e_scalbf.c (1158B)
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: src/lib/msun/src/e_scalbf.c,v 1.9 2004/07/09 10:01:10 das Exp $"; 18 #endif 19 20 #include "math.h" 21 #include "math_private.h" 22 23 #ifdef _SCALB_INT 24 float 25 __ieee754_scalbf(float x, int fn) 26 #else 27 float 28 __ieee754_scalbf(float x, float fn) 29 #endif 30 { 31 #ifdef _SCALB_INT 32 return scalbnf(x,fn); 33 #else 34 if ((isnanf)(x)||(isnanf)(fn)) return x*fn; 35 if (!finitef(fn)) { 36 if(fn>(float)0.0) return x*fn; 37 else return x/(-fn); 38 } 39 if (rintf(fn)!=fn) return (fn-fn)/(fn-fn); 40 if ( fn > (float)65000.0) return scalbnf(x, 65000); 41 if (-fn > (float)65000.0) return scalbnf(x,-65000); 42 return scalbnf(x,(int)fn); 43 #endif 44 }