Abstract
UCSD Pascal is implemented as a machine-independent virtual machine. This virtual machine is usually interpreted on a host computer by machine language instructions, which, in turn, are often interpreted by microcode. Performance of a virtual machine is generally a function of the number of levels of interpretation required to perform a computation. By bypassing one or more of these layers, it should be possible to enhance performance.To test this hypothesis, a Pascal interpreter was written for the PDP-11/60. After analysis of the Pascal machine, changes were made that interpreted selected portions of the virtual machine directly in microcode.This paper describes the microcode which was added, and discusses the improvements which resulted.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.