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83 lines
3.2 KiB
C
83 lines
3.2 KiB
C
/* Macro to print floating point numbers in hexadecimal notation.
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Copyright (C) 2017-2023 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(FLOAT, VAR, IEEE854_UNION, IEEE854_BIAS) \
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do { \
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/* We have 112 bits of mantissa plus one implicit digit. Since \
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112 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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union IEEE854_UNION u; \
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u.d = VAR; \
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\
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assert (sizeof (FLOAT) == 16); \
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\
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num0 = (((unsigned long long int) u.ieee.mantissa0) << 32 \
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| u.ieee.mantissa1); \
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num1 = (((unsigned long long int) u.ieee.mantissa2) << 32 \
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| u.ieee.mantissa3); \
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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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numstr = _itoa_word (num1, numbuf + sizeof numbuf, 16, \
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info->spec == 'A'); \
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else \
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numstr = _itoa (num1, numbuf + sizeof numbuf, 16, \
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info->spec == 'A'); \
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\
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while (numstr > numbuf + (sizeof numbuf - 64 / 4)) \
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*--numstr = '0'; \
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\
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if (sizeof (unsigned long int) > 6) \
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numstr = _itoa_word (num0, numstr, 16, info->spec == 'A'); \
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else \
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numstr = _itoa (num0, numstr, 16, info->spec == 'A'); \
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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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*--numstr = '0'; \
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\
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leading = u.ieee.exponent == 0 ? '0' : '1'; \
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\
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exponent = u.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 = IEEE854_BIAS - 1; \
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} \
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} \
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else if (exponent >= IEEE854_BIAS) \
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{ \
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expnegative = 0; \
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exponent -= IEEE854_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 - IEEE854_BIAS); \
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} \
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} while (0)
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