ports/sysdeps/ia64/fpu/printf_fphex.c

   1 /* Print floating point number in hexadecimal notation according to ISO C99.
   2    Copyright (C) 2000-2014 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       union ieee854_long_double u;                                            \
  29       u.d = fpnum.ldbl;                                                       \
  30                                                                               \
  31       num = (((unsigned long long int) u.ieee.mantissa0) << 32                \
  32              | u.ieee.mantissa1);                                             \
  33                                                                               \
  34       zero_mantissa = num == 0;                                               \
  35                                                                               \
  36       numstr = _itoa_word (num, numbuf + sizeof numbuf, 16,                   \
  37                            info->spec == 'A');                                \
  38       wnumstr = _itowa_word (num,                                             \
  39                              wnumbuf + sizeof (wnumbuf) / sizeof (wchar_t),   \
  40                              16, info->spec == 'A');                          \
  41                                                                               \
  42       /* Fill with zeroes.  */                                                \
  43       while (numstr > numbuf + (sizeof numbuf - 64 / 4))                      \
  44         {                                                                     \
  45           *--numstr = '0';                                                    \
  46           *--wnumstr = L'0';                                                  \
  47         }                                                                     \
  48                                                                               \
  49       /* We use a full nibble for the leading digit.  */                      \
  50       leading = *numstr++;                                                    \
  51                                                                               \
  52       /* We have 3 bits from the mantissa in the leading nibble.              \
  53          Therefore we are here using `IEEE854_LONG_DOUBLE_BIAS + 3'.  */      \
  54       exponent = u.ieee.exponent;                                             \
  55                                                                               \
  56       if (exponent == 0)                                                      \
  57         {                                                                     \
  58           if (zero_mantissa)                                                  \
  59             expnegative = 0;                                                  \
  60           else                                                                \
  61             {                                                                 \
  62               /* This is a denormalized number.  */                           \
  63               expnegative = 1;                                                \
  64               /* This is a hook for the m68k long double format, where the    \
  65                  exponent bias is the same for normalized and denormalized    \
  66                  numbers.  */                                                 \
  67               exponent = LONG_DOUBLE_DENORM_BIAS + 3;                         \
  68             }                                                                 \
  69         }                                                                     \
  70       else if (exponent >= IEEE854_LONG_DOUBLE_BIAS + 3)                      \
  71         {                                                                     \
  72           expnegative = 0;                                                    \
  73           exponent -= IEEE854_LONG_DOUBLE_BIAS + 3;                           \
  74         }                                                                     \
  75       else                                                                    \
  76         {                                                                     \
  77           expnegative = 1;                                                    \
  78           exponent = -(exponent - (IEEE854_LONG_DOUBLE_BIAS + 3));            \
  79         }                                                                     \
  80 } while (0)
  81
  82 #include <stdio-common/printf_fphex.c>