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 "math.h" 17 #include "math_private.h" 18 19 #ifdef _SCALB_INT 20 float 21 scalbf(float x, int fn) 22 { 23 return scalbnf(x,fn); 24 } 25 DEF_NONSTD(scalbf); 26 27 #else 28 29 float 30 scalbf(float x, float fn) 31 { 32 if (isnan(x)||isnan(fn)) return x*fn; 33 if (!isfinite(fn)) { 34 if(fn>(float)0.0) return x*fn; 35 else return x/(-fn); 36 } 37 if (rintf(fn)!=fn) return (fn-fn)/(fn-fn); 38 if ( fn > (float)65000.0) return scalbnf(x, 65000); 39 if (-fn > (float)65000.0) return scalbnf(x,-65000); 40 return scalbnf(x,(int)fn); 41 } 42 DEF_NONSTD(scalbf); 43 #endif 44