xref: /illumos-gate/usr/src/lib/libc/sparc/fp/fpsetrnd.s (revision 9a70fc3b)
1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22/*
23 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
24 * Use is subject to license terms.
25 */
26
27/*	Copyright (c) 1988 AT&T	*/
28/*	  All Rights Reserved	*/
29
30	.file	"fpsetrnd.s"
31
32#include "SYS.h"
33
34	ANSI_PRAGMA_WEAK(fpsetround,function)
35
36	ENTRY(fpsetround)
37	add	%sp, -SA(MINFRAME), %sp	! get an additional word of storage
38	set	0xc0000000, %o4		! mask of round control bits
39	sll	%o0, 30, %o1		! move input bits into position
40	st	%fsr, [%sp+ARGPUSH]	! get fsr value
41	ld	[%sp+ARGPUSH], %o0	! load into register
42	and	%o1, %o4, %o1		! generate new fsr value
43	andn	%o0, %o4, %o2
44	or	%o1, %o2, %o1
45	st	%o1, [%sp+ARGPUSH]	! move new fsr value to memory
46	ld	[%sp+ARGPUSH], %fsr	! load fsr with new value
47	srl	%o0, 30, %o0		! return old round control value
48	retl
49	add	%sp, SA(MINFRAME), %sp	! reclaim stack space
50
51	SET_SIZE(fpsetround)
52