instruction mnemonic การใช้

Instruction mnemonics use " destination, source " operand order.
:Intel used to claim it owned the instruction mnemonics for x86 microprocessors.
In use, a programmer would write several instruction mnemonics alongside one another, and the assembler would combine them with OR to devise the actual instruction word.
As software is routinely Intel's x86 assembly language because of the support for various sizes ( and backward compatibility ) in the instruction set, some instruction mnemonics carry " d " or " q " identifiers denoting " double-", " quad-" or " double-quad-", which are in terms of the architecture's original 16-bit word size.
The mnemonic letter M, for " memory " ( referenced by HL ), was lifted out from within the instruction mnemonic to become a syntactically freestanding " operand ", while registers and combinations of registers became very inconsistently denoted; either by abbreviated operands ( MVI D, LXI H and so on ), within the instruction mnemonic itself ( LDA, LHLD and so on ), or both at the same time ( LDAX B, STAX D and so on ).