struct _Alpha_EV5_PR_Format {
unsigned long Index : 16;/* 0x0:0 4 */
unsigned long Rb : 5;/* 0x0:16 4 */
unsigned long Ra : 5;/* 0x0:21 4 */
unsigned long Opcode : 6;/* 0x0:26 4 */
};
/* source: Windows 2000 RC2 DDK Alpha libcntpr.lib CodeView type records; build 2128 per the DDK's ntverp.h */