1 /* e_scalbf.c -- float version of e_scalb.c. 2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. 3 */ 4 5 /* 6 * ==================================================== 7 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. 8 * 9 * Developed at SunPro, a Sun Microsystems, Inc. business. 10 * Permission to use, copy, modify, and distribute this 11 * software is freely granted, provided that this notice 12 * is preserved. 13 * ==================================================== 14 */ 15 16 #ifndef lint 17 static char rcsid[] = "$FreeBSD$"; 18 #endif 19 20 #include "math.h" 21 #include "math_private.h" 22 23 /* XXX lost declaration of this and isnan() in math.h but still have funcs. */ 24 int (isnanf)(float x); 25 26 #ifdef _SCALB_INT 27 float 28 __ieee754_scalbf(float x, int fn) 29 #else 30 float 31 __ieee754_scalbf(float x, float fn) 32 #endif 33 { 34 #ifdef _SCALB_INT 35 return scalbnf(x,fn); 36 #else 37 if ((isnanf)(x)||(isnanf)(fn)) return x*fn; 38 if (!finitef(fn)) { 39 if(fn>(float)0.0) return x*fn; 40 else return x/(-fn); 41 } 42 if (rintf(fn)!=fn) return (fn-fn)/(fn-fn); 43 if ( fn > (float)65000.0) return scalbnf(x, 65000); 44 if (-fn > (float)65000.0) return scalbnf(x,-65000); 45 return scalbnf(x,(int)fn); 46 #endif 47 } 48