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, Version 1.0 only
6 * (the "License"). You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22 #pragma ident "%Z%%M% %I% %E% SMI"
23
24 /*
25 * Copyright (c) 1988 by Sun Microsystems, Inc.
26 */
27
28 #include "_Qquad.h"
29 #include "_Qglobals.h"
30
31 enum fcc_type
_fp_compare(px,py,strict)32 _fp_compare(px, py, strict)
33 unpacked *px, *py;
34 int strict; /* 0 if quiet NaN unexceptional, 1 if
35 * exceptional */
36
37 {
38 enum fcc_type cc;
39 int k,n;
40
41 if ((px->fpclass == fp_quiet) || (py->fpclass == fp_quiet) ||
42 (px->fpclass == fp_signaling) || (py->fpclass == fp_signaling)) {
43 if (strict) /* NaN */
44 fpu_set_exception(fp_invalid);
45 cc = fcc_unordered;
46 } else if ((px->fpclass == fp_zero) && (py->fpclass == fp_zero))
47 cc = fcc_equal;
48 /* both zeros */
49 else if (px->sign < py->sign)
50 cc = fcc_greater;
51 else if (px->sign > py->sign)
52 cc = fcc_less;
53 else { /* signs the same, compute magnitude cc */
54 if ((int) px->fpclass > (int) py->fpclass)
55 cc = fcc_greater;
56 else if ((int) px->fpclass < (int) py->fpclass)
57 cc = fcc_less;
58 else
59 /* same classes */ if (px->fpclass == fp_infinity)
60 cc = fcc_equal; /* same infinity */
61 else if (px->exponent > py->exponent)
62 cc = fcc_greater;
63 else if (px->exponent < py->exponent)
64 cc = fcc_less;
65 else { /* equal exponents */
66 n = fpu_cmpli(px->significand,py->significand,4);
67 if(n>0) cc = fcc_greater;
68 else if(n<0) cc = fcc_less;
69 else cc = fcc_equal;
70 }
71 if (px->sign)
72 switch (cc) { /* negative numbers */
73 case fcc_less:
74 cc = fcc_greater;
75 break;
76 case fcc_greater:
77 cc = fcc_less;
78 break;
79 }
80 }
81 return (cc);
82 }
83