No opcode suffix and no register operand creates ambiguous size.

[nathanhjay]

The following Dyninst output instructions could not be assembled due to the error "". Below are 3 examples including the input bytes, Dyninst output and correct output.

Bytes: 81 5d eb af 74 87 d8
Dyninst: sbb $0xd88774af,0xffffffffffffffeb(%rbp)
Correct output: sbbl $0xd88774af, -0x15(%rbp)

Bytes: ff 0b
Dyninst: dec (%rbx)
Correct output: decl (%rbx)

Bytes: 66 83 bc 0 60 c2 80 6 fb
Dyninst: cmp $0xfb,0x680c260(%rax,%rax,1)
Correct output: cmpw $0xfffb, 0x680c260(%rax, %rax, 1)