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140 lines
5.4 KiB
C
140 lines
5.4 KiB
C
/* Print floating point number in hexadecimal notation according to ISO C99.
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Copyright (C) 1997-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#define PRINT_FPHEX_LONG_DOUBLE \
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do { \
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/* We have 105 bits of mantissa plus one implicit digit. Since \
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106 bits are representable without rest using hexadecimal \
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digits we use only the implicit digits for the number before \
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the decimal point. */ \
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unsigned long long int num0, num1; \
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unsigned long long hi, lo; \
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int ediff; \
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union ibm_extended_long_double u; \
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u.ld = fpnum.ldbl; \
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\
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assert (sizeof (long double) == 16); \
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\
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lo = ((long long)u.d[1].ieee.mantissa0 << 32) | u.d[1].ieee.mantissa1; \
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hi = ((long long)u.d[0].ieee.mantissa0 << 32) | u.d[0].ieee.mantissa1; \
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lo <<= 7; /* pre-shift lo to match ieee854. */ \
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/* If the lower double is not a denormal or zero then set the hidden \
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53rd bit. */ \
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if (u.d[1].ieee.exponent != 0) \
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lo |= (1ULL << (52 + 7)); \
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else \
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lo <<= 1; \
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/* The lower double is normalized separately from the upper. We \
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may need to adjust the lower manitissa to reflect this. */ \
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ediff = u.d[0].ieee.exponent - u.d[1].ieee.exponent - 53; \
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if (ediff > 63) \
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lo = 0; \
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else if (ediff > 0) \
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lo = lo >> ediff; \
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else if (ediff < 0) \
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lo = lo << -ediff; \
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if (u.d[0].ieee.negative != u.d[1].ieee.negative \
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&& lo != 0) \
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{ \
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lo = (1ULL << 60) - lo; \
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if (hi == 0L) \
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{ \
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/* we have a borrow from the hidden bit, so shift left 1. */ \
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hi = 0xffffffffffffeLL | (lo >> 59); \
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lo = 0xfffffffffffffffLL & (lo << 1); \
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u.d[0].ieee.exponent--; \
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} \
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else \
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hi--; \
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} \
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num1 = (hi << 60) | lo; \
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num0 = hi >> 4; \
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\
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zero_mantissa = (num0|num1) == 0; \
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\
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if (sizeof (unsigned long int) > 6) \
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{ \
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numstr = _itoa_word (num1, numbuf + sizeof numbuf, 16, \
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info->spec == 'A'); \
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wnumstr = _itowa_word (num1, \
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wnumbuf + sizeof (wnumbuf) / sizeof (wchar_t),\
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16, info->spec == 'A'); \
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} \
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else \
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{ \
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numstr = _itoa (num1, numbuf + sizeof numbuf, 16, \
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info->spec == 'A'); \
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wnumstr = _itowa (num1, \
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wnumbuf + sizeof (wnumbuf) / sizeof (wchar_t), \
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16, info->spec == 'A'); \
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} \
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\
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while (numstr > numbuf + (sizeof numbuf - 64 / 4)) \
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{ \
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*--numstr = '0'; \
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*--wnumstr = L'0'; \
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} \
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\
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if (sizeof (unsigned long int) > 6) \
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{ \
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numstr = _itoa_word (num0, numstr, 16, info->spec == 'A'); \
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wnumstr = _itowa_word (num0, wnumstr, 16, info->spec == 'A'); \
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} \
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else \
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{ \
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numstr = _itoa (num0, numstr, 16, info->spec == 'A'); \
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wnumstr = _itowa (num0, wnumstr, 16, info->spec == 'A'); \
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} \
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\
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/* Fill with zeroes. */ \
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while (numstr > numbuf + (sizeof numbuf - 112 / 4)) \
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{ \
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*--numstr = '0'; \
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*--wnumstr = L'0'; \
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} \
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\
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leading = u.d[0].ieee.exponent == 0 ? '0' : '1'; \
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\
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exponent = u.d[0].ieee.exponent; \
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\
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if (exponent == 0) \
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{ \
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if (zero_mantissa) \
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expnegative = 0; \
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else \
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{ \
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/* This is a denormalized number. */ \
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expnegative = 1; \
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exponent = IEEE754_DOUBLE_BIAS - 1; \
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} \
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} \
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else if (exponent >= IEEE754_DOUBLE_BIAS) \
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{ \
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expnegative = 0; \
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exponent -= IEEE754_DOUBLE_BIAS; \
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} \
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else \
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{ \
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expnegative = 1; \
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exponent = -(exponent - IEEE754_DOUBLE_BIAS); \
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} \
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} while (0)
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#include <stdio-common/printf_fphex.c>
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