source: mainline/kernel/test/fpu/fpu1_x86.c@ c39544a

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

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


#define THREADS   150
#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 atomic_t threads_fault;
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) {
                        TPRINTF("tid%" PRIu64 ": e*10e8=%" PRIun " should be %" PRIun "\n",
                            THREAD->tid, (unative_t) (100000000 * e), (unative_t) E_10e8);
                        atomic_inc(&threads_fault);
                        break;
                }
        }
        atomic_inc(&threads_ok);
}

static void pi(void *data)
{
        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;
                }
                
                if ((int) (100000000 * pi) != PI_10e8) {
                        TPRINTF("tid%" PRIu64 ": pi*10e8=%" PRIun " should be %" PRIun "\n",
                            THREAD->tid, (unative_t) (100000000 * pi), (unative_t) PI_10e8);
                        atomic_inc(&threads_fault);
                        break;
                }
        }
        atomic_inc(&threads_ok);
}

const char *test_fpu1(void)
{
        unsigned int i;
        atomic_count_t total = 0;
        
        waitq_initialize(&can_start);
        atomic_set(&threads_ok, 0);
        atomic_set(&threads_fault, 0);
        
        TPRINTF("Creating %u threads... ", 2 * THREADS);
        
        for (i = 0; i < THREADS; i++) {
                thread_t *t;
                
                if (!(t = thread_create(e, NULL, TASK, 0, "e", false))) {
                        TPRINTF("could not create thread %u\n", 2 * i);
                        break;
                }
                thread_ready(t);
                total++;
                
                if (!(t = thread_create(pi, NULL, TASK, 0, "pi", false))) {
                        TPRINTF("could not create thread %u\n", 2 * i + 1);
                        break;
                }
                thread_ready(t);
                total++;
        }
        
        TPRINTF("ok\n");
        
        thread_sleep(1);
        waitq_wakeup(&can_start, WAKEUP_ALL);
        
        while (atomic_get(&threads_ok) != total) {
                TPRINTF("Threads left: %" PRIua "\n", total - atomic_get(&threads_ok));
                thread_sleep(1);
        }
        
        if (atomic_get(&threads_fault) == 0)
                return NULL;
        
        return "Test failed";
}