s390.c (s390_fixup_clobbered_return_reg): Do nothing if __builtin_return_address was not used.

	* config/s390/s390.c (s390_fixup_clobbered_return_reg):
	Do nothing if __builtin_return_address was not used.

From-SVN: r65133

gcc/ChangeLog

+2003-04-01  Ulrich Weigand  <uweigand@de.ibm.com>
+
+	* config/s390/s390.c (s390_fixup_clobbered_return_reg):
+	Do nothing if __builtin_return_address was not used.
+
 Tue Apr  1 18:18:23 CEST 2003  Jan Hubicka  <jh@suse.cz>
 
 	* i386.md (test patterns):  Allow memory operand in operand1.

gcc/config/s390/s390.c

@@ -4905,6 +4905,12 @@ s390_fixup_clobbered_return_reg (return_reg)
   bool replacement_done = 0;
   rtx insn;
 
+  /* If we never called __builtin_return_address, register 14
+     might have been used as temp during the prolog; we do
+     not want to touch those uses.  */
+  if (!has_hard_reg_initial_val (Pmode, REGNO (return_reg)))
+    return false;
+
   for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
     {
       rtx reg, off, new_insn;