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/* dsp_check2.c - check dsp algorithms. */
/* asserv - Position & speed motor control on a ATmega128. {{{
 *
 * Copyright (C) 2004 Nicolas Schodet
 *
 * Robot APB Team/Efrei 2005.
 *        Web: http://assos.efrei.fr/robot/
 *      Email: robot AT efrei DOT fr
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 * }}} */
#include <stdio.h>
#include <math.h>

/* +AutoDec */
/* -AutoDec */

static int failled = 0;

void
check_mul_f824 (int a, int b, int r)
{
    long long m = ((long long) a * b) >> 24;
    if (m > (1LL << 31) - 1 || m < -(1LL << 31))
	printf ("overflow %d * %d = %d (%Ld)", a, b, r, m);
    else if (m == r)
	printf ("pass %d * %d = %d", a, b, r);
    else
      {
	printf ("fail %d * %d = %d (%Ld)", a, b, r, m);
	failled = 1;
      }
    printf (" | %08x %08x %08x\n", a, b, r);
}

void
check_div_f824 (int d, int v, int r)
{
    long long m;
    if (v == 0)
      {
	printf ("zero div %d / %d", d, v);
      }
    else
      {
	m = (((long long) d) << 24) / v;
	if (m > (1LL << 31) - 1 || m < -(1LL << 31))
	    printf ("overflow %d / %d = %d (%Ld)", d, v, r, m);
	else if (m == r)
	    printf ("pass %d / %d = %d", d, v, r);
	else
	  {
	    printf ("fail %d / %d = %d (%Ld)", d, v, r, m);
	    failled = 1;
	  }
      }
    printf (" | %08x %08x %08x\n", d, v, r);
}

void
check_sqrt (unsigned int s, unsigned int r)
{
    double ds = (double) s / (1 << 8);
    unsigned int m = sqrt (ds) * (1 << 8);
    m &= ~0xf;
    if (m == r)
	printf ("pass sqrt (%u) = %u", s, r);
    else
      {
	printf ("fail sqrt (%u) = %u (%u)", s, r, m);
	failled = 1;
      }
    printf (" | %08x %08x %08x\n", s, r, m);
}

int
peek (void)
{
    int ret;
    char cs;
    ret = scanf (" %c", &cs);
    if (ret != 1) return 0;
    ungetc (cs, stdin);
    return cs;
}

int
get (int c, int *v)
{
    int ret;
    char cs;
    ret = scanf (" %c", &cs);
    if (ret != 1 || cs != c)
	return 0;
    ret = scanf (" %d", v);
    return ret == 1;
}

int
main (void)
{
    int incomplete = 0;
    int a, b, r1, r2, r3, r4, c;
    while (!feof (stdin))
      {
	c = peek ();
	if (c == 'A')
	  {
	    if (get ('A', &a) && get ('B', &b) && get ('r', &r1) && get ('r', &r2)
		&& get ('r', &r3) && get ('r', &r4))
	      {
		check_mul_f824 (a, b, r1);
		check_mul_f824 (-a, b, r2);
		check_mul_f824 (a, -b, r3);
		check_mul_f824 (-a, -b, r4);
	      }
	    else if (!feof (stdin))
		incomplete++;
	  }
	else if (c == 'd')
	  {
	    if (get ('d', &a) && get ('v', &b) && get ('r', &r1) && get ('r', &r2)
		&& get ('r', &r3) && get ('r', &r4))
	      {
		check_div_f824 (a, b, r1);
		check_div_f824 (-a, b, r1);
		check_div_f824 (a, -b, r1);
		check_div_f824 (-a, -b, r1);
	      }
	    else if (!feof (stdin))
		incomplete++;
	  }
	else if (c == 's')
	  {
	    if (get ('s', &a) && get ('r', &r1))
	      {
		check_sqrt (a, r1);
	      }
	    else if (!feof (stdin))
		incomplete++;
	  }
	else if (c == 0)
	    ;
	else
	    printf ("unexpected character '%c'\n", c);
      }
    if (incomplete)
	printf ("%d incomplete tests\n", incomplete);
    if (failled)
      {
	printf ("test failled\n");
	return 1;
      }
    else
      {
	printf ("test passed\n");
	return 0;
      }
}