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Annotation of GNUtools/libg++/include/ieee-float.h, revision 1.1.1.1

1.1       root        1: /* IEEE floating point support declarations, for GDB, the GNU Debugger.
                      2:    Copyright (C) 1991 Free Software Foundation, Inc.
                      3: 
                      4: This file is part of GDB.
                      5: 
                      6: This program is free software; you can redistribute it and/or modify
                      7: it under the terms of the GNU General Public License as published by
                      8: the Free Software Foundation; either version 2 of the License, or
                      9: (at your option) any later version.
                     10: 
                     11: This program is distributed in the hope that it will be useful,
                     12: but WITHOUT ANY WARRANTY; without even the implied warranty of
                     13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
                     14: GNU General Public License for more details.
                     15: 
                     16: You should have received a copy of the GNU General Public License
                     17: along with this program; if not, write to the Free Software
                     18: Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
                     19: 
                     20: #if !defined (IEEE_FLOAT_H)
                     21: #define IEEE_FLOAT_H 1
                     22: 
                     23: #include "ansidecl.h"
                     24: 
                     25: /* Parameters for extended float format:  */
                     26: 
                     27: struct ext_format {
                     28:   unsigned totalsize;          /* Total size of extended number */
                     29:   unsigned signbyte;           /* Byte number of sign bit */
                     30:   unsigned char signmask;      /* Mask for sign bit */
                     31:   unsigned expbyte_h;          /* High byte of exponent */
                     32:   unsigned expbyte_l;          /* Low  byte of exponent */
                     33:   unsigned manbyte_h;          /* High byte of mantissa */
                     34:   unsigned manbyte_l;          /* Low  byte of mantissa */
                     35: };
                     36: 
                     37: #define        TOTALSIZE       ext_format->totalsize
                     38: #define        SIGNBYTE        ext_format->signbyte
                     39: #define        SIGNMASK        ext_format->signmask
                     40: #define EXPBYTE_H      ext_format->expbyte_h
                     41: #define EXPBYTE_L      ext_format->expbyte_l
                     42: #define        MANBYTE_H       ext_format->manbyte_h
                     43: #define        MANBYTE_L       ext_format->manbyte_l
                     44: 
                     45: /* Actual ext_format structs for various machines are in the *-tdep.c file
                     46:    for each machine.  */
                     47: 
                     48: #define        EXT_EXP_NAN     0x7FFF  /* Exponent value that indicates NaN */
                     49: #define        EXT_EXP_BIAS    0x3FFF  /* Amount added to "true" exponent for ext */
                     50: #define        DBL_EXP_BIAS     0x3FF  /* Ditto, for doubles */
                     51: 
                     52: /* Convert an IEEE extended float to a double.
                     53:    FROM is the address of the extended float.
                     54:    Store the double in *TO.  */
                     55: 
                     56: extern void
                     57: ieee_extended_to_double PARAMS ((const struct ext_format *, char *, double *));
                     58: 
                     59: /* The converse: convert the double *FROM to an extended float
                     60:    and store where TO points.  */
                     61: 
                     62: extern void
                     63: double_to_ieee_extended PARAMS ((const struct ext_format *, double *, char *));
                     64: 
                     65: #endif /* defined (IEEE_FLOAT_H) */

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