make tablejump_p return the label as a rtx_insn *

gcc/ChangeLog:

2016-10-21  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>

	* cfgcleanup.c (merge_blocks_move_successor_nojumps): Adjust.
	(outgoing_edges_match): Likewise.
	(try_crossjump_to_edge): Likewise.
	* cfgrtl.c (try_redirect_by_replacing_jump): Likewise.
	(rtl_tidy_fallthru_edge): Likewise.
	* rtl.h (tablejump_p): Adjust prototype.
	* rtlanal.c (tablejump_p): Return the label as a rtx_insn *.

From-SVN: r241402

gcc/ChangeLog

 2016-10-21  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>
 
+	* cfgcleanup.c (merge_blocks_move_successor_nojumps): Adjust.
+	(outgoing_edges_match): Likewise.
+	(try_crossjump_to_edge): Likewise.
+	* cfgrtl.c (try_redirect_by_replacing_jump): Likewise.
+	(rtl_tidy_fallthru_edge): Likewise.
+	* rtl.h (tablejump_p): Adjust prototype.
+	* rtlanal.c (tablejump_p): Return the label as a rtx_insn *.
+
+2016-10-21  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>
+
 	* rtl.h (label_ref_label): New function.
 	(set_label_ref_label): New function.
 	(LABEL_REF_LABEL): Delete.

gcc/cfgcleanup.c

@@ -688,7 +688,7 @@ static void
 merge_blocks_move_successor_nojumps (basic_block a, basic_block b)
 {
   rtx_insn *barrier, *real_b_end;
-  rtx label;
+  rtx_insn *label;
   rtx_jump_table_data *table;
 
   /* If we are partitioning hot/cold basic blocks, we don't want to
@@ -709,7 +709,7 @@ merge_blocks_move_successor_nojumps (basic_block a, basic_block b)
   /* If there is a jump table following block B temporarily add the jump table
      to block B so that it will also be moved to the correct location.  */
   if (tablejump_p (BB_END (b), &label, &table)
-      && prev_active_insn (as_a<rtx_insn *> (label)) == BB_END (b))
+      && prev_active_insn (label) == BB_END (b))
     {
       BB_END (b) = table;
     }
@@ -1697,7 +1697,7 @@ outgoing_edges_match (int mode, basic_block bb1, basic_block bb2)
   /* Check whether there are tablejumps in the end of BB1 and BB2.
      Return true if they are identical.  */
     {
-      rtx label1, label2;
+      rtx_insn *label1, *label2;
       rtx_jump_table_data *table1, *table2;
 
       if (tablejump_p (BB_END (bb1), &label1, &table1)
@@ -1994,7 +1994,7 @@ try_crossjump_to_edge (int mode, edge e1, edge e2,
      they have been already compared for equivalence in outgoing_edges_match ()
      so replace the references to TABLE1 by references to TABLE2.  */
   {
-      rtx label1, label2;
+      rtx_insn *label1, *label2;
       rtx_jump_table_data *table1, *table2;
 
       if (tablejump_p (BB_END (osrc1), &label1, &table1)

gcc/cfgrtl.c

@@ -1101,7 +1101,7 @@ try_redirect_by_replacing_jump (edge e, basic_block target, bool in_cfglayout)
     {
       rtx_code_label *target_label = block_label (target);
       rtx_insn *barrier;
-      rtx label;
+      rtx_insn *label;
       rtx_jump_table_data *table;
 
       emit_jump_insn_after_noloc (targetm.gen_jump (target_label), insn);
@@ -1773,7 +1773,7 @@ rtl_tidy_fallthru_edge (edge e)
       && (any_uncondjump_p (q)
 	  || single_succ_p (b)))
     {
-      rtx label;
+      rtx_insn *label;
       rtx_jump_table_data *table;
 
       if (tablejump_p (q, &label, &table))
@@ -1786,8 +1786,7 @@ rtl_tidy_fallthru_edge (edge e)
 	  PUT_CODE (label, NOTE);
 	  NOTE_KIND (label) = NOTE_INSN_DELETED_LABEL;
 	  NOTE_DELETED_LABEL_NAME (label) = name;
-	  rtx_insn *lab = safe_as_a <rtx_insn *> (label);
-	  reorder_insns (lab, lab, PREV_INSN (q));
+	  reorder_insns (label, label, PREV_INSN (q));
 	  delete_insn (table);
 	}
 

gcc/rtl.h

@@ -3040,7 +3040,7 @@ extern rtx replace_rtx (rtx, rtx, rtx, bool = false);
 extern void replace_label (rtx *, rtx, rtx, bool);
 extern void replace_label_in_insn (rtx_insn *, rtx, rtx, bool);
 extern bool rtx_referenced_p (const_rtx, const_rtx);
-extern bool tablejump_p (const rtx_insn *, rtx *, rtx_jump_table_data **);
+extern bool tablejump_p (const rtx_insn *, rtx_insn **, rtx_jump_table_data **);
 extern int computed_jump_p (const rtx_insn *);
 extern bool tls_referenced_p (const_rtx);
 

gcc/rtlanal.c

@@ -3103,26 +3103,26 @@ rtx_referenced_p (const_rtx x, const_rtx body)
    *LABELP and the jump table to *TABLEP.  LABELP and TABLEP may be NULL.  */
 
 bool
-tablejump_p (const rtx_insn *insn, rtx *labelp, rtx_jump_table_data **tablep)
+tablejump_p (const rtx_insn *insn, rtx_insn **labelp,
+	     rtx_jump_table_data **tablep)
 {
-  rtx label;
-  rtx_insn *table;
-
   if (!JUMP_P (insn))
     return false;
 
-  label = JUMP_LABEL (insn);
-  if (label != NULL_RTX && !ANY_RETURN_P (label)
-      && (table = NEXT_INSN (as_a <rtx_insn *> (label))) != NULL_RTX
-      && JUMP_TABLE_DATA_P (table))
-    {
-      if (labelp)
-	*labelp = label;
-      if (tablep)
-	*tablep = as_a <rtx_jump_table_data *> (table);
-      return true;
-    }
-  return false;
+  rtx target = JUMP_LABEL (insn);
+  if (target == NULL_RTX || ANY_RETURN_P (target))
+    return false;
+
+  rtx_insn *label = as_a<rtx_insn *> (target);
+  rtx_insn *table = next_insn (label);
+  if (table == NULL_RTX || !JUMP_TABLE_DATA_P (table))
+    return false;
+
+  if (labelp)
+    *labelp = label;
+  if (tablep)
+    *tablep = as_a <rtx_jump_table_data *> (table);
+  return true;
 }
 
 /* A subroutine of computed_jump_p, return 1 if X contains a REG or MEM or