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581c785b | 1 | /* Copyright (C) 2013-2022 Free Software Foundation, Inc. |
3c026539 AZ |
2 | This file is part of the GNU C Library |
3 | ||
4 | The GNU C Library is free software; you can redistribute it and/or | |
5 | modify it under the terms of the GNU Library General Public License as | |
6 | published by the Free Software Foundation; either version 2 of the | |
7 | License, or (at your option) any later version. | |
8 | ||
9 | The GNU C Library is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | Library General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU Library General Public | |
15 | License along with the GNU C Library; see the file COPYING.LIB. If | |
5a82c748 | 16 | not, see <https://www.gnu.org/licenses/>. */ |
3c026539 | 17 | |
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18 | /* ISA 2.07 provides fast GPR to FP instruction (mfvsr{d,wz}) which make |
19 | generic implementation faster. Also disables for old ISAs that do not | |
20 | have ceil/floor instructions. */ | |
21 | #if defined(_ARCH_PWR8) || !defined(_ARCH_PWR5X) | |
22 | # include <sysdeps/ieee754/ldbl-opt/s_modf.c> | |
23 | #else | |
24 | # include <math.h> | |
25 | # include <math_ldbl_opt.h> | |
26 | # include <libm-alias-double.h> | |
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27 | |
28 | double | |
29 | __modf (double x, double *iptr) | |
30 | { | |
31 | if (__builtin_isinf (x)) | |
32 | { | |
33 | *iptr = x; | |
81dca813 | 34 | return copysign (0.0, x); |
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35 | } |
36 | else if (__builtin_isnan (x)) | |
37 | { | |
38 | *iptr = NAN; | |
39 | return NAN; | |
40 | } | |
41 | ||
42 | if (x >= 0.0) | |
43 | { | |
e44acb20 | 44 | *iptr = floor (x); |
81dca813 | 45 | return copysign (x - *iptr, x); |
3c026539 AZ |
46 | } |
47 | else | |
48 | { | |
71223ef9 | 49 | *iptr = ceil (x); |
81dca813 | 50 | return copysign (x - *iptr, x); |
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51 | } |
52 | } | |
931c616e | 53 | # ifndef __modf |
51ea3b20 | 54 | libm_alias_double (__modf, modf) |
931c616e | 55 | # if LONG_DOUBLE_COMPAT (libc, GLIBC_2_0) |
3c026539 | 56 | compat_symbol (libc, __modf, modfl, GLIBC_2_0); |
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57 | # endif |
58 | # endif | |
3c026539 | 59 | #endif |