Revert changes which crept in by accident.

From-SVN: r24526

gcc/calls.c

@@ -33,10 +33,6 @@ Boston, MA 02111-1307, USA.  */
 #define PREFERRED_STACK_BOUNDARY STACK_BOUNDARY
 #endif
 
-extern int frame_offset;
-extern rtx tail_recursion_label;
-extern rtx tail_recursion_reentry;
-
 /* Decide whether a function's arguments should be processed
    from first to last or from last to first.
 
@@ -66,8 +62,6 @@ struct arg_data
   rtx value;
   /* Initially-compute RTL value for argument; only for const functions.  */
   rtx initial_value;
-  /*  */
-  rtx sibcall_value;
   /* Register to pass this argument in, 0 if passed on stack, or an
      PARALLEL if the arg is to be copied into multiple non-contiguous
      registers.  */
@@ -840,7 +834,6 @@ expand_call (exp, target, ignore)
   tree actparms = TREE_OPERAND (exp, 1);
   /* RTX for the function to be called.  */
   rtx funexp;
-  rtx tail_recursion_insns = NULL_RTX;
   /* Data type of the function.  */
   tree funtype;
   /* Declaration of the function being called,
@@ -1923,7 +1916,6 @@ expand_call (exp, target, ignore)
      once we have started filling any specific hard regs.  */
   precompute_register_parameters (num_actuals, args, &reg_parm_seen);
 
-
 #if defined(ACCUMULATE_OUTGOING_ARGS) && defined(REG_PARM_STACK_SPACE)
 
   /* Save the fixed argument area if it's part of the caller's frame and
@@ -2071,92 +2063,6 @@ expand_call (exp, target, ignore)
 	}
     }
 
-  /* See if this is a potential tail recursive call.  We can not know for
-     sure until we have expanded the entire function into RTL and can examine
-     the cfg and other data.  But we have to mark it and save some information
-     now so that we can optimize it later.  */
-  if (optimize
-      && TREE_CODE (exp) == CALL_EXPR
-      && TREE_CODE (TREE_OPERAND (exp, 0)) == ADDR_EXPR
-      && TREE_OPERAND (TREE_OPERAND (exp, 0), 0) == current_function_decl)
-    {
-      tree actuals, formals, a, f;
-      int i;
-
-      actuals = TREE_OPERAND (exp, 1);
-      formals = DECL_ARGUMENTS (current_function_decl);
-      /* The caller and callee must have the same number of arguments and
-	 they must be of compatible types and modes.  */
-      for (a = actuals, f = formals, i = 0;
-	   a != NULL_TREE && f != NULL_TREE;
-	   a = TREE_CHAIN (a) , f = TREE_CHAIN (f), i++)
-	{
-	  if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_VALUE (a)))
-	      != TYPE_MAIN_VARIANT (TREE_TYPE (f)))
-	    break;
-	  if (GET_CODE (DECL_RTL (f)) != REG || DECL_MODE (f) == BLKmode)
-	    break;
-	  if (!args[i].sibcall_value)
-	    args[i].sibcall_value = args[i].value;
-	}
-
-      
-      if (a == NULL_TREE && f == NULL_TREE)
-	{
-	  /* Create the tail recursion label if it has not been created
-	     already.  */
-	  if (tail_recursion_label == 0)
-	    {
-	      tail_recursion_label = gen_label_rtx ();
-	      emit_label_after (tail_recursion_label, tail_recursion_reentry);
-	    }
-
-	  /* We have a potential tail recursion site.
-
-	     Start a new sequence for any RTL generated which might be used
-	     to implement tail recursion optimizations later.  */
-	  push_to_sequence (0);
-
-	  /* Find which actual values refer to current values of previous
-	     formals.  Copy each of them now, before any formal is changed.  */
-	  for (a = actuals, i = 0; a != NULL_TREE; a = TREE_CHAIN (a), i++)
-	    {
-	      int copy = 0, j;
-
-	      for (f = formals, j = 0; j < i; f = TREE_CHAIN (f), j++)
-		if (reg_mentioned_p (DECL_RTL (f), args[i].value))
-		  {
-		    copy = 1;
-		    break;
-		  }
-	      if (copy)
-		args[i].sibcall_value = copy_to_reg (args[i].value);
-	    }
-
-	  /* Store the values of the actuals into the formals.  */
-	  for (f = formals, a = actuals, i = 0; f != NULL_TREE;
-	       f = TREE_CHAIN (f), a = TREE_CHAIN (a), i++)
-	    {
-	      if (GET_MODE (DECL_RTL (f)) == GET_MODE (args[i].sibcall_value))
-		emit_move_insn (DECL_RTL (f), args[i].sibcall_value);
-	      else
-		convert_move (DECL_RTL (f), args[i].sibcall_value,
-			      TREE_UNSIGNED (TREE_TYPE (TREE_VALUE (a))));
-	    }
-
-	  /* Emit any queued operations.  */
-	  emit_queue ();
-
-	  /* Goto the tail recursion label.  */
-	  expand_goto_internal (NULL_TREE, tail_recursion_label, get_last_insn);
-
-	  tail_recursion_insns = get_insns ();
-	  end_sequence ();
-	  emit_insns (tail_recursion_insns);  
-	  return;
-	}
-    }
-      
   /* Perform postincrements before actually calling the function.  */
   emit_queue ();
 
@@ -3784,10 +3690,7 @@ store_one_arg (arg, argblock, may_be_alloca, variable_size,
      arg->stack_slot and it matters when they are not the same.
      It isn't totally clear that this is correct in all cases.  */
   if (partial == 0)
-    {
-      arg->sibcall_value = arg->value;
-      arg->value = arg->stack_slot;
-    }
+    arg->value = arg->stack_slot;
 
   /* Once we have pushed something, pops can't safely
      be deferred during the rest of the arguments.  */