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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [gcc/] [cselib.h] - Blame information for rev 749

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1 684 jeremybenn
/* Common subexpression elimination for GNU compiler.
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   Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997,
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   1998, 1999, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
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   Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3.  If not see
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<http://www.gnu.org/licenses/>.  */
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/* Describe a value.  */
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typedef struct cselib_val_struct {
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  /* The hash value.  */
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  unsigned int hash;
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  /* A unique id assigned to values.  */
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  int uid;
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  /* A VALUE rtx that points back to this structure.  */
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  rtx val_rtx;
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  /* All rtl expressions that hold this value at the current time during a
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     scan.  */
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  struct elt_loc_list *locs;
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  /* If this value is used as an address, points to a list of values that
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     use it as an address in a MEM.  */
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  struct elt_list *addr_list;
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  struct cselib_val_struct *next_containing_mem;
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} cselib_val;
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/* A list of rtl expressions that hold the same value.  */
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struct elt_loc_list {
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  /* Next element in the list.  */
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  struct elt_loc_list *next;
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  /* An rtl expression that holds the value.  */
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  rtx loc;
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  /* The insn that made the equivalence.  */
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  rtx setting_insn;
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};
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/* Describe a single set that is part of an insn.  */
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struct cselib_set
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{
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  rtx src;
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  rtx dest;
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  cselib_val *src_elt;
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  cselib_val *dest_addr_elt;
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};
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enum cselib_record_what
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{
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  CSELIB_RECORD_MEMORY = 1,
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  CSELIB_PRESERVE_CONSTANTS = 2
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};
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extern void (*cselib_discard_hook) (cselib_val *);
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extern void (*cselib_record_sets_hook) (rtx insn, struct cselib_set *sets,
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                                        int n_sets);
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extern cselib_val *cselib_lookup (rtx, enum machine_mode,
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                                  int, enum machine_mode);
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extern cselib_val *cselib_lookup_from_insn (rtx, enum machine_mode,
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                                            int, enum machine_mode, rtx);
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extern void cselib_init (int);
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extern void cselib_clear_table (void);
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extern void cselib_finish (void);
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extern void cselib_process_insn (rtx);
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extern enum machine_mode cselib_reg_set_mode (const_rtx);
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extern int rtx_equal_for_cselib_p (rtx, rtx);
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extern int references_value_p (const_rtx, int);
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extern rtx cselib_expand_value_rtx (rtx, bitmap, int);
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typedef rtx (*cselib_expand_callback)(rtx, bitmap, int, void *);
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extern rtx cselib_expand_value_rtx_cb (rtx, bitmap, int,
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                                       cselib_expand_callback, void *);
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extern bool cselib_dummy_expand_value_rtx_cb (rtx, bitmap, int,
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                                              cselib_expand_callback, void *);
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extern rtx cselib_subst_to_values (rtx, enum machine_mode);
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extern rtx cselib_subst_to_values_from_insn (rtx, enum machine_mode, rtx);
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extern void cselib_invalidate_rtx (rtx);
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extern void cselib_reset_table (unsigned int);
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extern unsigned int cselib_get_next_uid (void);
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extern void cselib_preserve_value (cselib_val *);
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extern bool cselib_preserved_value_p (cselib_val *);
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extern void cselib_preserve_only_values (void);
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extern void cselib_preserve_cfa_base_value (cselib_val *, unsigned int);
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extern void cselib_add_permanent_equiv (cselib_val *, rtx, rtx);
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extern void dump_cselib_table (FILE *);
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/* Return the canonical value for VAL, following the equivalence chain
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   towards the earliest (== lowest uid) equivalent value.  */
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static inline cselib_val *
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canonical_cselib_val (cselib_val *val)
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{
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  cselib_val *canon;
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  if (!val->locs || val->locs->next
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      || !val->locs->loc || GET_CODE (val->locs->loc) != VALUE
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      || val->uid < CSELIB_VAL_PTR (val->locs->loc)->uid)
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    return val;
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  canon = CSELIB_VAL_PTR (val->locs->loc);
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  gcc_checking_assert (canonical_cselib_val (canon) == canon);
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  return canon;
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}

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