1 /* s_logbf.c -- float version of s_logb.c.
2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
4 * $FreeBSD: src/lib/msun/src/s_logbf.c,v 1.5 1999/08/28 00:06:53 peter Exp $
5 * $DragonFly: src/lib/msun/src/Attic/s_logbf.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_logbf(float x)
27 ix &= 0x7fffffff; /* high |x| */
28 if(ix==0) return (float)-1.0/fabsf(x);
29 if(ix>=0x7f800000) return x*x;
30 if((ix>>=23)==0) /* IEEE 754 logb */
33 return (float) (ix-127);