comparison gcc/config/mmix/mmix-modes.def @ 0:a06113de4d67

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author kent <kent@cr.ie.u-ryukyu.ac.jp>
date Fri, 17 Jul 2009 14:47:48 +0900
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1 /* Definitions of target machine for GNU compiler, for MMIX.
2 Copyright (C) 2002, 2004, 2007 Free Software Foundation, Inc.
3 Contributed by Hans-Peter Nilsson (hp@bitrange.com)
4
5 This file is part of GCC.
6
7 GCC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3, or (at your option)
10 any later version.
11
12 GCC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
20
21 /* Node: Condition Code */
22
23 /* Like other non-CC0 ports, MMIX need to code which combination of
24 comparison insn and branch insn or conditional-set insn to use into the
25 condition mode. The CC mode depends partly on which condition is used
26 and partly on the type of the operands. */
27
28 /* The "usual" CC mode is used for a signed operands integer comparison,
29 where the CMP insn is used and the result is (integer) -1, 0 or 1 for
30 respectively a < b, a == b and a > b. */
31
32 /* The CC_UNS mode is for an unsigned operands integer comparison using
33 the CMPU insn. Result values correspond to those in CCmode. */
34 CC_MODE (CC_UNS);
35
36 /* The CC_FP mode is for a non-equality floating-point comparison, using
37 the FCMP or FCMPE insn. The result is (integer) -1 or 1 for
38 respectively a < b and a > b, otherwise 0. */
39 CC_MODE (CC_FP);
40
41 /* The CC_FPEQ mode is for an equality floating-point comparison, using
42 the FEQL or FEQLE insn. The result is (integer) 1 for a == b,
43 otherwise 0 (including NaN:s). */
44 CC_MODE (CC_FPEQ);
45
46 /* The CC_FUN mode is for an ordering comparison, using the FUN or FUNE
47 insn. The result is (integer) 1 if a is unordered to b, otherwise the
48 result is 0. */
49 CC_MODE (CC_FUN);