+ RegMask, /* Vector Mask register */
+ RegBND, /* Bound register */
+};
+
+/* Special operand instances. */
+
+#define INSTANCE_WIDTH 3
+enum operand_instance
+{
+ InstanceNone,
+ Accum, /* Accumulator %al/%ax/%eax/%rax/%st(0)/%xmm0 */
+ RegC, /* %cl / %cx / %ecx / %rcx, e.g. register to hold shift count */
+ RegD, /* %dl / %dx / %edx / %rdx, e.g. register to hold I/O port addr */
+ RegB, /* %bl / %bx / %ebx / %rbx */