1 /* @(#)s_floor.c 5.1 93/09/24 */
2 /* $FreeBSD: head/lib/msun/src/s_trunc.c 176450 2008-02-22 02:27:34Z das $ */
4 * ====================================================
5 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
7 * Developed at SunPro, a Sun Microsystems, Inc. business.
8 * Permission to use, copy, modify, and distribute this
9 * software is freely granted, provided that this notice
11 * ====================================================
16 * Return x rounded toward 0 to integral value
20 * 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 j0 = ((i0>>20)&0x7ff)-0x3ff;
38 if(j0<0) { /* raise inexact if x != 0 */
39 if(huge+x>0.0) {/* |x|<1, so return 0*sign(x) */
45 if(((i0&i)|i1)==0) return x; /* x is integral */
46 if(huge+x>0.0) { /* raise inexact flag */
51 if(j0==0x400) return x+x; /* inf or NaN */
52 else return x; /* x is integral */
54 i = ((u_int32_t)(0xffffffff))>>(j0-20);
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);
63 #if LDBL_MANT_DIG == 53
64 __weak_reference(trunc, truncl);