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