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_HAS_FENV__)
26 __attribute__ ((noinline
))
27 sysv_scalb (double x
, double fn
)
29 double z
= __ieee754_scalb (x
, fn
);
31 if (__builtin_expect (isinf (z
), 0))
34 return __kernel_standard (x
, fn
, 32); /* scalb overflow */
38 else if (__builtin_expect (z
== 0.0, 0) && z
!= x
)
39 return __kernel_standard (x
, fn
, 33); /* scalb underflow */
43 #endif /* __UCLIBC_HAS_FENV__ */
45 /* Here might be a check like "#if defined __UCLIBC_SUSV3_LEGACY__"
46 * but because there is a sysv_scalb() func, it was decided
47 * not to check yhis macro.
52 scalb (double x
, double fn
)
54 #if defined(__UCLIBC_HAS_FENV__)
55 if (__builtin_expect (_LIB_VERSION
== _SVID_
,0))
56 return sysv_scalb (x
, fn
);
59 double z
= __ieee754_scalb (x
, fn
);
61 if (__builtin_expect (!isfinite (z
) || z
== 0.0, 0))
65 if (!isnan (x
) && !isnan (fn
))
70 if (!isinf (x
) && !isinf (fn
))
76 if (x
!= 0.0 && !isinf (fn
))
83 return __ieee754_scalb (x
, fn
);
84 #endif /* __UCLIBC_HAS_FENV__ */
86 libm_hidden_def(scalb
)