1 /* s_logbf.c -- float version of s_logb.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 * $FreeBSD: head/lib/msun/src/s_logbf.c 176451 2008-02-22 02:30:36Z das $
19 #include "math_private.h"
22 two25 = 3.355443200e+07; /* 0x4c000000 */
29 ix &= 0x7fffffff; /* high |x| */
30 if(ix==0) return (float)-1.0/fabsf(x);
31 if(ix>=0x7f800000) return x*x;
33 x *= two25; /* convert subnormal x to normal */
36 return (float) ((ix>>23)-127-25);
38 return (float) ((ix>>23)-127);