mcore.h (REGNO_REG_CLASS): Do not index beyond the end of the regno_reg_class array.

	* config/mcore/mcore.h (REGNO_REG_CLASS): Do not index beyond the
	end of the regno_reg_class array.

From-SVN: r173015

gcc/ChangeLog

+2011-04-27  Nick Clifton  <nickc@redhat.com>
+
+	* config/mcore/mcore.h (REGNO_REG_CLASS): Do not index beyond the
+	end of the regno_reg_class array.
+
 2011-04-27  Jakub Jelinek  <jakub@redhat.com>
 
 	PR c/48742

gcc/config/mcore/mcore.h

@@ -357,7 +357,7 @@ enum reg_class
    or could index an array.  */
 
 extern const enum reg_class regno_reg_class[FIRST_PSEUDO_REGISTER];
-#define REGNO_REG_CLASS(REGNO) regno_reg_class[REGNO]
+#define REGNO_REG_CLASS(REGNO) ((REGNO) < FIRST_PSEUDO_REGISTER ? regno_reg_class[REGNO] : NO_REGS)
 
 /* When this hook returns true for MODE, the compiler allows
    registers explicitly used in the rtl to be used as spill registers