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/* Print floating point number in hexadecimal notation according to ISO C99.
Copyright (C) 1997-2024 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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'); \
else \
numstr = _itoa (num1, numbuf + sizeof numbuf, 16, \
info->spec == 'A'); \
\
while (numstr > numbuf + (sizeof numbuf - 64 / 4)) \
*--numstr = '0'; \
\
if (sizeof (unsigned long int) > 6) \
numstr = _itoa_word (num0, numstr, 16, info->spec == 'A'); \
else \
numstr = _itoa (num0, numstr, 16, info->spec == 'A'); \
\
/* Fill with zeroes. */ \
while (numstr > numbuf + (sizeof numbuf - 112 / 4)) \
*--numstr = '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>
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