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 #if defined(LIBM_SCCS) && !defined(lint) 17 static char rcsid[] = "$NetBSD: e_scalbf.c,v 1.3 1995/05/10 20:46:12 jtc Exp $"; 18 #endif 19 20 #include "math.h" 21 #include "math_private.h" 22 23 #ifdef _SCALB_INT 24 float 25 scalbf(float x, int fn) 26 { 27 return scalbnf(x,fn); 28 } 29 30 #else 31 32 float 33 scalbf(float x, float fn) 34 { 35 if (isnanf(x)||isnanf(fn)) return x*fn; 36 if (!finitef(fn)) { 37 if(fn>(float)0.0) return x*fn; 38 else return x/(-fn); 39 } 40 if (rintf(fn)!=fn) return (fn-fn)/(fn-fn); 41 if ( fn > (float)65000.0) return scalbnf(x, 65000); 42 if (-fn > (float)65000.0) return scalbnf(x,-65000); 43 return scalbnf(x,(int)fn); 44 } 45 #endif 46