fpgetround.c revision 1.3 
11.3Scgd/* $NetBSD: fpgetround.c,v 1.3 2000/06/14 17:24:58 cgd Exp $ */
21.1Scgd
31.1Scgd/*
41.1Scgd * Copyright (c) 1995 Christopher G. Demetriou
51.1Scgd * All rights reserved.
61.3Scgd *
71.1Scgd * Redistribution and use in source and binary forms, with or without
81.1Scgd * modification, are permitted provided that the following conditions
91.1Scgd * are met:
101.1Scgd * 1. Redistributions of source code must retain the above copyright
111.1Scgd *    notice, this list of conditions and the following disclaimer.
121.1Scgd * 2. Redistributions in binary form must reproduce the above copyright
131.1Scgd *    notice, this list of conditions and the following disclaimer in the
141.1Scgd *    documentation and/or other materials provided with the distribution.
151.1Scgd * 3. All advertising materials mentioning features or use of this software
161.1Scgd *    must display the following acknowledgement:
171.3Scgd *          This product includes software developed for the
181.3Scgd *          NetBSD Project.  See http://www.netbsd.org/ for
191.3Scgd *          information about NetBSD.
201.1Scgd * 4. The name of the author may not be used to endorse or promote products
211.3Scgd *    derived from this software without specific prior written permission.
221.3Scgd *
231.1Scgd * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
241.1Scgd * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
251.1Scgd * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
261.1Scgd * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
271.1Scgd * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
281.1Scgd * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
291.1Scgd * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
301.1Scgd * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
311.1Scgd * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
321.1Scgd * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
331.3Scgd *
341.3Scgd * <<Id: LICENSE,v 1.2 2000/06/14 15:57:33 cgd Exp>>
351.1Scgd */
361.1Scgd
371.1Scgd#include <sys/types.h>
381.1Scgd#include <ieeefp.h>
391.1Scgd
401.1Scgdfp_rnd
411.1Scgdfpgetround()
421.1Scgd{
431.1Scgd	double fpcrval;
441.1Scgd	u_int64_t old;
451.1Scgd
461.1Scgd	__asm__("trapb");
471.1Scgd	__asm__("mf_fpcr %0" : "=f" (fpcrval));
481.1Scgd	__asm__("trapb");
491.1Scgd	old = *(u_int64_t *)&fpcrval;
501.1Scgd
511.1Scgd	return ((old >> 58) & 0x3);
521.1Scgd}
53