calls.c (expand_call): Disable tail call generation once rtx_equal_function_value_matters is false.

        * calls.c (expand_call): Disable tail call generation once
        rtx_equal_function_value_matters is false.

        * reg-stack.c (convert_regs_1): Treat EDGE_ABNORMAL_CALL edges
        like EDGE_EH edges.

From-SVN: r33431

gcc/ChangeLog

-2000-04-26  Jason Merrill  <jason@casey.cygnus.com>
+2000-04-25  Richard Henderson  <rth@cygnus.com>
+
+	* calls.c (expand_call): Disable tail call generation once
+	rtx_equal_function_value_matters is false.
+
+	* reg-stack.c (convert_regs_1): Treat EDGE_ABNORMAL_CALL edges
+	like EDGE_EH edges.
+
+2000-04-25  Jason Merrill  <jason@casey.cygnus.com>
 
 	* dwarf2out.c (add_bound_info): Don't crash on an unexpanded SAVE_EXPR.
 

gcc/calls.c

@@ -2106,11 +2106,18 @@ expand_call (exp, target, ignore)
      pushed these optimizations into -O2.  Don't try if we're already
      expanding a call, as that means we're an argument.  Similarly, if
      there's pending loops or cleanups we know there's code to follow
-     the call.  */
+     the call.
+
+     If rtx_equal_function_value_matters is false, that means we've 
+     finished with regular parsing.  Which means that some of the
+     machinery we use to generate tail-calls is no longer in place.
+     This is most often true of sjlj-exceptions, which we couldn't
+     tail-call to anyway.  */
 
   try_tail_call = 0;
   if (flag_optimize_sibling_calls
       && currently_expanding_call == 1
+      && rtx_equal_function_value_matters
       && stmt_loop_nest_empty ()
       && ! any_pending_cleanups (1))
     {

gcc/reg-stack.c

@@ -2550,7 +2550,7 @@ convert_regs_1 (file, block)
       /* Care for EH edges specially.  The normal return path may return
 	 a value in st(0), but the EH path will not, and there's no need
 	 to add popping code to the edge.  */
-      if (e->flags & EDGE_EH)
+      if (e->flags & (EDGE_EH | EDGE_ABNORMAL_CALL))
 	{
 	  /* Assert that the lifetimes are as we expect -- one value
 	     live at st(0) on the end of the source block, and no