source: mainline/test/fpu/fpu1/test.c@ f275cb3

/*
 * Copyright (C) 2005 Jakub Vana
 * Copyright (C) 2005 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <print.h>
#include <debug.h>
#include <panic.h>

#include <test.h>
#include <arch/atomic.h>
#include <proc/thread.h>

#include <arch.h>

#define THREADS         150*2
#define ATTEMPTS        100

#define E_10e8  271828182
#define PI_10e8 314159265

static inline double sqrt(double x) { double v; __asm__ ("fsqrt\n" : "=t" (v) : "0" (x)); return v; }

static atomic_t threads_ok;
static waitq_t can_start;

static void e(void *data)
{
        int i;
        double e,d,le,f;

        waitq_sleep(&can_start);

        for (i = 0; i<ATTEMPTS; i++) {
                le=-1;
                e=0;
                f=1;

                for(d=1;e!=le;d*=f,f+=1) {
                        le=e;
                        e=e+1/d;
                }

                if((int)(100000000*e)!=E_10e8)
                        panic("tid%d: e*10e8=%d\n", THREAD->tid, (int) 100000000*e);
        }

        atomic_inc(&threads_ok);
}

static void pi(void *data)
{
        int i;
        double lpi, pi;
        double n, ab, ad;

        waitq_sleep(&can_start);


        for (i = 0; i<ATTEMPTS; i++) {
                lpi = -1;
                pi = 0;

                for (n=2, ab = sqrt(2); lpi != pi; n *= 2, ab = ad) {
                        double sc, cd;

                        sc = sqrt(1 - (ab*ab/4));
                        cd = 1 - sc;
                        ad = sqrt(ab*ab/4 + cd*cd);
                        lpi = pi;
                        pi = 2 * n * ad;
                }

                if((int)(100000000*pi)!=PI_10e8)
                        panic("tid%d: pi*10e8=%d\n", THREAD->tid, (int) 100000000*pi);
        }

        atomic_inc(&threads_ok);
}


void test(void)
{
        thread_t *t;
        int i;

        waitq_initialize(&can_start);

        printf("FPU test #1\n");
        printf("Creating %d threads... ", THREADS);

        for (i=0; i<THREADS/2; i++) {  
                if (!(t = thread_create(e, NULL, TASK, 0)))
                        panic("could not create thread\n");
                thread_ready(t);
                if (!(t = thread_create(pi, NULL, TASK, 0)))
                        panic("could not create thread\n");
                thread_ready(t);
        }
        printf("ok\n");
        
        thread_sleep(1);
        waitq_wakeup(&can_start, WAKEUP_ALL);

        while (threads_ok != THREADS)
                ;
                
        printf("Test passed.\n");
}