1 | /* Print floating point number in hexadecimal notation according to ISO C99. |
2 | Copyright (C) 1997-2024 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 | assert (sizeof (long double) == 12); \ |
32 | \ |
33 | num = (((unsigned long long int) u.ieee.mantissa0) << 32 \ |
34 | | u.ieee.mantissa1); \ |
35 | \ |
36 | zero_mantissa = num == 0; \ |
37 | \ |
38 | if (sizeof (unsigned long int) > 6) \ |
39 | numstr = _itoa_word (num, numbuf + sizeof numbuf, 16, \ |
40 | info->spec == 'A'); \ |
41 | else \ |
42 | numstr = _itoa (num, numbuf + sizeof numbuf, 16, info->spec == 'A'); \ |
43 | \ |
44 | /* Fill with zeroes. */ \ |
45 | while (numstr > numbuf + (sizeof numbuf - 64 / 4)) \ |
46 | *--numstr = '0'; \ |
47 | \ |
48 | /* We use a full nibble for the leading digit. */ \ |
49 | leading = *numstr++; \ |
50 | \ |
51 | /* We have 3 bits from the mantissa in the leading nibble. \ |
52 | Therefore we are here using `IEEE854_LONG_DOUBLE_BIAS + 3'. */ \ |
53 | exponent = u.ieee.exponent; \ |
54 | \ |
55 | if (exponent == 0) \ |
56 | { \ |
57 | if (zero_mantissa) \ |
58 | expnegative = 0; \ |
59 | else \ |
60 | { \ |
61 | /* This is a denormalized number. */ \ |
62 | expnegative = 1; \ |
63 | /* This is a hook for the m68k long double format, where the \ |
64 | exponent bias is the same for normalized and denormalized \ |
65 | numbers. */ \ |
66 | exponent = LONG_DOUBLE_DENORM_BIAS + 3; \ |
67 | } \ |
68 | } \ |
69 | else if (exponent >= IEEE854_LONG_DOUBLE_BIAS + 3) \ |
70 | { \ |
71 | expnegative = 0; \ |
72 | exponent -= IEEE854_LONG_DOUBLE_BIAS + 3; \ |
73 | } \ |
74 | else \ |
75 | { \ |
76 | expnegative = 1; \ |
77 | exponent = -(exponent - (IEEE854_LONG_DOUBLE_BIAS + 3)); \ |
78 | } \ |
79 | } while (0) |
80 | |
81 | #include <stdio-common/printf_fphex.c> |
82 | |