1 /* Copyright (C) 1997-2022 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library. If not, see
16 <https://www.gnu.org/licenses/>. */
19 #include <math_private.h>
21 #include <libm-alias-finite.h>
27 #define float_type double
30 #define CONCATX(a,b) __CONCAT(a,b)
31 #define s(name) CONCATX(name,SUFF)
32 #define m81(func) __m81_u(s(func))
35 s(__ieee754_scalb
) (float_type x
, float_type fn
)
38 unsigned long x_cond
= __m81_test (x
);
39 unsigned long fn_cond
= __m81_test (fn
);
41 if ((x_cond
| fn_cond
) & __M81_COND_NAN
)
44 if (fn_cond
& __M81_COND_INF
)
46 if (!(fn_cond
& __M81_COND_NEG
))
48 else if (x_cond
& __M81_COND_ZERO
)
54 if (m81(__rint
) (fn
) != fn
)
55 return (x
- x
) / (x
- x
);
57 __asm ("fscale%.x %1, %0" : "=f" (retval
) : "f" (fn
), "0" (x
));
60 libm_alias_finite (s(__ieee754_scalb
), s (__scalb
))