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 * ====================================================
13 #include <sys/cdefs.h>
16 * Return x rounded toward 0 to integral value
20 * Inexact flag raised if x not equal to truncf(x).
24 #include "math_private.h"
26 static const float huge = 1.0e30F;
34 j0 = ((i0>>23)&0xff)-0x7f;
36 if(j0<0) { /* raise inexact if x != 0 */
37 if(huge+x>0.0F) /* |x|<1, so return 0*sign(x) */
41 if((i0&i)==0) return x; /* x is integral */
42 if(huge+x>0.0F) /* raise inexact flag */
46 if(j0==0x80) return x+x; /* inf or NaN */
47 else return x; /* x is integral */