main.c
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/*
* Copyright (C) 2014 René Kijewski <rene.kijewski@fu-berlin.de>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @ingroup tests
* @{
*
* @file
* @brief Measure the speed of the function in bitarithm.c
*
* @author René Kijewski <rene.kijewski@fu-berlin.de>
*
* @}
*/
#include <stdio.h>
#include "bitarithm.h"
#include "xtimer.h"
#define TIMEOUT_S (5ul)
#define TIMEOUT (TIMEOUT_S * SEC_IN_USEC)
#define PER_ITERATION (4)
static void callback(void *done_)
{
volatile int *done = done_;
*done = 1;
}
static void run_test(const char *name, unsigned (*test)(unsigned))
{
volatile int done = 0;
unsigned i = 0;
unsigned long count = 0;
xtimer_t xtimer;
xtimer.callback = callback;
xtimer.arg = (void *) &done;
xtimer_set(&xtimer, TIMEOUT);
do {
if (i++ == -1u) {
i = 1;
}
for (unsigned j = 0; j < PER_ITERATION; ++j) {
volatile unsigned r;
r = test(i);
(void) r;
r = test(-1u - i);
(void) r;
r = test(~i);
(void) r;
r = test(~(-1u - i));
(void) r;
}
++count;
} while (done == 0);
printf("+ %s: %lu iterations per second\r\n", name, (4*PER_ITERATION) * count / TIMEOUT_S);
}
#define run_test(test) run_test(#test, test)
int main(void)
{
printf("Start.\r\n");
run_test(bitarithm_msb);
run_test(bitarithm_lsb);
run_test(bitarithm_bits_set);
printf("Done.\r\n");
return 0;
}