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 #if defined(LIBM_SCCS) && !defined(lint) 18 __RCSID("$NetBSD: e_scalbf.c,v 1.4 1997/10/09 11:29:56 lukem Exp $"); 19 #endif 20 21 #include "math.h" 22 #include "math_private.h" 23 24 #ifdef _SCALB_INT 25 #ifdef __STDC__ 26 float __ieee754_scalbf(float x, int fn) 27 #else 28 float __ieee754_scalbf(x,fn) 29 float x; int fn; 30 #endif 31 #else 32 #ifdef __STDC__ 33 float __ieee754_scalbf(float x, float fn) 34 #else 35 float __ieee754_scalbf(x,fn) 36 float x, fn; 37 #endif 38 #endif 39 { 40 #ifdef _SCALB_INT 41 return scalbnf(x,fn); 42 #else 43 if (isnanf(x)||isnanf(fn)) return x*fn; 44 if (!finitef(fn)) { 45 if(fn>(float)0.0) return x*fn; 46 else return x/(-fn); 47 } 48 if (rintf(fn)!=fn) return (fn-fn)/(fn-fn); 49 if ( fn > (float)65000.0) return scalbnf(x, 65000); 50 if (-fn > (float)65000.0) return scalbnf(x,-65000); 51 return scalbnf(x,(int)fn); 52 #endif 53 } 54