This directory contain simple programs written in LEGv8 assembly. These programs are made to be compiled with the assembler in ../tools/asm, and used to simulate the CPUs in ../cpu-*.

• sumtwo.s: A program that sum two integers.
• sumarray.s: A program that sum the elements of an array.

The program sumtwo.s reads two values from memory into the registers X0 and X1', and then sums the values in those registers into the register X0'.

Although being simple, this program tests several features of the CPUs and the assembler:

• It tests the capacity of the assembler to convert the pseudo instruction LDA into actual LEGv8 instructions.
• It tests the capacity of the CPU to access data from memory.
• It tests the CPU's Arithmetic Logic Unit (ALU).
• It tests the usage of registers, both to read and to write into them.

The program sumarray.s reads ten 8-byte elements from the memory into X2 and sum them up into X3. X0 is a pointer to the current element of the array, and X1 is the size of the array.

In addition to the tests performed by sumtwo.s, this program tests the capacity of the CPU to branch with the CBZ instruction.