Useful Side Effect
Some processors, such as Intel x86 and the IBM/390, have a Load effective address instruction. This performs a calculation of the effective operand address, but instead of acting on that memory location, it loads the address that would have been accessed into a register. This can be useful when passing the address of an array element to a subroutine. It may also be a slightly sneaky way of doing more calculation than normal in one instruction; for example, using such an instruction with the addressing mode "base+index+offset" (detailed below) allows one to add two registers and a constant together in one instruction. the types of addressing modes are, 1.direct addressing, 2.Immediate addressing, 3.indirect addressing, 4.simple addressing.
Read more about this topic: Addressing Mode
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