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 * ====================================================
16 #if defined(LIBM_SCCS) && !defined(lint)
17 static char rcsid
[] = "$NetBSD: s_ilogbf.c,v 1.4 1995/05/10 20:47:31 jtc Exp $";
22 #include <math_private.h>
24 int __ieee754_ilogbf(float x
)
32 return FP_ILOGB0
; /* ilogb(0) = FP_ILOGB0 */
33 else /* subnormal x */
34 for (ix
= -126,hx
<<=8; hx
>0; hx
<<=1) ix
-=1;
37 else if (hx
<0x7f800000) return (hx
>>23)-127;
38 else if (FP_ILOGBNAN
!= INT_MAX
) {
39 /* ISO C99 requires ilogbf(+-Inf) == INT_MAX. */