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56 lines
1.6 KiB
C
56 lines
1.6 KiB
C
/* Copyright (C) 2013-2023 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/flt-32/s_modff.c>
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#else
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# include <math.h>
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# include <libm-alias-float.h>
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float
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__modff (float x, float *iptr)
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{
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if (__builtin_isinff (x))
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{
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*iptr = x;
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return copysignf (0.0, x);
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}
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else if (__builtin_isnanf (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 = floorf (x);
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return copysignf (x - *iptr, x);
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}
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else
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{
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*iptr = ceilf (x);
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return copysignf (x - *iptr, x);
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}
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}
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# ifndef __modff
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libm_alias_float (__modf, modf)
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# endif
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#endif
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