source: mainline/kernel/test/fpu/fpu1.c@ dff0a94

/*
 * 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>

#ifdef CONFIG_BENCH
#include <arch/cycle.h>
#endif

#if (defined(ia32) || defined(amd64) || defined(ia64) || defined(ia32xen))

#define THREADS         150*2
#define ATTEMPTS        100

#define E_10e8  271828182
#define PI_10e8 314159265


#ifdef KERN_ia32_ARCH_H_
static inline double sqrt(double x) { double v; __asm__ ("fsqrt\n" : "=t" (v) : "0" (x)); return v; }
#endif

#ifdef KERN_amd64_ARCH_H_
static inline double sqrt(double x) { double v; __asm__ ("fsqrt\n" : "=t" (v) : "0" (x)); return v; }
#endif

#ifdef KERN_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;

        thread_detach(THREAD);

        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=%zd should be %zd\n", THREAD->tid, (unative_t) (100000000*e),(unative_t) E_10e8);
        }

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

static void pi(void *data)
{

#ifdef KERN_ia64_ARCH_H_
#undef PI_10e8  
#define PI_10e8 3141592
#endif


        int i;
        double lpi, pi;
        double n, ab, ad;
        
        thread_detach(THREAD);

        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 KERN_ia64_ARCH_H_
                if((int)(1000000*pi)!=PI_10e8)
                        panic("tid%d: pi*10e8=%zd should be %zd\n", THREAD->tid, (unative_t) (1000000*pi),(unative_t) (PI_10e8/100));
#else
                if((int)(100000000*pi)!=PI_10e8)
                        panic("tid%d: pi*10e8=%zd should be %zd\n", THREAD->tid, (unative_t) (100000000*pi),(unative_t) PI_10e8);
#endif

        }

        printf("tid%d: pi*10e8=%zd should be %zd\n", THREAD->tid, (unative_t) (100000000*pi),(unative_t) PI_10e8);
        atomic_inc(&threads_ok);
}

void test_fpu1(void)
{
#ifdef CONFIG_BENCH
        uint64_t t0 = get_cycle();
#endif
        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");
#ifdef CONFIG_BENCH
        uint64_t dt = get_cycle() - t0;
        printf("Time: %.*d cycles\n", sizeof(dt) * 2, dt);
#endif
}

#else

void test_fpu1(void)
{
        printf("This test is available only on Intel/AMD platforms.");
}

#endif