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[] = "$Id: e_scalbf.c,v 1.1.1.1 1994/08/19 09:39:57 jkh Exp $"; 18 #endif 19 20 #include "math.h" 21 #include "math_private.h" 22 23 #ifdef _SCALB_INT 24 #ifdef __STDC__ 25 float __ieee754_scalbf(float x, int fn) 26 #else 27 float __ieee754_scalbf(x,fn) 28 float x; int fn; 29 #endif 30 #else 31 #ifdef __STDC__ 32 float __ieee754_scalbf(float x, float fn) 33 #else 34 float __ieee754_scalbf(x,fn) 35 float x, fn; 36 #endif 37 #endif 38 { 39 #ifdef _SCALB_INT 40 return scalbnf(x,fn); 41 #else 42 if (isnanf(x)||isnanf(fn)) return x*fn; 43 if (!finitef(fn)) { 44 if(fn>(float)0.0) return x*fn; 45 else return x/(-fn); 46 } 47 if (rintf(fn)!=fn) return (fn-fn)/(fn-fn); 48 if ( fn > (float)65000.0) return scalbnf(x, 65000); 49 if (-fn > (float)65000.0) return scalbnf(x,-65000); 50 return scalbnf(x,(int)fn); 51 #endif 52 } 53