0x64 0x48 0x8b 0x3c 0x25 0x00 0x03 0x00 0x00
# CHECK: rep
-# CHECK-NEXT: stosq
+# CHECK-NEXT: stosq %rax, %es:(%rdi)
0xf3 0x48 0xab
# CHECK: rep
-# CHECK-NEXT: stosl
+# CHECK-NEXT: stosq %rax, %es:(%edi)
0xf3 0x67 0x48 0xab
# CHECK: movl 32(%rbp), %eax