ieee754d.c

Go to the documentation of this file.

/*
 * Some debug functions
 *
 * MIPS floating point support
 *
 * Copyright (C) 1994-2000 Algorithmics Ltd.
 *
 *  This program is free software; you can distribute it and/or modify it
 *  under the terms of the GNU General Public License (Version 2) as
 *  published by the Free Software Foundation.
 *
 *  This program is distributed in the hope 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.
 *
 *  Nov 7, 2000
 *  Modified to build and operate in Linux kernel environment.
 *
 *  Kevin D. Kissell, [email protected] and Carsten Langgaard, [email protected]
 *  Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved.
 */

#include <linux/kernel.h>
#include "ieee754.h"

#define DP_EBIAS    1023
#define DP_EMIN     (-1022)
#define DP_EMAX     1023
#define DP_FBITS    52

#define SP_EBIAS    127
#define SP_EMIN     (-126)
#define SP_EMAX     127
#define SP_FBITS    23

#define DP_MBIT(x)  ((u64)1 << (x))
#define DP_HIDDEN_BIT   DP_MBIT(DP_FBITS)
#define DP_SIGN_BIT DP_MBIT(63)


#define SP_MBIT(x)  ((u32)1 << (x))
#define SP_HIDDEN_BIT   SP_MBIT(SP_FBITS)
#define SP_SIGN_BIT SP_MBIT(31)


#define SPSIGN(sp)  (sp.parts.sign)
#define SPBEXP(sp)  (sp.parts.bexp)
#define SPMANT(sp)  (sp.parts.mant)

#define DPSIGN(dp)  (dp.parts.sign)
#define DPBEXP(dp)  (dp.parts.bexp)
#define DPMANT(dp)  (dp.parts.mant)

ieee754dp ieee754dp_dump(char *m, ieee754dp x)
{
    int i;

    printk("%s", m);
    printk("<%08x,%08x>\n", (unsigned) (x.bits >> 32),
           (unsigned) x.bits);
    printk("\t=");
    switch (ieee754dp_class(x)) {
    case IEEE754_CLASS_QNAN:
    case IEEE754_CLASS_SNAN:
        printk("Nan %c", DPSIGN(x) ? '-' : '+');
        for (i = DP_FBITS - 1; i >= 0; i--)
            printk("%c", DPMANT(x) & DP_MBIT(i) ? '1' : '0');
        break;
    case IEEE754_CLASS_INF:
        printk("%cInfinity", DPSIGN(x) ? '-' : '+');
        break;
    case IEEE754_CLASS_ZERO:
        printk("%cZero", DPSIGN(x) ? '-' : '+');
        break;
    case IEEE754_CLASS_DNORM:
        printk("%c0.", DPSIGN(x) ? '-' : '+');
        for (i = DP_FBITS - 1; i >= 0; i--)
            printk("%c", DPMANT(x) & DP_MBIT(i) ? '1' : '0');
        printk("e%d", DPBEXP(x) - DP_EBIAS);
        break;
    case IEEE754_CLASS_NORM:
        printk("%c1.", DPSIGN(x) ? '-' : '+');
        for (i = DP_FBITS - 1; i >= 0; i--)
            printk("%c", DPMANT(x) & DP_MBIT(i) ? '1' : '0');
        printk("e%d", DPBEXP(x) - DP_EBIAS);
        break;
    default:
        printk("Illegal/Unknown IEEE754 value class");
    }
    printk("\n");
    return x;
}

ieee754sp ieee754sp_dump(char *m, ieee754sp x)
{
    int i;

    printk("%s=", m);
    printk("<%08x>\n", (unsigned) x.bits);
    printk("\t=");
    switch (ieee754sp_class(x)) {
    case IEEE754_CLASS_QNAN:
    case IEEE754_CLASS_SNAN:
        printk("Nan %c", SPSIGN(x) ? '-' : '+');
        for (i = SP_FBITS - 1; i >= 0; i--)
            printk("%c", SPMANT(x) & SP_MBIT(i) ? '1' : '0');
        break;
    case IEEE754_CLASS_INF:
        printk("%cInfinity", SPSIGN(x) ? '-' : '+');
        break;
    case IEEE754_CLASS_ZERO:
        printk("%cZero", SPSIGN(x) ? '-' : '+');
        break;
    case IEEE754_CLASS_DNORM:
        printk("%c0.", SPSIGN(x) ? '-' : '+');
        for (i = SP_FBITS - 1; i >= 0; i--)
            printk("%c", SPMANT(x) & SP_MBIT(i) ? '1' : '0');
        printk("e%d", SPBEXP(x) - SP_EBIAS);
        break;
    case IEEE754_CLASS_NORM:
        printk("%c1.", SPSIGN(x) ? '-' : '+');
        for (i = SP_FBITS - 1; i >= 0; i--)
            printk("%c", SPMANT(x) & SP_MBIT(i) ? '1' : '0');
        printk("e%d", SPBEXP(x) - SP_EBIAS);
        break;
    default:
        printk("Illegal/Unknown IEEE754 value class");
    }
    printk("\n");
    return x;
}