source:
azure_iot_hub/trunk/musl-1.1.18/src/math/scalbf.c
Last change on this file was 389, checked in by , 5 years ago | |
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File size: 887 bytes |
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1 | /* origin: FreeBSD /usr/src/lib/msun/src/e_scalbf.c */ |
2 | /* |
3 | * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. |
4 | */ |
5 | /* |
6 | * ==================================================== |
7 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
8 | * |
9 | * Developed at SunPro, a Sun Microsystems, Inc. business. |
10 | * Permission to use, copy, modify, and distribute this |
11 | * software is freely granted, provided that this notice |
12 | * is preserved. |
13 | * ==================================================== |
14 | */ |
15 | |
16 | #define _GNU_SOURCE |
17 | #include <math.h> |
18 | |
19 | float scalbf(float x, float fn) |
20 | { |
21 | if (isnan(x) || isnan(fn)) return x*fn; |
22 | if (!isfinite(fn)) { |
23 | if (fn > 0.0f) |
24 | return x*fn; |
25 | else |
26 | return x/(-fn); |
27 | } |
28 | if (rintf(fn) != fn) return (fn-fn)/(fn-fn); |
29 | if ( fn > 65000.0f) return scalbnf(x, 65000); |
30 | if (-fn > 65000.0f) return scalbnf(x,-65000); |
31 | return scalbnf(x,(int)fn); |
32 | } |
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