diff options
Diffstat (limited to 'sysdeps/ieee754/ldbl-128ibm/printf_fphex.c')
| -rw-r--r-- | sysdeps/ieee754/ldbl-128ibm/printf_fphex.c | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/sysdeps/ieee754/ldbl-128ibm/printf_fphex.c b/sysdeps/ieee754/ldbl-128ibm/printf_fphex.c new file mode 100644 index 0000000..2a7b70f --- /dev/null +++ b/sysdeps/ieee754/ldbl-128ibm/printf_fphex.c @@ -0,0 +1,138 @@ +/* Print floating point number in hexadecimal notation according to ISO C99. + Copyright (C) 1997,1998,1999,2000,2001,2002,2004,2006 + Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#define PRINT_FPHEX_LONG_DOUBLE \ +do { \ + /* We have 105 bits of mantissa plus one implicit digit. Since \ + 106 bits are representable without rest using hexadecimal \ + digits we use only the implicit digits for the number before \ + the decimal point. */ \ + unsigned long long int num0, num1; \ + unsigned long long hi, lo; \ + int ediff; \ + union ibm_extended_long_double eldbl; \ + eldbl.d = fpnum.ldbl.d; \ + \ + assert (sizeof (long double) == 16); \ + \ + lo = ((long long)eldbl.ieee.mantissa2 << 32) | eldbl.ieee.mantissa3; \ + hi = ((long long)eldbl.ieee.mantissa0 << 32) | eldbl.ieee.mantissa1; \ + /* If the lower double is not a denomal or zero then set the hidden \ + 53rd bit. */ \ + if (eldbl.ieee.exponent2 > 0x001) \ + { \ + lo |= (1ULL << 52); \ + lo = lo << 7; /* pre-shift lo to match ieee854. */ \ + /* The lower double is normalized separately from the upper. We \ + may need to adjust the lower manitissa to reflect this. */ \ + ediff = eldbl.ieee.exponent - eldbl.ieee.exponent2; \ + if (ediff > 53) \ + lo = lo >> (ediff-53); \ + } \ + \ + if ((eldbl.ieee.negative != eldbl.ieee.negative2) \ + && ((eldbl.ieee.exponent2 != 0) && (lo != 0L))) \ + { \ + lo = (1ULL << 60) - lo; \ + if (hi == 0L) \ + { \ + /* we have a borrow from the hidden bit, so shift left 1. */ \ + hi = 0xffffffffffffeLL | (lo >> 59); \ + lo = 0xfffffffffffffffLL & (lo << 1); \ + eldbl.ieee.exponent--; \ + } \ + else \ + hi--; \ + } \ + num1 = (hi << 60) | lo; \ + num0 = hi >> 4; \ + \ + zero_mantissa = (num0|num1) == 0; \ + \ + if (sizeof (unsigned long int) > 6) \ + { \ + numstr = _itoa_word (num1, numbuf + sizeof numbuf, 16, \ + info->spec == 'A'); \ + wnumstr = _itowa_word (num1, \ + wnumbuf + sizeof (wnumbuf) / sizeof (wchar_t),\ + 16, info->spec == 'A'); \ + } \ + else \ + { \ + numstr = _itoa (num1, numbuf + sizeof numbuf, 16, \ + info->spec == 'A'); \ + wnumstr = _itowa (num1, \ + wnumbuf + sizeof (wnumbuf) / sizeof (wchar_t), \ + 16, info->spec == 'A'); \ + } \ + \ + while (numstr > numbuf + (sizeof numbuf - 64 / 4)) \ + { \ + *--numstr = '0'; \ + *--wnumstr = L'0'; \ + } \ + \ + if (sizeof (unsigned long int) > 6) \ + { \ + numstr = _itoa_word (num0, numstr, 16, info->spec == 'A'); \ + wnumstr = _itowa_word (num0, wnumstr, 16, info->spec == 'A'); \ + } \ + else \ + { \ + numstr = _itoa (num0, numstr, 16, info->spec == 'A'); \ + wnumstr = _itowa (num0, wnumstr, 16, info->spec == 'A'); \ + } \ + \ + /* Fill with zeroes. */ \ + while (numstr > numbuf + (sizeof numbuf - 112 / 4)) \ + { \ + *--numstr = '0'; \ + *--wnumstr = L'0'; \ + } \ + \ + leading = eldbl.ieee.exponent == 0 ? '0' : '1'; \ + \ + exponent = eldbl.ieee.exponent; \ + \ + if (exponent == 0) \ + { \ + if (zero_mantissa) \ + expnegative = 0; \ + else \ + { \ + /* This is a denormalized number. */ \ + expnegative = 1; \ + exponent = IBM_EXTENDED_LONG_DOUBLE_BIAS - 1; \ + } \ + } \ + else if (exponent >= IBM_EXTENDED_LONG_DOUBLE_BIAS) \ + { \ + expnegative = 0; \ + exponent -= IBM_EXTENDED_LONG_DOUBLE_BIAS; \ + } \ + else \ + { \ + expnegative = 1; \ + exponent = -(exponent - IBM_EXTENDED_LONG_DOUBLE_BIAS); \ + } \ +} while (0) + +#include <stdio-common/printf_fphex.c> |