examples/arm64/sum.hdass


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[entry: main]
[enable: logical_registers]

// Sums 5 + 4 + 3 + 2 + 1 = 15 with a named countdown loop, returns it as the
// exit status. Shows three-operand arithmetic (r1 = r1 + r2 -> add x0, x0, x1).
const SYS_EXIT = 93

proc main
{
    r1 = 0
    r2 = 5
    while .countdown r2 > 0
    {
        r1 = r1 + r2
        r2 = r2 - 1
    }
    r9 = SYS_EXIT
    syscall
}