1 /* s_floorf.c -- float version of s_floor.c.
2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
4 * $FreeBSD: src/lib/msun/src/s_floorf.c,v 1.5 1999/08/28 00:06:48 peter Exp $
5 * $DragonFly: src/lib/msun/src/Attic/s_floorf.c,v 1.4 2004/12/29 17:48:27 asmodai Exp $
9 * ====================================================
10 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
12 * Developed at SunPro, a Sun Microsystems, Inc. business.
13 * Permission to use, copy, modify, and distribute this
14 * software is freely granted, provided that this notice
16 * ====================================================
21 * Return x rounded toward -inf to integral value
25 * Inexact flag raised if x not equal to floorf(x).
29 #include "math_private.h"
31 static const float huge = 1.0e30;
34 __generic_floorf(float x)
39 j0 = ((i0>>23)&0xff)-0x7f;
41 if(j0<0) { /* raise inexact if x != 0 */
42 if(huge+x>(float)0.0) {/* return 0*sign(x) if |x|<1 */
44 else if((i0&0x7fffffff)!=0)
49 if((i0&i)==0) return x; /* x is integral */
50 if(huge+x>(float)0.0) { /* raise inexact flag */
51 if(i0<0) i0 += (0x00800000)>>j0;
56 if(j0==0x80) return x+x; /* inf or NaN */
57 else return x; /* x is integral */