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#if defined(LIBM_SCCS) && !defined(lint) 17static char rcsid[] = "$NetBSD: e_scalbf.c,v 1.3 1995/05/10 20:46:12 jtc Exp $"; 18#endif 19 20#include <fenv.h> 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 if (x == 0) 47 return x; 48 else if (!__finitef (x)) 49 { 50# ifdef FE_INVALID 51 feraiseexcept (FE_INVALID); 52# endif 53 return __nanf (""); 54 } 55 else return x/(-fn); 56 } 57 if (__rintf(fn)!=fn) 58 { 59# ifdef FE_INVALID 60 feraiseexcept (FE_INVALID); 61# endif 62 return __nanf (""); 63 } 64 if ( fn > (float)65000.0) return __scalbnf(x, 65000); 65 if (-fn > (float)65000.0) return __scalbnf(x,-65000); 66 return __scalbnf(x,(int)fn); 67#endif 68} 69