-extern cselib_val *cselib_lookup PARAMS ((rtx, enum machine_mode, int));
-extern void cselib_update_varray_sizes PARAMS ((void));
-extern void cselib_init PARAMS ((void));
-extern void cselib_finish PARAMS ((void));
-extern void cselib_process_insn PARAMS ((rtx));
-extern int rtx_equal_for_cselib_p PARAMS ((rtx, rtx));
-extern int references_value_p PARAMS ((rtx, int));
-extern rtx cselib_subst_to_values PARAMS ((rtx));
+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 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 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;
+}