1 /* @(#)s_floor.c 5.1 93/09/24 */
3 * ====================================================
4 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
6 * Developed at SunPro, a Sun Microsystems, Inc. business.
7 * Permission to use, copy, modify, and distribute this
8 * software is freely granted, provided that this notice
10 * ====================================================
12 * $NetBSD: s_truncf.c,v 1.4 2008/04/25 22:21:53 christos Exp $
17 * Return x rounded toward 0 to integral value
21 * Inexact flag raised if x not equal to truncf(x).
25 #include "math_private.h"
27 static const float huge = 1.0e30F;
35 jj0 = ((i0>>23)&0xff)-0x7f;
37 if(jj0<0) { /* raise inexact if x != 0 */
38 if(huge+x>0.0F) /* |x|<1, so return 0*sign(x) */
41 i = (0x007fffff)>>jj0;
42 if((i0&i)==0) return x; /* x is integral */
43 if(huge+x>0.0F) /* raise inexact flag */
47 if(jj0==0x80) return x+x; /* inf or NaN */
48 else return x; /* x is integral */