Editing Parrot virtual machine (section)

==Examples==

===Registers===
Parrot is register-based like most hardware [[Central processing unit|CPUs]], and unlike most virtual machines, which are stack-based. Parrot provides four types of registers:

* I: native [[integer]] type
* N: [[floating-point arithmetic|floating-point]] numbers
* S: advanced [[String (computer science)|string]] registers with [[Unicode]] support
* P: PMC, or ''Polymorphic Container'' — Parrot object type

Parrot provides an arbitrary number of registers; this number is fixed at compile time per subroutine.

===Arithmetic operations===
In PASM
<syntaxhighlight lang="asm">
    set I1, 4
    inc I1        # I1 is now 5
    add I1, 2     # I1 is now 7
    set N1, 42.0
    dec N1        # N1 is now 41.0
    sub N1, 2.0   # N1 is now 39.0
    print I1
    print ', '
    print N1
    print "\n"
    end
</syntaxhighlight>
In PIR
<syntaxhighlight lang="perl6">
 .sub 'main' :main
    $I1 = 4
    inc $I1     # $I1 is now 5
    $I1 += 2    # $I1 is now 7
    $N1 = 42.0
    dec $N1     # $N1 is now 41.0
    $N1 -= 2.0  # $N1 now 39.0
    print $I1
    print ', '
    print $N1
    print "\n"
 .end
</syntaxhighlight>