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/*
 * 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 <atomic.h>
#include <proc/thread.h>

#include <arch.h>
#include <arch/arch.h>

#define THREADS     150*2
#define ATTEMPTS    100

#define E_10e8  271828182
#define PI_10e8 314159265


#ifdef __ia32_ARCH_H__
static inline double sqrt(double x) { double v; __asm__ ("fsqrt\n" : "=t" (v) : "0" (x)); return v; }
#endif

#ifdef __amd64_ARCH_H__
static inline double sqrt(double x) { double v; __asm__ ("fsqrt\n" : "=t" (v) : "0" (x)); return v; }
#endif

#ifdef __ia64_ARCH_H__
static inline long double sqrt(long double a) 
{   
    long double x = 1;
    long double lx = 0;

    if(a<0.00000000000000001) return 0;
        
    while(x!=lx)
    {
        lx=x;
        x=(x+(a/x))/2;
    }
    return x; 
}
#endif



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 should be %d\n", THREAD->tid, (__native) (100000000*e),(__native) E_10e8);
    }

    printf("tid%d: e*10e8=%d should be %d\n", THREAD->tid, (__native) (100000000*e),(__native) E_10e8);
    atomic_inc(&threads_ok);
}

static void pi(void *data)
{

#ifdef __ia64_ARCH_H__
#undef PI_10e8  
#define PI_10e8 3141592
#endif

    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;
        }

#ifdef __ia64_ARCH_H__
        if((int)(1000000*pi)!=PI_10e8)
            panic("tid%d: pi*10e8=%d should be %d\n", THREAD->tid, (__native) (1000000*pi),(__native) (PI_10e8/100));
#else
        if((int)(100000000*pi)!=PI_10e8)
            panic("tid%d: pi*10e8=%d should be %d\n", THREAD->tid, (__native) (100000000*pi),(__native) PI_10e8);
#endif

    }

    printf("tid%d: pi*10e8=%d should be %d\n", THREAD->tid, (__native) (100000000*pi),(__native) PI_10e8);
    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, "e")))
            panic("could not create thread\n");
        thread_ready(t);
        if (!(t = thread_create(pi, NULL, TASK, 0, "pi")))
            panic("could not create thread\n");
        thread_ready(t);
    }
    printf("ok\n");
    
    thread_sleep(1);
    waitq_wakeup(&can_start, WAKEUP_ALL);

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