1 /* s_floorf.c -- float version of s_floor.c.
2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
6 * ====================================================
7 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
9 * Developed at SunPro, a Sun Microsystems, Inc. business.
10 * Permission to use, copy, modify, and distribute this
11 * software is freely granted, provided that this notice
13 * ====================================================
15 * $NetBSD: s_floorf.c,v 1.8 2008/04/25 22:21:53 christos Exp $
20 * Return x rounded toward -inf to integral value
24 * Inexact flag raised if x not equal to floorf(x).
28 #include "math_private.h"
30 static const float huge = 1.0e30;
38 jj0 = ((i0>>23)&0xff)-0x7f;
40 if(jj0<0) { /* raise inexact if x != 0 */
41 if(huge+x>(float)0.0) {/* return 0*sign(x) if |x|<1 */
43 else if((i0&0x7fffffff)!=0)
47 i = (0x007fffff)>>jj0;
48 if((i0&i)==0) return x; /* x is integral */
49 if(huge+x>(float)0.0) { /* raise inexact flag */
50 if(i0<0) i0 += (0x00800000)>>jj0;
55 if(jj0==0x80) return x+x; /* inf or NaN */
56 else return x; /* x is integral */