PPT Slide

Using Pointers

• Loading a pointer:

MVK .S A, A5

MVKH .S A, A5

• Using a pointer:

LD .D *A5++, A0

&A

A5

A(0)

A(1)

A(2)

A(3)

+ +

. . .

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To perform the initialization, the move K or move KH instructions are used.

To load a pointer or to initialize it to some value, the instruction move K, .S, A, A5 is used. This instruction finds A in the memory map, and loads the lower 16 bits of that address into register A5.

Then, using the move KH, wherever A is in the memory map, the upper 16 bits of that address is placed into the high half, or upper 16- bits, of register A5.

When we have executed these two instructions, register A5 contains the address of A and it points to the first location in the A array, or A0.