ports/sysdeps/ia64/fpu/printf_fphex.c

   1 /* Print floating point number in hexadecimal notation according to ISO C99.
   2    Copyright (C) 2000, 2005 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef LONG_DOUBLE_DENORM_BIAS
  20 # define LONG_DOUBLE_DENORM_BIAS (IEEE854_LONG_DOUBLE_BIAS - 1)
  21 #endif
  22
  23 #define PRINT_FPHEX_LONG_DOUBLE \
  24 do {                                                                          \
  25       /* The "strange" 80 bit format on ia64 has an explicit                  \
  26          leading digit in the 64 bit mantissa.  */                            \
  27       unsigned long long int num;                                             \
  28                                                                               \
  29       num = (((unsigned long long int) fpnum.ldbl.ieee.mantissa0) << 32       \
  30              | fpnum.ldbl.ieee.mantissa1);                                    \
  31                                                                               \
  32       zero_mantissa = num == 0;                                               \
  33                                                                               \
  34       numstr = _itoa_word (num, numbuf + sizeof numbuf, 16,                   \
  35                            info->spec == 'A');                                \
  36       wnumstr = _itowa_word (num,                                             \
  37                              wnumbuf + sizeof (wnumbuf) / sizeof (wchar_t),   \
  38                              16, info->spec == 'A');                          \
  39                                                                               \
  40       /* Fill with zeroes.  */                                                \
  41       while (numstr > numbuf + (sizeof numbuf - 64 / 4))                      \
  42         {                                                                     \
  43           *--numstr = '0';                                                    \
  44           *--wnumstr = L'0';                                                  \
  45         }                                                                     \
  46                                                                               \
  47       /* We use a full nibble for the leading digit.  */                      \
  48       leading = *numstr++;                                                    \
  49                                                                               \
  50       /* We have 3 bits from the mantissa in the leading nibble.              \
  51          Therefore we are here using `IEEE854_LONG_DOUBLE_BIAS + 3'.  */      \
  52       exponent = fpnum.ldbl.ieee.exponent;                                    \
  53                                                                              \
  54       if (exponent == 0)                                                      \
  55         {                                                                     \
  56           if (zero_mantissa)                                                  \
  57             expnegative = 0;                                                  \
  58           else                                                                \
  59             {                                                                 \
  60               /* This is a denormalized number.  */                           \
  61               expnegative = 1;                                                \
  62               /* This is a hook for the m68k long double format, where the    \
  63                  exponent bias is the same for normalized and denormalized    \
  64                  numbers.  */                                                 \
  65               exponent = LONG_DOUBLE_DENORM_BIAS + 3;                         \
  66             }                                                                 \
  67         }                                                                     \
  68       else if (exponent >= IEEE854_LONG_DOUBLE_BIAS + 3)                      \
  69         {                                                                     \
  70           expnegative = 0;                                                    \
  71           exponent -= IEEE854_LONG_DOUBLE_BIAS + 3;                           \
  72         }                                                                     \
  73       else                                                                    \
  74         {                                                                     \
  75           expnegative = 1;                                                    \
  76           exponent = -(exponent - (IEEE854_LONG_DOUBLE_BIAS + 3));            \
  77         }                                                                     \
  78 } while (0)
  79
  80 #include <stdio-common/printf_fphex.c>