This article explains how modern CPUs use register renaming and out-of-order execution to enable parallelism, revealing that physical register files contain hundreds of registers beyond the architectural ones visible to programmers. It explores the algorithmic aspects of this hardware mechanism and its implications for compiler optimizations. The post uses ARM Neoverse V2 as a concrete example to illustrate these concepts.
Background
Modern CPUs use out-of-order execution and register renaming to improve performance by exploiting instruction-level parallelism, with physical register files being much larger than the architectural registers defined in instruction sets. This technique allows multiple instructions to execute simultaneously without conflicts.
- Source
- Lobsters
- Published
- Apr 25, 2026 at 09:07 PM
- Score
- 6.0 / 10