1 /* Copyright (C) 2011-2016 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@gmail.com>, 2011.
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.
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.
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 <http://www.gnu.org/licenses/>. */
20 #include "math_private.h"
22 #if defined __UCLIBC_SUSV3_LEGACY__
24 #if defined(__UCLIBC_HAS_FENV__)
28 __attribute__ ((noinline
))
29 sysv_scalb (double x
, double fn
)
31 double z
= __ieee754_scalb (x
, fn
);
33 if (__builtin_expect (isinf (z
), 0))
36 return __kernel_standard (x
, fn
, 32); /* scalb overflow */
40 else if (__builtin_expect (z
== 0.0, 0) && z
!= x
)
41 return __kernel_standard (x
, fn
, 33); /* scalb underflow */
45 #endif /* __UCLIBC_HAS_FENV__ */
49 scalb (double x
, double fn
)
51 #if defined(__UCLIBC_HAS_FENV__)
52 if (__builtin_expect (_LIB_VERSION
== _SVID_
,0))
53 return sysv_scalb (x
, fn
);
56 double z
= __ieee754_scalb (x
, fn
);
58 if (__builtin_expect (!isfinite (z
) || z
== 0.0, 0))
62 if (!isnan (x
) && !isnan (fn
))
67 if (!isinf (x
) && !isinf (fn
))
73 if (x
!= 0.0 && !isinf (fn
))
80 return __ieee754_scalb (x
, fn
);
81 #endif /* __UCLIBC_HAS_FENV__ */
84 libm_hidden_def(scalb
)