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30891f35fa
We stopped adding "Contributed by" or similar lines in sources in 2012 in favour of git logs and keeping the Contributors section of the glibc manual up to date. Removing these lines makes the license header a bit more consistent across files and also removes the possibility of error in attribution when license blocks or files are copied across since the contributed-by lines don't actually reflect reality in those cases. Move all "Contributed by" and similar lines (Written by, Test by, etc.) into a new file CONTRIBUTED-BY to retain record of these contributions. These contributors are also mentioned in manual/contrib.texi, so we just maintain this additional record as a courtesy to the earlier developers. The following scripts were used to filter a list of files to edit in place and to clean up the CONTRIBUTED-BY file respectively. These were not added to the glibc sources because they're not expected to be of any use in future given that this is a one time task: https://gist.github.com/siddhesh/b5ecac94eabfd72ed2916d6d8157e7dc https://gist.github.com/siddhesh/15ea1f5e435ace9774f485030695ee02 Reviewed-by: Carlos O'Donell <carlos@redhat.com>
139 lines
5.3 KiB
C
139 lines
5.3 KiB
C
/* Print floating point number in hexadecimal notation according to ISO C99.
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Copyright (C) 1997-2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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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<https://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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