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1 /* Copyright (C) 1997-2020 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>.
4
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.
9
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.
14
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 <https://www.gnu.org/licenses/>. */
18
19 #include <math.h>
20 #include <math_private.h>
21 #include "mathimpl.h"
22 #include <libm-alias-finite.h>
23
24 #ifndef SUFF
25 #define SUFF
26 #endif
27 #ifndef float_type
28 #define float_type double
29 #endif
30
31 #define CONCATX(a,b) __CONCAT(a,b)
32 #define s(name) CONCATX(name,SUFF)
33 #define m81(func) __m81_u(s(func))
34
35 float_type
36 s(__ieee754_scalb) (float_type x, float_type fn)
37 {
38 float_type retval;
39 unsigned long x_cond = __m81_test (x);
40 unsigned long fn_cond = __m81_test (fn);
41
42 if ((x_cond | fn_cond) & __M81_COND_NAN)
43 return x * fn;
44
45 if (fn_cond & __M81_COND_INF)
46 {
47 if (!(fn_cond & __M81_COND_NEG))
48 return x * fn;
49 else if (x_cond & __M81_COND_ZERO)
50 return x;
51 else
52 return x / -fn;
53 }
54
55 if (m81(__rint) (fn) != fn)
56 return (x - x) / (x - x);
57
58 __asm ("fscale%.x %1, %0" : "=f" (retval) : "f" (fn), "0" (x));
59 return retval;
60 }
61 libm_alias_finite (s(__ieee754_scalb), s (__scalb))