| 1 | /* Copyright (C) 2013-2024 Free Software Foundation, Inc. |
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| 2 | This file is part of the GNU C Library |
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| 3 | |
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| 4 | The GNU C Library is free software; you can redistribute it and/or |
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| 5 | modify it under the terms of the GNU Library General Public License as |
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| 6 | published by the Free Software Foundation; either version 2 of the |
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| 7 | License, or (at your option) any later version. |
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| 8 | |
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| 9 | The GNU C Library is distributed in the hope that it will be useful, |
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 12 | Library General Public License for more details. |
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| 13 | |
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| 14 | You should have received a copy of the GNU Library General Public |
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| 15 | License along with the GNU C Library; see the file COPYING.LIB. If |
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| 16 | not, see <https://www.gnu.org/licenses/>. */ |
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| 17 | |
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| 18 | /* ISA 2.07 provides fast GPR to FP instruction (mfvsr{d,wz}) which make |
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| 19 | generic implementation faster. Also disables for old ISAs that do not |
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| 20 | have ceil/floor instructions. */ |
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| 21 | #if defined(_ARCH_PWR8) || !defined(_ARCH_PWR5X) |
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| 22 | # include <sysdeps/ieee754/ldbl-opt/s_modf.c> |
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| 23 | #else |
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| 24 | # include <math.h> |
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| 25 | # include <math_ldbl_opt.h> |
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| 26 | # include <libm-alias-double.h> |
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| 27 | |
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| 28 | double |
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| 29 | __modf (double x, double *iptr) |
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| 30 | { |
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| 31 | if (__builtin_isinf (x)) |
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| 32 | { |
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| 33 | *iptr = x; |
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| 34 | return copysign (0.0, x); |
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| 35 | } |
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| 36 | else if (__builtin_isnan (x)) |
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| 37 | { |
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| 38 | *iptr = NAN; |
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| 39 | return NAN; |
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| 40 | } |
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| 41 | |
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| 42 | if (x >= 0.0) |
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| 43 | { |
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| 44 | *iptr = floor (x); |
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| 45 | return copysign (x - *iptr, x); |
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| 46 | } |
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| 47 | else |
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| 48 | { |
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| 49 | *iptr = ceil (x); |
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| 50 | return copysign (x - *iptr, x); |
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| 51 | } |
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| 52 | } |
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| 53 | # ifndef __modf |
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| 54 | libm_alias_double (__modf, modf) |
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| 55 | # if LONG_DOUBLE_COMPAT (libc, GLIBC_2_0) |
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| 56 | compat_symbol (libc, __modf, modfl, GLIBC_2_0); |
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| 57 | # endif |
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| 58 | # endif |
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| 59 | #endif |
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| 60 | |
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