1*0a6a1f1dSLionel Sambuc /* $NetBSD: flt_rounds.c,v 1.2 2015/03/19 21:22:59 joerg Exp $ */
2*0a6a1f1dSLionel Sambuc
3*0a6a1f1dSLionel Sambuc /*
4*0a6a1f1dSLionel Sambuc * Copyright (c) 1996 Mark Brinicombe
5*0a6a1f1dSLionel Sambuc * All rights reserved.
6*0a6a1f1dSLionel Sambuc *
7*0a6a1f1dSLionel Sambuc * Redistribution and use in source and binary forms, with or without
8*0a6a1f1dSLionel Sambuc * modification, are permitted provided that the following conditions
9*0a6a1f1dSLionel Sambuc * are met:
10*0a6a1f1dSLionel Sambuc * 1. Redistributions of source code must retain the above copyright
11*0a6a1f1dSLionel Sambuc * notice, this list of conditions and the following disclaimer.
12*0a6a1f1dSLionel Sambuc * 2. Redistributions in binary form must reproduce the above copyright
13*0a6a1f1dSLionel Sambuc * notice, this list of conditions and the following disclaimer in the
14*0a6a1f1dSLionel Sambuc * documentation and/or other materials provided with the distribution.
15*0a6a1f1dSLionel Sambuc * 3. All advertising materials mentioning features or use of this software
16*0a6a1f1dSLionel Sambuc * must display the following acknowledgement:
17*0a6a1f1dSLionel Sambuc * This product includes software developed by Mark Brinicombe
18*0a6a1f1dSLionel Sambuc * for the NetBSD Project.
19*0a6a1f1dSLionel Sambuc * 4. The name of the author may not be used to endorse or promote products
20*0a6a1f1dSLionel Sambuc * derived from this software without specific prior written permission
21*0a6a1f1dSLionel Sambuc *
22*0a6a1f1dSLionel Sambuc * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
23*0a6a1f1dSLionel Sambuc * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24*0a6a1f1dSLionel Sambuc * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25*0a6a1f1dSLionel Sambuc * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
26*0a6a1f1dSLionel Sambuc * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
27*0a6a1f1dSLionel Sambuc * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28*0a6a1f1dSLionel Sambuc * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29*0a6a1f1dSLionel Sambuc * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30*0a6a1f1dSLionel Sambuc * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
31*0a6a1f1dSLionel Sambuc * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32*0a6a1f1dSLionel Sambuc */
33*0a6a1f1dSLionel Sambuc
34*0a6a1f1dSLionel Sambuc #include <sys/cdefs.h>
35*0a6a1f1dSLionel Sambuc #if defined(LIBC_SCCS) && !defined(lint)
36*0a6a1f1dSLionel Sambuc __RCSID("$NetBSD: flt_rounds.c,v 1.2 2015/03/19 21:22:59 joerg Exp $");
37*0a6a1f1dSLionel Sambuc #endif /* LIBC_SCCS and not lint */
38*0a6a1f1dSLionel Sambuc
39*0a6a1f1dSLionel Sambuc #include "namespace.h"
40*0a6a1f1dSLionel Sambuc #include <ieeefp.h>
41*0a6a1f1dSLionel Sambuc #include <float.h>
42*0a6a1f1dSLionel Sambuc #include <stdint.h>
43*0a6a1f1dSLionel Sambuc #include <machine/ieeefp.h>
44*0a6a1f1dSLionel Sambuc
45*0a6a1f1dSLionel Sambuc static const int rounding_map =
46*0a6a1f1dSLionel Sambuc (1 << (FP_RN * 2)) /* round to nearest */
47*0a6a1f1dSLionel Sambuc | (0 << (FP_RZ * 2)) /* round to zero */
48*0a6a1f1dSLionel Sambuc | (2 << (FP_RP * 2)) /* round to positive infinity */
49*0a6a1f1dSLionel Sambuc | (3 << (FP_RM * 2)); /* round to negative infinity */
50*0a6a1f1dSLionel Sambuc
51*0a6a1f1dSLionel Sambuc int
__flt_rounds(void)52*0a6a1f1dSLionel Sambuc __flt_rounds(void)
53*0a6a1f1dSLionel Sambuc {
54*0a6a1f1dSLionel Sambuc return (rounding_map >> (fpgetround() * 2)) & 3;
55*0a6a1f1dSLionel Sambuc }
56