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Diffstat (limited to 'math/e_scalb.c')
| -rw-r--r-- | math/e_scalb.c | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/math/e_scalb.c b/math/e_scalb.c new file mode 100644 index 0000000000..606af53724 --- /dev/null +++ b/math/e_scalb.c @@ -0,0 +1,71 @@ +/* @(#)e_scalb.c 5.1 93/09/24 */ +/* + * ==================================================== + * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. + * + * Developed at SunPro, a Sun Microsystems, Inc. business. + * Permission to use, copy, modify, and distribute this + * software is freely granted, provided that this notice + * is preserved. + * ==================================================== + */ + +#if defined(LIBM_SCCS) && !defined(lint) +static char rcsid[] = "$NetBSD: e_scalb.c,v 1.6 1995/05/10 20:46:09 jtc Exp $"; +#endif + +/* + * __ieee754_scalb(x, fn) is provide for + * passing various standard test suite. One + * should use scalbn() instead. + */ + +#include <fenv.h> +#include <math.h> +#include "math_private.h" + +#ifdef _SCALB_INT +#ifdef __STDC__ + double __ieee754_scalb(double x, int fn) +#else + double __ieee754_scalb(x,fn) + double x; int fn; +#endif +#else +#ifdef __STDC__ + double __ieee754_scalb(double x, double fn) +#else + double __ieee754_scalb(x,fn) + double x, fn; +#endif +#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 if (x == 0) + return x; + else if (!__finite (x)) + { +# ifdef FE_INVALID + feraiseexcept (FE_INVALID); +# endif + return __nan (""); + } + else return x/(-fn); + } + if (__rint(fn)!=fn) + { +# ifdef FE_INVALID + feraiseexcept (FE_INVALID); +# endif + return __nan (""); + } + if ( fn > 65000.0) return __scalbn(x, 65000); + if (-fn > 65000.0) return __scalbn(x,-65000); + return __scalbn(x,(int)fn); +#endif +} |