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1da177e4 LT |
1 | /* IEEE754 floating point arithmetic |
2 | * double precision: common utilities | |
3 | */ | |
4 | /* | |
5 | * MIPS floating point support | |
6 | * Copyright (C) 1994-2000 Algorithmics Ltd. | |
1da177e4 LT |
7 | * |
8 | * ######################################################################## | |
9 | * | |
10 | * This program is free software; you can distribute it and/or modify it | |
11 | * under the terms of the GNU General Public License (Version 2) as | |
12 | * published by the Free Software Foundation. | |
13 | * | |
14 | * This program is distributed in the hope it will be useful, but WITHOUT | |
15 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
16 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
17 | * for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License along | |
20 | * with this program; if not, write to the Free Software Foundation, Inc., | |
21 | * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. | |
22 | * | |
23 | * ######################################################################## | |
24 | */ | |
25 | ||
26 | ||
27 | #include "ieee754dp.h" | |
28 | ||
29 | ieee754dp ieee754dp_scalb(ieee754dp x, int n) | |
30 | { | |
31 | COMPXDP; | |
32 | ||
33 | CLEARCX; | |
34 | ||
35 | EXPLODEXDP; | |
36 | ||
37 | switch (xc) { | |
38 | case IEEE754_CLASS_SNAN: | |
39 | return ieee754dp_nanxcpt(x, "scalb", x, n); | |
40 | case IEEE754_CLASS_QNAN: | |
41 | case IEEE754_CLASS_INF: | |
42 | case IEEE754_CLASS_ZERO: | |
43 | return x; | |
44 | case IEEE754_CLASS_DNORM: | |
45 | DPDNORMX; | |
46 | break; | |
47 | case IEEE754_CLASS_NORM: | |
48 | break; | |
49 | } | |
50 | DPNORMRET2(xs, xe + n, xm << 3, "scalb", x, n); | |
51 | } | |
52 | ||
53 | ||
54 | ieee754dp ieee754dp_ldexp(ieee754dp x, int n) | |
55 | { | |
56 | return ieee754dp_scalb(x, n); | |
57 | } |