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- /* @(#)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 "math.h"
- #include "math_private.h"
- #ifdef _SCALB_INT
- #ifdef __STDC__
- double attribute_hidden __ieee754_scalb(double x, int fn)
- #else
- double attribute_hidden __ieee754_scalb(x,fn)
- double x; int fn;
- #endif
- #else
- #ifdef __STDC__
- double attribute_hidden __ieee754_scalb(double x, double fn)
- #else
- double attribute_hidden __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 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
- }
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