You can see a project switch from a stack-based VM to a register-based VM here[0] [1]. For [1], search page for "vdbe" (virtual database engine). Hopefully you

You can see a project switch from a stack-based VM to a register-based VM here[0] [1]. For [1], search page for "vdbe" (virtual database engine). Hopefully you find interesting things. [0] https://www.sqlite.org/vdbe.html https://www.sqlite.org/vdbe.html [1] http://www.sqlite.org/src/timeline?c=2007-11-11&n=400 http://www.sqlite.org/src/timeline?c=2007-11-11&n=400