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| 2 | /* @(#)e_scalb.c 5.1 93/09/24 */
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| 3 | /*
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| 4 | * ====================================================
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| 5 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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| 6 | *
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| 7 | * Developed at SunPro, a Sun Microsystems, Inc. business.
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| 8 | * Permission to use, copy, modify, and distribute this
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| 9 | * software is freely granted, provided that this notice
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| 10 | * is preserved.
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| 11 | * ====================================================
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| 12 | */
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| 13 |
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| 14 | /*
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| 15 | * __ieee754_scalb(x, fn) is provide for
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| 16 | * passing various standard test suite. One
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| 17 | * should use scalbn() instead.
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| 18 | */
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| 19 |
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| 20 | #include "fdlibm.h"
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| 21 |
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| 22 | #ifndef _DOUBLE_IS_32BITS
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| 23 |
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| 24 | #ifdef _SCALB_INT
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| 25 | #ifdef __STDC__
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| 26 | double __ieee754_scalb(double x, int fn)
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| 27 | #else
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| 28 | double __ieee754_scalb(x,fn)
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| 29 | double x; int fn;
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| 30 | #endif
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| 31 | #else
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| 32 | #ifdef __STDC__
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| 33 | double __ieee754_scalb(double x, double fn)
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| 34 | #else
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| 35 | double __ieee754_scalb(x,fn)
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| 36 | double x, fn;
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| 37 | #endif
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| 38 | #endif
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| 39 | {
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| 40 | #ifdef _SCALB_INT
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| 41 | return scalbn(x,fn);
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| 42 | #else
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| 43 | if (isnan(x)||isnan(fn)) return x*fn;
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| 44 | if (!finite(fn)) {
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| 45 | if(fn>0.0) return x*fn;
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| 46 | else return x/(-fn);
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| 47 | }
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| 48 | if (rint(fn)!=fn) return (fn-fn)/(fn-fn);
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| 49 | if ( fn > 65000.0) return scalbn(x, 65000);
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| 50 | if (-fn > 65000.0) return scalbn(x,-65000);
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| 51 | return scalbn(x,(int)fn);
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| 52 | #endif
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| 53 | }
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| 54 |
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| 55 | #endif /* defined(_DOUBLE_IS_32BITS) */
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