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/* $NetBSD: fpsetsticky.c,v 1.1 1995/04/29 05:11:04 cgd Exp $ */
/* $FreeBSD$ */
/*
* Copyright (c) 1995 Christopher G. Demetriou
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Christopher G. Demetriou
* for the NetBSD Project.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/types.h>
#include <ieeefp.h>
#include <machine/fpu.h>
fp_except_t
fpsetsticky(sticky)
fp_except_t sticky;
{
double fpcrval;
u_int64_t old,new ;
GET_FPCR(fpcrval);
old = *(u_int64_t *)&fpcrval;
new = old & ~ (IEEE_STATUS_MASK << IEEE_STATUS_TO_FPCR_SHIFT);
new |= ((sticky << IEEE_STATUS_TO_EXCSUM_SHIFT) & IEEE_STATUS_MASK)
<< IEEE_STATUS_TO_FPCR_SHIFT;
*(u_int64_t *)&fpcrval = new;
SET_FPCR(fpcrval);
return (((old >> IEEE_STATUS_TO_FPCR_SHIFT) & IEEE_STATUS_MASK)
>> IEEE_STATUS_TO_EXCSUM_SHIFT);
}
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