[entry: main]
[enable: logical_registers]

// With the logical_registers extension, r1..r14 name the general-purpose
// registers (r1 = rax, r2 = rbx, ...) instead of the architecture names.
// Computes (4 + 3) * 3 = 21 and returns it as the exit status.
const SYS_EXIT = 60

proc main
{
    r1 = 4   // rax
    r2 = 3   // rbx
    r1 += r2 // 7
    r1 *= r2 // 21

    r6 = r1  // rdi = 21 (the exit status)
    r1 = SYS_EXIT
    syscall
}