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Diffstat (limited to 'libm/src/e_scalb.c')
-rw-r--r-- | libm/src/e_scalb.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/libm/src/e_scalb.c b/libm/src/e_scalb.c new file mode 100644 index 0000000..b81666e --- /dev/null +++ b/libm/src/e_scalb.c @@ -0,0 +1,48 @@ + +/* @(#)e_scalb.c 1.3 95/01/18 */ +/* + * ==================================================== + * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. + * + * Developed at SunSoft, a Sun Microsystems, Inc. business. + * Permission to use, copy, modify, and distribute this + * software is freely granted, provided that this notice + * is preserved. + * ==================================================== + */ + +#ifndef lint +static char rcsid[] = "$FreeBSD: src/lib/msun/src/e_scalb.c,v 1.12 2005/02/04 18:26:06 das Exp $"; +#endif + +/* + * __ieee754_scalb(x, fn) is provide for + * passing various standard test suite. One + * should use scalbn() instead. + */ + +#include "math.h" +#include "math_private.h" + +#ifdef _SCALB_INT +double +__ieee754_scalb(double x, int fn) +#else +double +__ieee754_scalb(double x, double fn) +#endif +{ +#ifdef _SCALB_INT + return scalbn(x,fn); +#else + if (isnan(x)||isnan(fn)) return x*fn; + if (!finite(fn)) { + if(fn>0.0) return x*fn; + else return x/(-fn); + } + if (rint(fn)!=fn) return (fn-fn)/(fn-fn); + if ( fn > 65000.0) return scalbn(x, 65000); + if (-fn > 65000.0) return scalbn(x,-65000); + return scalbn(x,(int)fn); +#endif +} |