Memory Layout

Addresses of memory

The minimum addressable element of memory is a byte. The maximum addressable element is a double word on $32$-bit machines and a quadword on $64$-bit machines.

General registers

All general registers are $32$-bit on $32$-bit CPUs and can contain doubleword values. On $64$-bit CPUs, all general registers are $64$-bit and can contain quadword values.

The figure below shows a typical memory layout.