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In page Parrot virtual machine:

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Virtual machines such as the Java virtual machine and the current Perl 5 virtual machine are also stack based. Parrot developers chose a register-based design, reasoning that it more closely resembles a hardware design, allowing the vast literature on compiler optimization to be used in generating bytecode for the Parrot virtual machine that could run at speeds closer to machine code.[citation needed] Other register-based virtual machines inspired parts of Parrot's design, including LLVM, the Lua VM and Inferno's Dis.