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1 /* Common subexpression elimination for GNU compiler.
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2 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
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3 1999, 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
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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 it under
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8 the terms of the GNU General Public License as published by the Free
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9 Software Foundation; either version 3, or (at your option) any later
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10 version.
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11
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12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 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 /* Describe a value. */
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22 typedef struct cselib_val_struct GTY(())
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23 {
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24 /* The hash value. */
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25 unsigned int value;
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26
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27 /* A VALUE rtx that points back to this structure. */
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28 rtx val_rtx;
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29
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30 /* All rtl expressions that hold this value at the current time during a
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31 scan. */
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32 struct elt_loc_list *locs;
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33
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34 /* If this value is used as an address, points to a list of values that
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35 use it as an address in a MEM. */
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36 struct elt_list *addr_list;
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37
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38 struct cselib_val_struct *next_containing_mem;
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39 } cselib_val;
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40
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41 /* A list of rtl expressions that hold the same value. */
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42 struct elt_loc_list GTY(())
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43 {
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44 /* Next element in the list. */
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45 struct elt_loc_list *next;
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46 /* An rtl expression that holds the value. */
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47 rtx loc;
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48 /* The insn that made the equivalence. */
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49 rtx setting_insn;
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50 };
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51
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52 /* A list of cselib_val structures. */
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53 struct elt_list GTY(())
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54 {
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55 struct elt_list *next;
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56 cselib_val *elt;
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57 };
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58
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59 extern void (*cselib_discard_hook) (cselib_val *);
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60
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61 extern cselib_val *cselib_lookup (rtx, enum machine_mode, int);
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62 extern void cselib_init (bool record_memory);
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63 extern void cselib_clear_table (void);
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64 extern void cselib_finish (void);
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65 extern void cselib_process_insn (rtx);
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66 extern enum machine_mode cselib_reg_set_mode (const_rtx);
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67 extern int rtx_equal_for_cselib_p (rtx, rtx);
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68 extern int references_value_p (const_rtx, int);
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69 extern rtx cselib_expand_value_rtx (rtx, bitmap, int);
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70 extern rtx cselib_subst_to_values (rtx);
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71 extern void cselib_invalidate_rtx (rtx);
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