1 /* s_ilogbf.c -- float version of s_ilogb.c.
2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
6 * ====================================================
7 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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
13 * ====================================================
15 * $NetBSD: s_ilogbf.c,v 1.7 2002/05/26 22:01:56 wiz Exp $
16 * $DragonFly: src/lib/libm/src/s_ilogbf.c,v 1.1 2005/07/26 21:15:20 joerg Exp $
20 #include "math_private.h"
31 return 0x80000001; /* ilogb(0) = 0x80000001 */
32 else /* subnormal x */
33 for (ix = -126,hx<<=8; hx>0; hx<<=1) ix -=1;
36 else if (hx<0x7f800000) return (hx>>23)-127;
37 else return 0x7fffffff;