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1 /* Definitions of target machine for GNU compiler, for the pdp-11
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2 Copyright (C) 2002-2018 Free Software Foundation, Inc.
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3 Contributed by Michael K. Gschwind (mike@vlsivie.tuwien.ac.at).
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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 /* Add any extra modes needed to represent the condition code.
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22
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23 The default CCmode is the CPU condition codes, as set by compare;
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24 all conditional branches are valid with this.
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25
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26 CCNZmode is the CPU condition code as a side effect of arithmetic
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27 or logic operations where N and Z reflect sign and zero status of
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28 the result, but the V bit is not meaningful. Unsigned conditional
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29 branches don't apply then (no such thing when comparing with zero)
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30 and signed branches that use V need to clear V first if they are to
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31 be used. CCNZ mode appears in side effects (implicit compare with
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32 zero) if V is not forced to 0 by the instruction. In such cases, V
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33 often reflects signed overflow of the operation, which means a
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34 signed branch will get the sign backwards. This applies both to
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35 some float and integer operations.
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36
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37 These modes are used both in the FPU and the CPU, since they have
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38 the same meaning, and also because the FPU condition codes are
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39 copied to the CPU before being used in conditional branches. */
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40
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41 CC_MODE (CCNZ);
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42
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43 RESET_FLOAT_FORMAT (SF, pdp11_f_format);
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44 RESET_FLOAT_FORMAT (DF, pdp11_d_format);
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