annotate gcc/lower-subreg.h @ 16:04ced10e8804

gcc 7
author kono
date Fri, 27 Oct 2017 22:46:09 +0900
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children 84e7813d76e9
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1 /* Target-dependent costs for lower-subreg.c.
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2 Copyright (C) 2012-2017 Free Software Foundation, Inc.
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3
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4 This file is part of GCC.
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5
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6 GCC is free software; you can redistribute it and/or modify it under
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7 the terms of the GNU General Public License as published by the Free
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8 Software Foundation; either version 3, or (at your option) any later
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9 version.
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10
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11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with GCC; see the file COPYING3. If not see
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18 <http://www.gnu.org/licenses/>. */
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19
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20 #ifndef LOWER_SUBREG_H
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21 #define LOWER_SUBREG_H 1
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22
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23 /* Information about whether, and where, lower-subreg should be applied. */
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24 struct lower_subreg_choices {
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25 /* A boolean vector for move splitting that is indexed by mode and is
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26 true for each mode that is to have its copies split. */
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27 bool move_modes_to_split[MAX_MACHINE_MODE];
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28
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29 /* True if zero-extensions from word_mode to twice_word_mode should
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30 be split. */
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31 bool splitting_zext;
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32
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33 /* Index X is true if twice_word_mode shifts by X + BITS_PER_WORD
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34 should be split. */
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35 bool splitting_ashift[MAX_BITS_PER_WORD];
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36 bool splitting_lshiftrt[MAX_BITS_PER_WORD];
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37 bool splitting_ashiftrt[MAX_BITS_PER_WORD];
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38
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39 /* True if there is at least one mode that is worth splitting. */
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40 bool something_to_do;
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41 };
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42
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43 /* Target-specific information for the subreg lowering pass. */
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44 struct target_lower_subreg {
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45 /* An integer mode that is twice as wide as word_mode. */
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46 scalar_int_mode_pod x_twice_word_mode;
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47
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48 /* What we have decided to do when optimizing for size (index 0)
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49 and speed (index 1). */
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50 struct lower_subreg_choices x_choices[2];
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51 };
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52
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53 extern struct target_lower_subreg default_target_lower_subreg;
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54 #if SWITCHABLE_TARGET
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55 extern struct target_lower_subreg *this_target_lower_subreg;
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56 #else
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57 #define this_target_lower_subreg (&default_target_lower_subreg)
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58 #endif
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59
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60 #endif