arch/mips/math-emu/ieee754d.c

   1 /*
   2  * Some debug functions
   3  *
   4  * MIPS floating point support
   5  *
   6  * Copyright (C) 1994-2000 Algorithmics Ltd.
   7  * http://www.algor.co.uk
   8  *
   9  *  This program is free software; you can distribute it and/or modify it
  10  *  under the terms of the GNU General Public License (Version 2) as
  11  *  published by the Free Software Foundation.
  12  *
  13  *  This program is distributed in the hope it will be useful, but WITHOUT
  14  *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16  *  for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License along
  19  *  with this program; if not, write to the Free Software Foundation, Inc.,
  20  *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
  21  *
  22  *  Nov 7, 2000
  23  *  Modified to build and operate in Linux kernel environment.
  24  *
  25  *  Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
  26  *  Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved.
  27  */
  28
  29 #include <linux/kernel.h>
  30 #include "ieee754.h"
  31
  32 #define DP_EBIAS        1023
  33 #define DP_EMIN         (-1022)
  34 #define DP_EMAX         1023
  35 #define DP_FBITS        52
  36
  37 #define SP_EBIAS        127
  38 #define SP_EMIN         (-126)
  39 #define SP_EMAX         127
  40 #define SP_FBITS        23
  41
  42 #define DP_MBIT(x)      ((u64)1 << (x))
  43 #define DP_HIDDEN_BIT   DP_MBIT(DP_FBITS)
  44 #define DP_SIGN_BIT     DP_MBIT(63)
  45
  46
  47 #define SP_MBIT(x)      ((u32)1 << (x))
  48 #define SP_HIDDEN_BIT   SP_MBIT(SP_FBITS)
  49 #define SP_SIGN_BIT     SP_MBIT(31)
  50
  51
  52 #define SPSIGN(sp)      (sp.parts.sign)
  53 #define SPBEXP(sp)      (sp.parts.bexp)
  54 #define SPMANT(sp)      (sp.parts.mant)
  55
  56 #define DPSIGN(dp)      (dp.parts.sign)
  57 #define DPBEXP(dp)      (dp.parts.bexp)
  58 #define DPMANT(dp)      (dp.parts.mant)
  59
  60 ieee754dp ieee754dp_dump(char *m, ieee754dp x)
  61 {
  62         int i;
  63
  64         printk("%s", m);
  65         printk("<%08x,%08x>\n", (unsigned) (x.bits >> 32),
  66                (unsigned) x.bits);
  67         printk("\t=");
  68         switch (ieee754dp_class(x)) {
  69         case IEEE754_CLASS_QNAN:
  70         case IEEE754_CLASS_SNAN:
  71                 printk("Nan %c", DPSIGN(x) ? '-' : '+');
  72                 for (i = DP_FBITS - 1; i >= 0; i--)
  73                         printk("%c", DPMANT(x) & DP_MBIT(i) ? '1' : '0');
  74                 break;
  75         case IEEE754_CLASS_INF:
  76                 printk("%cInfinity", DPSIGN(x) ? '-' : '+');
  77                 break;
  78         case IEEE754_CLASS_ZERO:
  79                 printk("%cZero", DPSIGN(x) ? '-' : '+');
  80                 break;
  81         case IEEE754_CLASS_DNORM:
  82                 printk("%c0.", DPSIGN(x) ? '-' : '+');
  83                 for (i = DP_FBITS - 1; i >= 0; i--)
  84                         printk("%c", DPMANT(x) & DP_MBIT(i) ? '1' : '0');
  85                 printk("e%d", DPBEXP(x) - DP_EBIAS);
  86                 break;
  87         case IEEE754_CLASS_NORM:
  88                 printk("%c1.", DPSIGN(x) ? '-' : '+');
  89                 for (i = DP_FBITS - 1; i >= 0; i--)
  90                         printk("%c", DPMANT(x) & DP_MBIT(i) ? '1' : '0');
  91                 printk("e%d", DPBEXP(x) - DP_EBIAS);
  92                 break;
  93         default:
  94                 printk("Illegal/Unknown IEEE754 value class");
  95         }
  96         printk("\n");
  97         return x;
  98 }
  99
 100 ieee754sp ieee754sp_dump(char *m, ieee754sp x)
 101 {
 102         int i;
 103
 104         printk("%s=", m);
 105         printk("<%08x>\n", (unsigned) x.bits);
 106         printk("\t=");
 107         switch (ieee754sp_class(x)) {
 108         case IEEE754_CLASS_QNAN:
 109         case IEEE754_CLASS_SNAN:
 110                 printk("Nan %c", SPSIGN(x) ? '-' : '+');
 111                 for (i = SP_FBITS - 1; i >= 0; i--)
 112                         printk("%c", SPMANT(x) & SP_MBIT(i) ? '1' : '0');
 113                 break;
 114         case IEEE754_CLASS_INF:
 115                 printk("%cInfinity", SPSIGN(x) ? '-' : '+');
 116                 break;
 117         case IEEE754_CLASS_ZERO:
 118                 printk("%cZero", SPSIGN(x) ? '-' : '+');
 119                 break;
 120         case IEEE754_CLASS_DNORM:
 121                 printk("%c0.", SPSIGN(x) ? '-' : '+');
 122                 for (i = SP_FBITS - 1; i >= 0; i--)
 123                         printk("%c", SPMANT(x) & SP_MBIT(i) ? '1' : '0');
 124                 printk("e%d", SPBEXP(x) - SP_EBIAS);
 125                 break;
 126         case IEEE754_CLASS_NORM:
 127                 printk("%c1.", SPSIGN(x) ? '-' : '+');
 128                 for (i = SP_FBITS - 1; i >= 0; i--)
 129                         printk("%c", SPMANT(x) & SP_MBIT(i) ? '1' : '0');
 130                 printk("e%d", SPBEXP(x) - SP_EBIAS);
 131                 break;
 132         default:
 133                 printk("Illegal/Unknown IEEE754 value class");
 134         }
 135         printk("\n");
 136         return x;
 137 }
 138