/* e_scalbf.c -- float version of e_scalb.c. * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. */ /* * ==================================================== * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. * * Developed at SunPro, a Sun Microsystems, Inc. business. * Permission to use, copy, modify, and distribute this * software is freely granted, provided that this notice * is preserved. * ==================================================== */ #if defined(LIBM_SCCS) && !defined(lint) static char rcsid[] = "$NetBSD: e_scalbf.c,v 1.3 1995/05/10 20:46:12 jtc Exp $"; #endif #include #include #include "math_private.h" #ifdef _SCALB_INT #ifdef __STDC__ float __ieee754_scalbf(float x, int fn) #else float __ieee754_scalbf(x,fn) float x; int fn; #endif #else #ifdef __STDC__ float __ieee754_scalbf(float x, float fn) #else float __ieee754_scalbf(x,fn) float x, fn; #endif #endif { #ifdef _SCALB_INT return __scalbnf(x,fn); #else if (__isnanf(x)||__isnanf(fn)) return x*fn; if (!__finitef(fn)) { if(fn>(float)0.0) return x*fn; else if (x == 0) return x; else if (!__finitef (x)) { # ifdef FE_INVALID feraiseexcept (FE_INVALID); # endif return __nanf (""); } else return x/(-fn); } if (__rintf(fn)!=fn) { # ifdef FE_INVALID feraiseexcept (FE_INVALID); # endif return __nanf (""); } if ( fn > (float)65000.0) return __scalbnf(x, 65000); if (-fn > (float)65000.0) return __scalbnf(x,-65000); return __scalbnf(x,(int)fn); #endif }