caller-save.c (init_caller_save): If we were unable to find a simple insn which…

caller-save.c (init_caller_save): If we were unable to find a simple insn which meets all its constraints to save...

	* caller-save.c (init_caller_save): If we were unable to
	find a simple insn which meets all its constraints to save
	and restore with a single insn in a mode, then set
	regno_save_mode to VOIDmode to insure that this mode is never
	used to caller-save the	current register.

From-SVN: r2038

gcc/caller-save.c

@@ -223,11 +223,15 @@ init_caller_save ()
 	      ok &= constrain_operands (reg_restore_code[i][j], 1);
 	    }
 
-	if (! ok && j == 1)
-	  {
-	    call_fixed_regs[i] = 1;
-	    SET_HARD_REG_BIT (call_fixed_reg_set, i);
-	  }
+	  if (! ok)
+	    {
+	      regno_save_mode[i][j] = VOIDmode;
+	      if (j == 1)
+		{
+		  call_fixed_regs[i] = 1;
+		  SET_HARD_REG_BIT (call_fixed_reg_set, i);
+		}
+	    }
       }
 
   end_sequence ();