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Execution Unit ○꠹｜Definition｜1st｜20251119205401-00-⌔
Execution unit
In computer engineering, an execution unit (E-unit or EU) is a part of a processing unit that performs the operations and calculations forwarded from the instruction unit.1 It may have its own internal control sequence unit (not to be confused with a CPU’s main control unit), some registers,2 and other internal units such as an arithmetic logic unit,3 address generation unit, floating-point unit, load–store unit, branch execution unit4 or other smaller and more specific components, and can be tailored to support a certain datatype, such as integers or floating-points.5
It is common for modern processing units to have multiple parallel functional units within its execution units, which is referred to as superscalar design.6 The simplest arrangement is to use a single bus manager unit to manage the memory interface and the others to perform calculations. Additionally, modern execution units are usually pipelined.
Printed 2026-06-28.
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Link to original Footnotes
“Execution Model Overview”. Intel. Retrieved 2024-06-23. ↩
“AMD Instinct™ MI100 microarchitecture — ROCm Documentation”. rocm.docs.amd.com. Retrieved 2024-06-23. ↩
“Intel® Iris® Xe GPU Architecture”. Intel. Retrieved 2024-06-23. ↩
Kanter, David (November 13, 2012). “Intel’s Haswell CPU Microarchitecture”. Real World Tech. ↩
“Execution Unit” discussion from the University of Massachusetts Amherst, archived on the Wayback Machine ↩
Cohen, William (2016-03-14). “Superscalar Execution”. Red Hat Developer. Retrieved 2024-06-23. ↩
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