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 1.7 2002/05/26 22:01:56 wiz Exp $
16 * $DragonFly: src/lib/libm/src/s_floorf.c,v 1.1 2005/07/26 21:15:20 joerg Exp $
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
;
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 */