Initial checkin of GCC 4.9.0 from trunk (r208799).

Change-Id: I48a3c08bb98542aa215912a75f03c0890e497dba

1 files changed, 122 insertions, 0 deletions

diff --git a/gcc-4.9/gcc/cselib.h b/gcc-4.9/gcc/cselib.h
new file mode 100644
index 000000000..785f3b6d2
--- /dev/null
+++ b/gcc-4.9/gcc/cselib.h
@@ -0,0 +1,122 @@
+/* Common subexpression elimination for GNU compiler.
+   Copyright (C) 1987-2014 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 3, or (at your option) any later
+version.
+
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+/* Describe a value.  */
+struct cselib_val {
+  /* The hash value.  */
+  unsigned int hash;
+
+  /* A unique id assigned to values.  */
+  int uid;
+
+  /* A VALUE rtx that points back to this structure.  */
+  rtx val_rtx;
+
+  /* All rtl expressions that hold this value at the current time during a
+     scan.  */
+  struct elt_loc_list *locs;
+
+  /* If this value is used as an address, points to a list of values that
+     use it as an address in a MEM.  */
+  struct elt_list *addr_list;
+
+  struct cselib_val *next_containing_mem;
+};
+
+/* A list of rtl expressions that hold the same value.  */
+struct elt_loc_list {
+  /* Next element in the list.  */
+  struct elt_loc_list *next;
+  /* An rtl expression that holds the value.  */
+  rtx loc;
+  /* The insn that made the equivalence.  */
+  rtx setting_insn;
+};
+
+/* Describe a single set that is part of an insn.  */
+struct cselib_set
+{
+  rtx src;
+  rtx dest;
+  cselib_val *src_elt;
+  cselib_val *dest_addr_elt;
+};
+
+enum cselib_record_what
+{
+  CSELIB_RECORD_MEMORY = 1,
+  CSELIB_PRESERVE_CONSTANTS = 2
+};
+
+extern void (*cselib_discard_hook) (cselib_val *);
+extern void (*cselib_record_sets_hook) (rtx insn, struct cselib_set *sets,
+					int n_sets);
+
+extern cselib_val *cselib_lookup (rtx, enum machine_mode,
+				  int, enum machine_mode);
+extern cselib_val *cselib_lookup_from_insn (rtx, enum machine_mode,
+					    int, enum machine_mode, rtx);
+extern void cselib_init (int);
+extern void cselib_clear_table (void);
+extern void cselib_finish (void);
+extern void cselib_process_insn (rtx);
+extern bool fp_setter_insn (rtx);
+extern enum machine_mode cselib_reg_set_mode (const_rtx);
+extern int rtx_equal_for_cselib_p (rtx, rtx);
+extern int references_value_p (const_rtx, int);
+extern rtx cselib_expand_value_rtx (rtx, bitmap, int);
+typedef rtx (*cselib_expand_callback)(rtx, bitmap, int, void *);
+extern rtx cselib_expand_value_rtx_cb (rtx, bitmap, int,
+				       cselib_expand_callback, void *);
+extern bool cselib_dummy_expand_value_rtx_cb (rtx, bitmap, int,
+					      cselib_expand_callback, void *);
+extern rtx cselib_subst_to_values (rtx, enum machine_mode);
+extern rtx cselib_subst_to_values_from_insn (rtx, enum machine_mode, rtx);
+extern void cselib_invalidate_rtx (rtx);
+
+extern void cselib_reset_table (unsigned int);
+extern unsigned int cselib_get_next_uid (void);
+extern void cselib_preserve_value (cselib_val *);
+extern bool cselib_preserved_value_p (cselib_val *);
+extern void cselib_preserve_only_values (void);
+extern void cselib_preserve_cfa_base_value (cselib_val *, unsigned int);
+extern void cselib_add_permanent_equiv (cselib_val *, rtx, rtx);
+extern bool cselib_have_permanent_equivalences (void);
+extern void cselib_set_value_sp_based (cselib_val *);
+extern bool cselib_sp_based_value_p (cselib_val *);
+
+extern void dump_cselib_table (FILE *);
+
+/* Return the canonical value for VAL, following the equivalence chain
+   towards the earliest (== lowest uid) equivalent value.  */
+
+static inline cselib_val *
+canonical_cselib_val (cselib_val *val)
+{
+  cselib_val *canon;
+
+  if (!val->locs || val->locs->next
+      || !val->locs->loc || GET_CODE (val->locs->loc) != VALUE
+      || val->uid < CSELIB_VAL_PTR (val->locs->loc)->uid)
+    return val;
+
+  canon = CSELIB_VAL_PTR (val->locs->loc);
+  gcc_checking_assert (canonical_cselib_val (canon) == canon);
+  return canon;
+}