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afbdca97 | 1 | /* Copyright (C) 1997, 1999 Free Software Foundation, Inc. |
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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 | |
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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. | |
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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 | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
478b92f0 | 14 | |
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15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, write to the Free | |
17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
18 | 02111-1307 USA. */ | |
478b92f0 | 19 | |
478b92f0 | 20 | #include <math.h> |
d2784f80 | 21 | #include "math_private.h" |
afbdca97 | 22 | #include "mathimpl.h" |
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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; | |
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51 | else |
52 | return x / -fn; | |
53 | } | |
54 | ||
55 | if (m81(__rint) (fn) != fn) | |
d2784f80 | 56 | return (x - x) / (x - x); |
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57 | |
58 | __asm ("fscale%.x %1, %0" : "=f" (retval) : "f" (fn), "0" (x)); | |
59 | return retval; | |
60 | } |