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60 lines
1.7 KiB
C
60 lines
1.7 KiB
C
/* Copyright (C) 2013-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, see <https://www.gnu.org/licenses/>. */
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/* ISA 2.07 provides fast GPR to FP instruction (mfvsr{d,wz}) which make
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generic implementation faster. Also disables for old ISAs that do not
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have ceil/floor instructions. */
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#if defined(_ARCH_PWR8) || !defined(_ARCH_PWR5X)
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# include <sysdeps/ieee754/ldbl-opt/s_modf.c>
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#else
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# include <math.h>
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# include <math_ldbl_opt.h>
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# include <libm-alias-double.h>
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double
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__modf (double x, double *iptr)
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{
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if (__builtin_isinf (x))
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{
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*iptr = x;
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return copysign (0.0, x);
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}
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else if (__builtin_isnan (x))
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{
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*iptr = NAN;
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return NAN;
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}
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if (x >= 0.0)
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{
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*iptr = floor (x);
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return copysign (x - *iptr, x);
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}
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else
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{
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*iptr = ceil (x);
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return copysign (x - *iptr, x);
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}
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}
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# ifndef __modf
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libm_alias_double (__modf, modf)
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# if LONG_DOUBLE_COMPAT (libc, GLIBC_2_0)
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compat_symbol (libc, __modf, modfl, GLIBC_2_0);
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# endif
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# endif
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#endif
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