## ALP Programming Guide and Reference

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### Address-Size Attribute for Stack

Instructions that use the stack implicitly (for example: POP EAX) also have a stack address-size attribute of either 16 or 32 bits. Instructions with a stack address-size attribute of 16 use the 16-bit SP stack pointer register; instructions with a stack address-size attribute of 32 bits use the 32-bit ESP register to form the address of the top of the stack.

The stack address-size attribute is controlled by the B bit of the data- segment descriptor in the SS register. A value of zero in the B bit selects a stack address-size attribute of 16; a value of one selects a stack address-size attribute of 32.