Last change
on this file since 403 was 337, checked in by coas-nagasima, 6 years ago |
ASP3版ECNLを追加
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Property svn:eol-style
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Property svn:mime-type
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File size:
915 bytes
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1 | /* origin: FreeBSD /usr/src/lib/msun/src/e_scalb.c */
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2 | /*
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3 | * ====================================================
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4 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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5 | *
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6 | * Developed at SunSoft, a Sun Microsystems, Inc. business.
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7 | * Permission to use, copy, modify, and distribute this
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8 | * software is freely granted, provided that this notice
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9 | * is preserved.
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10 | * ====================================================
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11 | */
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12 | /*
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13 | * scalb(x, fn) is provide for
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14 | * passing various standard test suite. One
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15 | * should use scalbn() instead.
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16 | */
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17 |
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18 | #define _GNU_SOURCE
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19 | #include <math.h>
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20 |
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21 | double scalb(double x, double fn)
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22 | {
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23 | if (isnan(x) || isnan(fn))
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24 | return x*fn;
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25 | if (!isfinite(fn)) {
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26 | if (fn > 0.0)
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27 | return x*fn;
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28 | else
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29 | return x/(-fn);
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30 | }
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31 | if (rint(fn) != fn) return (fn-fn)/(fn-fn);
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32 | if ( fn > 65000.0) return scalbn(x, 65000);
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33 | if (-fn > 65000.0) return scalbn(x,-65000);
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34 | return scalbn(x,(int)fn);
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35 | }
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