re PR tree-optimization/15108 ([tree-ssa] [regression] missed sib-calling for pointer changes)

        PR opt/15108
        * tree-tailcall.c (find_tail_calls): Don't check early for
        tail_recursion failure.

From-SVN: r82866

gcc/ChangeLog

+2004-06-09  Richard Henderson  <rth@redhat.com>
+
+	PR opt/15108
+	* tree-tailcall.c (find_tail_calls): Don't check early for
+	tail_recursion failure.
+
 2004-06-09  Diego Novillo  <dnovillo@redhat.com>
 
 	Move SSA_NAME annotations into tree_ssa_name.

gcc/tree-tailcall.c

@@ -460,11 +460,6 @@ find_tail_calls (basic_block bb, struct tailcall **ret)
       if (TREE_CODE (stmt) != MODIFY_EXPR)
 	return;
 
-      /* Unless this is a tail recursive call, we cannot do anything with
-	 the statement anyway.  */
-      if (!tail_recursion)
-	return;
-
       if (!process_assignment (stmt, stmt, bsi, &m, &a, &ass_var))
 	return;
     }
@@ -491,6 +486,11 @@ find_tail_calls (basic_block bb, struct tailcall **ret)
       && (ret_var != ass_var))
     return;
 
+  /* If this is not a tail recursive call, we cannot handle addends or
+     multiplicands.  */
+  if (!tail_recursion && (m || a))
+    return;
+
   nw = xmalloc (sizeof (struct tailcall));
 
   nw->call_block = bb;