mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-04 19:00:09 +00:00
140 lines
5.4 KiB
C
140 lines
5.4 KiB
C
/* Print floating point number in hexadecimal notation according to ISO C99.
|
|
Copyright (C) 1997-2020 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, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#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 u; \
|
|
u.ld = fpnum.ldbl; \
|
|
\
|
|
assert (sizeof (long double) == 16); \
|
|
\
|
|
lo = ((long long)u.d[1].ieee.mantissa0 << 32) | u.d[1].ieee.mantissa1; \
|
|
hi = ((long long)u.d[0].ieee.mantissa0 << 32) | u.d[0].ieee.mantissa1; \
|
|
lo <<= 7; /* pre-shift lo to match ieee854. */ \
|
|
/* If the lower double is not a denormal or zero then set the hidden \
|
|
53rd bit. */ \
|
|
if (u.d[1].ieee.exponent != 0) \
|
|
lo |= (1ULL << (52 + 7)); \
|
|
else \
|
|
lo <<= 1; \
|
|
/* The lower double is normalized separately from the upper. We \
|
|
may need to adjust the lower manitissa to reflect this. */ \
|
|
ediff = u.d[0].ieee.exponent - u.d[1].ieee.exponent - 53; \
|
|
if (ediff > 63) \
|
|
lo = 0; \
|
|
else if (ediff > 0) \
|
|
lo = lo >> ediff; \
|
|
else if (ediff < 0) \
|
|
lo = lo << -ediff; \
|
|
if (u.d[0].ieee.negative != u.d[1].ieee.negative \
|
|
&& lo != 0) \
|
|
{ \
|
|
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); \
|
|
u.d[0].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 = u.d[0].ieee.exponent == 0 ? '0' : '1'; \
|
|
\
|
|
exponent = u.d[0].ieee.exponent; \
|
|
\
|
|
if (exponent == 0) \
|
|
{ \
|
|
if (zero_mantissa) \
|
|
expnegative = 0; \
|
|
else \
|
|
{ \
|
|
/* This is a denormalized number. */ \
|
|
expnegative = 1; \
|
|
exponent = IEEE754_DOUBLE_BIAS - 1; \
|
|
} \
|
|
} \
|
|
else if (exponent >= IEEE754_DOUBLE_BIAS) \
|
|
{ \
|
|
expnegative = 0; \
|
|
exponent -= IEEE754_DOUBLE_BIAS; \
|
|
} \
|
|
else \
|
|
{ \
|
|
expnegative = 1; \
|
|
exponent = -(exponent - IEEE754_DOUBLE_BIAS); \
|
|
} \
|
|
} while (0)
|
|
|
|
#include <stdio-common/printf_fphex.c>
|