Annotation of sys/arch/m68k/fpe/fpu_getexp.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: fpu_getexp.c,v 1.3 2006/06/11 20:43:28 miod Exp $ */
2: /* $NetBSD: fpu_getexp.c,v 1.1 1995/11/03 04:47:11 briggs Exp $ */
3:
4: /*
5: * Copyright (c) 1995 Ken Nakata
6: * All rights reserved.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: * 3. Neither the name of the author nor the names of its contributors
17: * may be used to endorse or promote products derived from this software
18: * without specific prior written permission.
19: *
20: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30: * SUCH DAMAGE.
31: *
32: * @(#)fpu_getexp.c 10/8/95
33: */
34:
35: #include <sys/types.h>
36:
37: #include <m68k/fpe/fpu_emulate.h>
38:
39: struct fpn *
40: fpu_getexp(fe)
41: struct fpemu *fe;
42: {
43: struct fpn *fp = &fe->fe_f2;
44:
45: fe->fe_fpsr &= ~FPSR_EXCP; /* clear all exceptions */
46:
47: if (fp->fp_class == FPC_INF) {
48: fp = fpu_newnan(fe);
49: fe->fe_fpsr |= FPSR_OPERR;
50: } else if (fp->fp_class == FPC_NUM) { /* a number */
51: fpu_explode(fe, &fe->fe_f3, FTYPE_LNG, &fp->fp_exp);
52: fp = &fe->fe_f3;
53: } else if (fp->fp_class == FPC_SNAN) { /* signaling NaN */
54: fe->fe_fpsr |= FPSR_SNAN;
55: } /* else if fp == zero or fp == quiet NaN, return itself */
56: return fp;
57: }
58:
59: struct fpn *
60: fpu_getman(fe)
61: struct fpemu *fe;
62: {
63: struct fpn *fp = &fe->fe_f2;
64:
65: fe->fe_fpsr &= ~FPSR_EXCP; /* clear all exceptions */
66:
67: if (fp->fp_class == FPC_INF) {
68: fp = fpu_newnan(fe);
69: fe->fe_fpsr |= FPSR_OPERR;
70: } else if (fp->fp_class == FPC_NUM) { /* a number */
71: fp->fp_exp = 0;
72: } else if (fp->fp_class == FPC_SNAN) { /* signaling NaN */
73: fe->fe_fpsr |= FPSR_SNAN;
74: } /* else if fp == zero or fp == quiet NaN, return itself */
75: return fp;
76: }
77:
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