Get the upper half of the EAX register

Question

In x86 assembly language, is there any way to obtain the upper half of the EAX register? I know that the AX register already contains the lower hal

Answer 1

For 16-bit mode, this is the smallest (not fastest) code: only 4 bytes.

push eax  ; 2 bytes: prefix + opcode 
pop ax    ; 1 byte: opcode
pop bx    ; 1 byte: opcode

It's even more compact than single instruction shld ebx,eax,16 which occupies 5 bytes of memory.