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File: [cvs.NetBSD.org] / src / lib / libm / src / s_floorf.c (download)

Revision 1.6, Fri Jul 2 15:37:42 1999 UTC (24 years, 9 months ago) by simonb
Branch: MAIN
CVS Tags: wrstuden-devbsize-base, wrstuden-devbsize-19991221, wrstuden-devbsize, netbsd-1-6-base, netbsd-1-6-RELEASE, netbsd-1-6-RC3, netbsd-1-6-RC2, netbsd-1-6-RC1, netbsd-1-6-PATCH002-RELEASE, netbsd-1-6-PATCH002-RC4, netbsd-1-6-PATCH002-RC3, netbsd-1-6-PATCH002-RC2, netbsd-1-6-PATCH002-RC1, netbsd-1-6-PATCH002, netbsd-1-6-PATCH001-RELEASE, netbsd-1-6-PATCH001-RC3, netbsd-1-6-PATCH001-RC2, netbsd-1-6-PATCH001-RC1, netbsd-1-6-PATCH001, netbsd-1-6, netbsd-1-5-base, netbsd-1-5-RELEASE, netbsd-1-5-PATCH003, netbsd-1-5-PATCH002, netbsd-1-5-PATCH001, netbsd-1-5-BETA2, netbsd-1-5-BETA, netbsd-1-5-ALPHA2, netbsd-1-5, minoura-xpg4dl-base, minoura-xpg4dl, comdex-fall-1999-base, comdex-fall-1999
Changes since 1.5: +3 -3 lines 

More trailing white space.

/* s_floorf.c -- float version of s_floor.c.
 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
 */

/*
 * ====================================================
 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
 *
 * Developed at SunPro, a Sun Microsystems, Inc. business.
 * Permission to use, copy, modify, and distribute this
 * software is freely granted, provided that this notice
 * is preserved.
 * ====================================================
 */

#include <sys/cdefs.h>
#if defined(LIBM_SCCS) && !defined(lint)
__RCSID("$NetBSD: s_floorf.c,v 1.6 1999/07/02 15:37:42 simonb Exp $");
#endif

/*
 * floorf(x)
 * Return x rounded toward -inf to integral value
 * Method:
 *	Bit twiddling.
 * Exception:
 *	Inexact flag raised if x not equal to floorf(x).
 */

#include "math.h"
#include "math_private.h"

#ifdef __STDC__
static const float huge = 1.0e30;
#else
static float huge = 1.0e30;
#endif

#ifdef __STDC__
	float floorf(float x)
#else
	float floorf(x)
	float x;
#endif
{
	int32_t i0,j0;
	u_int32_t i;
	GET_FLOAT_WORD(i0,x);
	j0 = ((i0>>23)&0xff)-0x7f;
	if(j0<23) {
	    if(j0<0) { 	/* raise inexact if x != 0 */
		if(huge+x>(float)0.0) {/* return 0*sign(x) if |x|<1 */
		    if(i0>=0) {i0=0;}
		    else if((i0&0x7fffffff)!=0)
			{ i0=0xbf800000;}
		}
	    } else {
		i = (0x007fffff)>>j0;
		if((i0&i)==0) return x; /* x is integral */
		if(huge+x>(float)0.0) {	/* raise inexact flag */
		    if(i0<0) i0 += (0x00800000)>>j0;
		    i0 &= (~i);
		}
	    }
	} else {
	    if(j0==0x80) return x+x;	/* inf or NaN */
	    else return x;		/* x is integral */
	}
	SET_FLOAT_WORD(x,i0);
	return x;
}