In x86 Assembler, given that you have

* **Immediate addressing mode** for allocating numbers
* **Register addressing mode** for registers
* **Direct addressing mode** for memory addresses,

why do you need **Indexed and Base Pointer addressing modes**?
Each could be replaced by a loop as far as I know.

Also **Indirect mode** doesn't seem to be overly useful either, since you can simply use Direct mode instead to reference the memory address. What is the purpose of first accessing a register which then contains a pointer to a memory address?

In short, which addressing modes are really necessary?