diff options
Diffstat (limited to 'math/e_scalbf.c')
| -rw-r--r-- | math/e_scalbf.c | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/math/e_scalbf.c b/math/e_scalbf.c new file mode 100644 index 0000000000..95a72eb56d --- /dev/null +++ b/math/e_scalbf.c @@ -0,0 +1,68 @@ +/* e_scalbf.c -- float version of e_scalb.c. + * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. + */ + +/* + * ==================================================== + * 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_scalbf.c,v 1.3 1995/05/10 20:46:12 jtc Exp $"; +#endif + +#include <fenv.h> +#include <math.h> +#include "math_private.h" + +#ifdef _SCALB_INT +#ifdef __STDC__ + float __ieee754_scalbf(float x, int fn) +#else + float __ieee754_scalbf(x,fn) + float x; int fn; +#endif +#else +#ifdef __STDC__ + float __ieee754_scalbf(float x, float fn) +#else + float __ieee754_scalbf(x,fn) + float x, fn; +#endif +#endif +{ +#ifdef _SCALB_INT + return __scalbnf(x,fn); +#else + if (__isnanf(x)||__isnanf(fn)) return x*fn; + if (!__finitef(fn)) { + if(fn>(float)0.0) return x*fn; + else if (x == 0) + return x; + else if (!__finitef (x)) + { +# ifdef FE_INVALID + feraiseexcept (FE_INVALID); +# endif + return __nanf (""); + } + else return x/(-fn); + } + if (__rintf(fn)!=fn) + { +# ifdef FE_INVALID + feraiseexcept (FE_INVALID); +# endif + return __nanf (""); + } + if ( fn > (float)65000.0) return __scalbnf(x, 65000); + if (-fn > (float)65000.0) return __scalbnf(x,-65000); + return __scalbnf(x,(int)fn); +#endif +} |