2012-01-10 Richard Guenther <rguenther@suse.de>

[pf3gnuchains/gcc-fork.git] / gcc / cselib.h

diff --git a/gcc/cselib.h b/gcc/cselib.h
index 433f4de..6a9d795 100644 (file)
--- a/gcc/cselib.h
+++ b/gcc/cselib.h
@@ -1,6 +1,7 @@
 /* Common subexpression elimination for GNU compiler.
-   Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
-   1999, 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
+   Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997,
+   1998, 1999, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
+   Free Software Foundation, Inc.
 
 This file is part of GCC.
 
@@ -19,9 +20,12 @@ along with GCC; see the file COPYING3.  If not see
 <http://www.gnu.org/licenses/>.  */
 
 /* Describe a value.  */
-typedef struct GTY(()) cselib_val_struct {
+typedef struct cselib_val_struct {
   /* The hash value.  */
-  unsigned int value;
+  unsigned int hash;
+
+  /* A unique id assigned to values.  */
+  int uid;
 
   /* A VALUE rtx that points back to this structure.  */
   rtx val_rtx;
@@ -38,7 +42,7 @@ typedef struct GTY(()) cselib_val_struct {
 } cselib_val;
 
 /* A list of rtl expressions that hold the same value.  */
-struct GTY(()) elt_loc_list {
+struct elt_loc_list {
   /* Next element in the list.  */
   struct elt_loc_list *next;
   /* An rtl expression that holds the value.  */
@@ -47,12 +51,6 @@ struct GTY(()) elt_loc_list {
   rtx setting_insn;
 };
 
-/* A list of cselib_val structures.  */
-struct GTY(()) elt_list {
-  struct elt_list *next;
-  cselib_val *elt;
-};
-
 /* Describe a single set that is part of an insn.  */
 struct cselib_set
 {
@@ -62,12 +60,21 @@ struct cselib_set
   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);
-extern void cselib_init (bool record_memory);
+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);
@@ -77,14 +84,36 @@ 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 rtx cselib_subst_to_values (rtx);
+                                      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 void cselib_invalidate_rtx (rtx);
 
-extern void cselib_reset_table_with_next_value (unsigned int);
-extern unsigned int cselib_get_next_unknown_value (void);
+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 (bool);
+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 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;
+}