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43 lines
1019 B
C
43 lines
1019 B
C
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/* @(#)e_scalb.c 1.3 95/01/18 */
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/*
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* ====================================================
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* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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*
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* Developed at SunSoft, a Sun Microsystems, Inc. business.
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* Permission to use, copy, modify, and distribute this
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* software is freely granted, provided that this notice
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* is preserved.
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* ====================================================
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*/
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/*
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* __fdlibm_scalb(x, fn) is provide for
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* passing various standard test suite. One
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* should use scalbn() instead.
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*/
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#include "math.h"
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#ifdef _SCALB_INT
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double __fdlibm_scalb(double x, int fn)
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#else
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double __fdlibm_scalb(double x, double fn)
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#endif
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{
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#ifdef _SCALB_INT
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return scalbn(x, fn);
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#else
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if(isnan(x) || isnan(fn)) return x * fn;
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if(!finite(fn)) {
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if(fn > 0.0) return x * fn;
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else
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return x / (-fn);
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}
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if(rint(fn) != fn) return (fn - fn) / (fn - fn);
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if(fn > 65000.0) return scalbn(x, 65000);
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if(-fn > 65000.0) return scalbn(x, -65000);
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return scalbn(x, (int)fn);
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#endif
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}
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