1 /* Print floating point number in hexadecimal notation according to ISO C99. 2 Copyright (C) 1997-2021 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library; if not, see 17 <https://www.gnu.org/licenses/>. */ 18 19 #ifndef LONG_DOUBLE_DENORM_BIAS 20 # define LONG_DOUBLE_DENORM_BIAS (IEEE854_LONG_DOUBLE_BIAS - 1) 21 #endif 22 23 #define PRINT_FPHEX_LONG_DOUBLE \ 24 do { \ 25 /* The "strange" 80 bit format on ix86 and m68k has an explicit \ 26 leading digit in the 64 bit mantissa. */ \ 27 unsigned long long int num; \ 28 union ieee854_long_double u; \ 29 u.d = fpnum.ldbl; \ 30 \ 31 num = (((unsigned long long int) u.ieee.mantissa0) << 32 \ 32 | u.ieee.mantissa1); \ 33 \ 34 zero_mantissa = num == 0; \ 35 \ 36 if (sizeof (unsigned long int) > 6) \ 37 { \ 38 numstr = _itoa_word (num, numbuf + sizeof numbuf, 16, \ 39 info->spec == 'A'); \ 40 wnumstr = _itowa_word (num, \ 41 wnumbuf + sizeof (wnumbuf) / sizeof (wchar_t),\ 42 16, info->spec == 'A'); \ 43 } \ 44 else \ 45 { \ 46 numstr = _itoa (num, numbuf + sizeof numbuf, 16, info->spec == 'A');\ 47 wnumstr = _itowa (num, \ 48 wnumbuf + sizeof (wnumbuf) / sizeof (wchar_t), \ 49 16, info->spec == 'A'); \ 50 } \ 51 \ 52 /* Fill with zeroes. */ \ 53 while (numstr > numbuf + (sizeof numbuf - 64 / 4)) \ 54 { \ 55 *--numstr = '0'; \ 56 *--wnumstr = L'0'; \ 57 } \ 58 \ 59 /* We use a full nibble for the leading digit. */ \ 60 leading = *numstr++; \ 61 wnumstr++; \ 62 \ 63 /* We have 3 bits from the mantissa in the leading nibble. \ 64 Therefore we are here using `IEEE854_LONG_DOUBLE_BIAS + 3'. */ \ 65 exponent = u.ieee.exponent; \ 66 \ 67 if (exponent == 0) \ 68 { \ 69 if (zero_mantissa) \ 70 expnegative = 0; \ 71 else \ 72 { \ 73 /* This is a denormalized number. */ \ 74 expnegative = 1; \ 75 /* This is a hook for the m68k long double format, where the \ 76 exponent bias is the same for normalized and denormalized \ 77 numbers. */ \ 78 exponent = LONG_DOUBLE_DENORM_BIAS + 3; \ 79 } \ 80 } \ 81 else if (exponent >= IEEE854_LONG_DOUBLE_BIAS + 3) \ 82 { \ 83 expnegative = 0; \ 84 exponent -= IEEE854_LONG_DOUBLE_BIAS + 3; \ 85 } \ 86 else \ 87 { \ 88 expnegative = 1; \ 89 exponent = -(exponent - (IEEE854_LONG_DOUBLE_BIAS + 3)); \ 90 } \ 91 } while (0) 92 93 #include <stdio-common/printf_fphex.c> 94