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_trunc.c,v 1.3 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 trunc(x).
25 #include "math_private.h"
27 static const double huge = 1.0e300;
34 EXTRACT_WORDS(i0,i1,x);
35 jj0 = ((i0>>20)&0x7ff)-0x3ff;
37 if(jj0<0) { /* raise inexact if x != 0 */
38 if(huge+x>0.0) {/* |x|<1, so return 0*sign(x) */
43 i = (0x000fffff)>>jj0;
44 if(((i0&i)|i1)==0) return x; /* x is integral */
45 if(huge+x>0.0) { /* raise inexact flag */
50 if(jj0==0x400) return x+x; /* inf or NaN */
51 else return x; /* x is integral */
53 i = ((u_int32_t)(0xffffffff))>>(jj0-20);
54 if((i1&i)==0) return x; /* x is integral */
55 if(huge+x>0.0) /* raise inexact flag */
58 INSERT_WORDS(x,i0,i1);