.e. [0..imax] */
/* Use overflow to wrap */
current_random = current_random * IA + IC;
int ival = current_random & (IM - 1); /* Modulus */
ival = (int) ((float) ival * (float) (imax + 0.999) / (float) IM);
return ival;
}
#define N 6000000
int
fitos (int n)
{
int i, k, retv;
hrtime_t start = gethrtime ();
hrtime_t vstart = gethrvtime ();
/* Log the event */
wlog ("start of fitos", NULL);
if (n <= 0)
n = 1;
int max = N * n;
long long count = 0;
do
{
for (current_random = 1, i = retv = k = 0; i < max; i++)
{
retv += my_irand (100);
k += (current_random & (IM - 1)) >= (1 << 22);
}
count++;
}
while (start + testtime * 1e9 > gethrtime ());
fprintf (stderr, "\t\t%d out of a total of %d >= 2^22 (%d)\n", k, max, retv);
fprintf (stderr, " Performed %lld while-loop iterations\n", count);
whrvlog ((gethrtime () - start), (gethrvtime () - vstart), "fitos", NULL);
return 0;
}
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