Description
Right now MOV encoded with opcode 8E use operand type w for its operand of addressing E which is defined as:
Word, regardless of operand-size attribute (for example, ENTER).
According to the intel docs:
8E /r MOV Sreg,r/m16** RM Valid Valid Move r/m16 to segment register.
REX.W + 8E /r MOV Sreg,r/m64** RM Valid Valid Move lower 16 bits of r/m64 to segment register.
When dealing with memory addressing the operand always points to word pointer as expected, but when dealing with register addressing, one need to specify the full register name even tho the instruction only uses the lower 16 bit of the register, thus I think the appropriate solution would be to split the syntax to mem and nomem attributes, when the mem one has operand type w and the nomem one has operand type v because the operand size prefix can affect the register in use according to my testing on objdump which is defined as::
Word or doubleword, depending on operand-size attribute (for example, INC (40), PUSH (50)).
For 64 bit mode the operand type should be vqp which is defined as:
Word or doubleword, depending on operand-size attribute, or quadword, promoted by REX.W in 64-bit mode.
EDIT: clarity