1 /* $FreeBSD: src/lib/libc/alpha/gen/flt_rounds.c,v 1.2 1999/08/27 23:58:08 peter Exp $ */
2 /* $DragonFly: src/lib/libcr/alpha/gen/Attic/flt_rounds.c,v 1.2 2003/06/17 04:26:41 dillon Exp $ */
3 /* From: NetBSD: flt_rounds.c,v 1.2 1997/07/18 00:30:30 thorpej Exp */
6 * Copyright (c) 1995 Christopher G. Demetriou
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed by Christopher G. Demetriou
20 * for the NetBSD Project.
21 * 4. The name of the author may not be used to endorse or promote products
22 * derived from this software without specific prior written permission
24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
27 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
28 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
29 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
30 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
31 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
32 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
33 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 #include <sys/types.h>
37 #include <machine/float.h>
39 static const int map[] = {
40 0, /* round to zero */
41 3, /* round to negative infinity */
42 1, /* round to nearest */
43 2 /* round to positive infinity */
53 __asm__("mf_fpcr %0" : "=f" (fpcrval));
55 old = *(u_int64_t *)&fpcrval;
57 return map[(old >> 58) & 0x3];