1 | /* ef_scalb.c -- float version of e_scalb.c. |
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2 | * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. |
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3 | */ |
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4 | |
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5 | /* |
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6 | * ==================================================== |
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7 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
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8 | * |
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9 | * Developed at SunPro, a Sun Microsystems, Inc. business. |
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10 | * Permission to use, copy, modify, and distribute this |
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11 | * software is freely granted, provided that this notice |
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12 | * is preserved. |
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13 | * ==================================================== |
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14 | */ |
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15 | |
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16 | #include "fdlibm.h" |
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17 | #include <limits.h> |
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18 | |
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19 | #ifdef _SCALB_INT |
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20 | #ifdef __STDC__ |
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21 | float __ieee754_scalbf(float x, int fn) |
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22 | #else |
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23 | float __ieee754_scalbf(x,fn) |
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24 | float x; int fn; |
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25 | #endif |
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26 | #else |
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27 | #ifdef __STDC__ |
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28 | float __ieee754_scalbf(float x, float fn) |
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29 | #else |
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30 | float __ieee754_scalbf(x,fn) |
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31 | float x, fn; |
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32 | #endif |
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33 | #endif |
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34 | { |
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35 | #ifdef _SCALB_INT |
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36 | return scalbnf(x,fn); |
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37 | #else |
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38 | if (isnan(x)||isnan(fn)) return x*fn; |
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39 | if (!finitef(fn)) { |
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40 | if(fn>(float)0.0) return x*fn; |
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41 | else return x/(-fn); |
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42 | } |
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43 | if (rintf(fn)!=fn) return (fn-fn)/(fn-fn); |
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44 | #if INT_MAX > 65000 |
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45 | if ( fn > (float)65000.0) return scalbnf(x, 65000); |
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46 | if (-fn > (float)65000.0) return scalbnf(x,-65000); |
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47 | #else |
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48 | if ( fn > (float)32000.0) return scalbnf(x, 32000); |
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49 | if (-fn > (float)32000.0) return scalbnf(x,-32000); |
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50 | #endif |
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51 | return scalbnf(x,(int)fn); |
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52 | #endif |
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53 | } |
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