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 #include <sys/cdefs.h> 17 #include "math.h" 18 #include "math_private.h" 19 20 #ifdef _SCALB_INT 21 float 22 scalbf(float x, int fn) 23 #else 24 float 25 scalbf(float x, float fn) 26 #endif 27 { 28 #ifdef _SCALB_INT 29 return scalbnf(x,fn); 30 #else 31 if ((isnanf)(x)||(isnanf)(fn)) return x*fn; 32 if (!finitef(fn)) { 33 if(fn>(float)0.0) return x*fn; 34 else return x/(-fn); 35 } 36 if (rintf(fn)!=fn) return (fn-fn)/(fn-fn); 37 if ( fn > (float)65000.0) return scalbnf(x, 65000); 38 if (-fn > (float)65000.0) return scalbnf(x,-65000); 39 return scalbnf(x,(int)fn); 40 #endif 41 } 42