1 | /* Copyright (C) 1997-2024 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. |
3 | |
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. |
8 | |
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. |
13 | |
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/>. */ |
17 | |
18 | #include <math.h> |
19 | #include <math_private.h> |
20 | #include "mathimpl.h" |
21 | #include <libm-alias-finite.h> |
22 | |
23 | #ifndef SUFF |
24 | #define SUFF |
25 | #endif |
26 | #ifndef float_type |
27 | #define float_type double |
28 | #endif |
29 | |
30 | #define CONCATX(a,b) __CONCAT(a,b) |
31 | #define s(name) CONCATX(name,SUFF) |
32 | #define m81(func) __m81_u(s(func)) |
33 | |
34 | float_type |
35 | s(__ieee754_scalb) (float_type x, float_type fn) |
36 | { |
37 | float_type retval; |
38 | unsigned long x_cond = __m81_test (val: x); |
39 | unsigned long fn_cond = __m81_test (val: fn); |
40 | |
41 | if ((x_cond | fn_cond) & __M81_COND_NAN) |
42 | return x * fn; |
43 | |
44 | if (fn_cond & __M81_COND_INF) |
45 | { |
46 | if (!(fn_cond & __M81_COND_NEG)) |
47 | return x * fn; |
48 | else if (x_cond & __M81_COND_ZERO) |
49 | return x; |
50 | else |
51 | return x / -fn; |
52 | } |
53 | |
54 | if (m81(__rint) (mathop_x: fn) != fn) |
55 | return (x - x) / (x - x); |
56 | |
57 | __asm ("fscale%.x %1, %0" : "=f" (retval) : "f" (fn), "0" (x)); |
58 | return retval; |
59 | } |
60 | libm_alias_finite (s(__ieee754_scalb), s (__scalb)) |
61 | |