1 /* e_scalbf.c -- float version of e_scalb.c. 2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian (at) 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 __FBSDID("$FreeBSD$"); 18 19 #include "math.h" 20 #include "math_private.h" 21 22 #ifdef _SCALB_INT 23 float 24 __ieee754_scalbf(float x, int fn) 25 #else 26 float 27 __ieee754_scalbf(float x, float fn) 28 #endif 29 { 30 #ifdef _SCALB_INT 31 return scalbnf(x,fn); 32 #else 33 if ((isnanf)(x)||(isnanf)(fn)) return x*fn; 34 if (!finitef(fn)) { 35 if(fn>(float)0.0) return x*fn; 36 else return x/(-fn); 37 } 38 if (rintf(fn)!=fn) return (fn-fn)/(fn-fn); 39 if ( fn > (float)65000.0) return scalbnf(x, 65000); 40 if (-fn > (float)65000.0) return scalbnf(x,-65000); 41 return scalbnf(x,(int)fn); 42 #endif 43 } 44
