| |
| /* @(#)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. |
| * ==================================================== |
| */ |
| |
| /* |
| * __ieee754_scalb(x, fn) is provide for |
| * passing various standard test suite. One |
| * should use scalbn() instead. |
| */ |
| |
| #include "fdlibm.h" |
| |
| #ifndef _DOUBLE_IS_32BITS |
| |
| #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 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 |
| } |
| |
| #endif /* defined(_DOUBLE_IS_32BITS) */ |
