Explain the following statement mov axbpdi8Solutionmov ax bp

Explain the following statement:

mov ax,[bp+di+8]

Solution

mov ax, [bp+di+8] is of the following type

mov ax, [baseReg + indexReg + constant]

This statement copies a value into the register AX. Combined, the three parameters in brackets determine what is called the effective address, which is simply the offset referenced by the instruction. The following rules apply:

   baseReg can be: bp or bx
indexReg can be: si or di
constant can be: 16-bit signed number if combined with registers
                      16-bit unsigned number if by itself

where baseReg gives the segment register used to evaluate the register.

In this case bp refers to the base pointer which uses Stack Segment register.

Also, this has a Base-Indexed Addressing Mode with Displacement.

di is the destination index.

Hence this statement overall means to move the value at bp+di+8 to the register ax.