1 /* Print floating point number in hexadecimal notation according to ISO C99. 2 Copyright (C) 2000-2021 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 ia64 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 numstr = _itoa_word (num, numbuf + sizeof numbuf, 16, \ 37 info->spec == 'A'); \ 38 wnumstr = _itowa_word (num, \ 39 wnumbuf + sizeof (wnumbuf) / sizeof (wchar_t), \ 40 16, info->spec == 'A'); \ 41 \ 42 /* Fill with zeroes. */ \ 43 while (numstr > numbuf + (sizeof numbuf - 64 / 4)) \ 44 { \ 45 *--numstr = '0'; \ 46 *--wnumstr = L'0'; \ 47 } \ 48 \ 49 /* We use a full nibble for the leading digit. */ \ 50 leading = *numstr++; \ 51 \ 52 /* We have 3 bits from the mantissa in the leading nibble. \ 53 Therefore we are here using `IEEE854_LONG_DOUBLE_BIAS + 3'. */ \ 54 exponent = u.ieee.exponent; \ 55 \ 56 if (exponent == 0) \ 57 { \ 58 if (zero_mantissa) \ 59 expnegative = 0; \ 60 else \ 61 { \ 62 /* This is a denormalized number. */ \ 63 expnegative = 1; \ 64 /* This is a hook for the m68k long double format, where the \ 65 exponent bias is the same for normalized and denormalized \ 66 numbers. */ \ 67 exponent = LONG_DOUBLE_DENORM_BIAS + 3; \ 68 } \ 69 } \ 70 else if (exponent >= IEEE854_LONG_DOUBLE_BIAS + 3) \ 71 { \ 72 expnegative = 0; \ 73 exponent -= IEEE854_LONG_DOUBLE_BIAS + 3; \ 74 } \ 75 else \ 76 { \ 77 expnegative = 1; \ 78 exponent = -(exponent - (IEEE854_LONG_DOUBLE_BIAS + 3)); \ 79 } \ 80 } while (0) 81 82 #include <stdio-common/printf_fphex.c> 83