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 1.2 2007/01/17 23:24:22 hubertf Exp $
13 * $DragonFly: src/lib/libm/src/s_trunc.c,v 1.1 2007/06/17 06:26:18 pavalos Exp $
18 * Return x rounded toward 0 to integral value
22 * Inexact flag raised if x not equal to trunc(x).
26 #include "math_private.h"
28 static const double huge = 1.0e300;
35 EXTRACT_WORDS(i0,i1,x);
36 j00 = ((i0>>20)&0x7ff)-0x3ff;
38 if(j00<0) { /* raise inexact if x != 0 */
39 if(huge+x>0.0) {/* |x|<1, so return 0*sign(x) */
44 i = (0x000fffff)>>j00;
45 if(((i0&i)|i1)==0) return x; /* x is integral */
46 if(huge+x>0.0) { /* raise inexact flag */
51 if(j00==0x400) return x+x; /* inf or NaN */
52 else return x; /* x is integral */
54 i = ((u_int32_t)(0xffffffff))>>(j00-20);
55 if((i1&i)==0) return x; /* x is integral */
56 if(huge+x>0.0) /* raise inexact flag */
59 INSERT_WORDS(x,i0,i1);