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fpgetround.c revision 1.4
      1  1.4     matt /*	$NetBSD: fpgetround.c,v 1.4 2004/04/02 22:55:19 matt Exp $	*/
      2  1.1     danw 
      3  1.1     danw /*
      4  1.1     danw  * Copyright (c) 1999 The NetBSD Foundation, Inc.
      5  1.1     danw  * All rights reserved.
      6  1.1     danw  *
      7  1.1     danw  * This code is derived from software contributed to The NetBSD Foundation
      8  1.1     danw  * by Dan Winship.
      9  1.1     danw  *
     10  1.1     danw  * Redistribution and use in source and binary forms, with or without
     11  1.1     danw  * modification, are permitted provided that the following conditions
     12  1.1     danw  * are met:
     13  1.1     danw  * 1. Redistributions of source code must retain the above copyright
     14  1.1     danw  *    notice, this list of conditions and the following disclaimer.
     15  1.1     danw  * 2. Redistributions in binary form must reproduce the above copyright
     16  1.1     danw  *    notice, this list of conditions and the following disclaimer in the
     17  1.1     danw  *    documentation and/or other materials provided with the distribution.
     18  1.1     danw  * 3. All advertising materials mentioning features or use of this software
     19  1.1     danw  *    must display the following acknowledgement:
     20  1.1     danw  *	This product includes software developed by the NetBSD
     21  1.1     danw  *	Foundation, Inc. and its contributors.
     22  1.1     danw  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  1.1     danw  *    contributors may be used to endorse or promote products derived
     24  1.1     danw  *    from this software without specific prior written permission.
     25  1.1     danw  *
     26  1.1     danw  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  1.1     danw  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  1.1     danw  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  1.1     danw  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  1.1     danw  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  1.1     danw  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  1.1     danw  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  1.1     danw  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  1.1     danw  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  1.1     danw  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  1.1     danw  * POSSIBILITY OF SUCH DAMAGE.
     37  1.1     danw  */
     38  1.1     danw 
     39  1.3  thorpej #include <sys/cdefs.h>
     40  1.3  thorpej 
     41  1.3  thorpej #include "namespace.h"
     42  1.3  thorpej 
     43  1.1     danw #include <sys/types.h>
     44  1.1     danw #include <ieeefp.h>
     45  1.4     matt #include <powerpc/fpu.h>
     46  1.3  thorpej 
     47  1.3  thorpej #ifdef __weak_alias
     48  1.3  thorpej __weak_alias(fpgetround,_fpgetround)
     49  1.3  thorpej #endif
     50  1.1     danw 
     51  1.4     matt #define	ROUNDBITS	FPSCR_RN
     52  1.4     matt #define	ROUNDSHFT	0
     53  1.4     matt 
     54  1.1     danw fp_rnd
     55  1.1     danw fpgetround()
     56  1.1     danw {
     57  1.1     danw 	u_int64_t fpscr;
     58  1.1     danw 
     59  1.1     danw 	__asm__ __volatile("mffs %0" : "=f"(fpscr));
     60  1.4     matt 	return (((fp_rnd)fpscr & ROUNDBITS) >> ROUNDSHFT);
     61  1.1     danw }
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