-movb 0, %al // CHECK: movb 0, %al # encoding: [0xa0,A,A,A,A]
-movw 0, %ax // CHECK: movw 0, %ax # encoding: [0x66,0xa1,A,A,A,A]
-movl 0, %eax // CHECK: movl 0, %eax # encoding: [0xa1,A,A,A,A]
+movb 0, %al // CHECK: movb 0, %al # encoding: [0xa0,0x00,0x00,0x00,0x00]
+movw 0, %ax // CHECK: movw 0, %ax # encoding: [0x66,0xa1,0x00,0x00,0x00,0x00]
+movl 0, %eax // CHECK: movl 0, %eax # encoding: [0xa1,0x00,0x00,0x00,0x00]