Which assembler requires that? Let me guess, GAS in Intel mode, just to make it more painful because they don't want you to use it? NASM syntax: mov rax

Which assembler requires that? Let me guess, GAS in Intel mode, just to make it more painful because they don't want you to use it? NASM syntax: mov rax,[Foo] ;load var into reg, QWORD is implicit add dword [Bar],1234h ;add constant to DWORD var movzx eax,byte [rsi] ;zero extend BYTE to DWORD reg