Editing Register window (section)

{{Short description|CPU architecture feature to improve performance}}
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[[File:Register window.png|thumb|Example of a 4-window register window system]]
In [[computer engineering]], '''register windows''' are a feature which dedicates registers to a subroutine by dynamically aliasing a subset of internal registers to fixed, programmer-visible registers. Register windows are implemented to improve the performance of a processor by reducing the number of [[Stack (abstract data type)|stack]] operations required for function calls and returns. One of the most influential features of the [[Berkeley RISC]] design, they were later implemented in [[instruction set architectures]] such as [[AMD Am29000]], [[Intel i960]], [[Sun Microsystems]] [[SPARC]], and Intel [[IA-64|Itanium]].