1 /* s_ilogbf.c -- float version of s_ilogb.c.
2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
4 * $FreeBSD: src/lib/msun/src/s_ilogbf.c,v 1.5 1999/08/28 00:06:50 peter Exp $
5 * $DragonFly: src/lib/msun/src/Attic/s_ilogbf.c,v 1.4 2004/12/29 17:48:27 asmodai Exp $
9 * ====================================================
10 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
12 * Developed at SunPro, a Sun Microsystems, Inc. business.
13 * Permission to use, copy, modify, and distribute this
14 * software is freely granted, provided that this notice
16 * ====================================================
20 #include "math_private.h"
23 __generic_ilogbf(float x)
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;