Conditional Programming

If-else, Switch-case

Disadvantageous for CPU

Branch Prediction, leading to overall compile performance degradation due to branch misprediction penalty

While switch-case can be less favorable than if-else when sequentially checking multiple conditions, switch-case is mutually exclusive and typically has no significant performance impact

JIT: so you want to be faster than an interpreter on modern CPUs…

Since my previous blog entry about JIT compiler for PostgreSQL, sadly not much happened due to a lack of time, but still some things were done (biggest improvement was the port to ARM64, a few optimizations, implementing more opcodes…). But I am often asking myself how to really beat the interpreter… And on “modern” CPUs, with a well written interpreter, that’s far more complicated than many would imagine. So in order to explain all this and show how I am planning to improve performance (possibly of the interpreter itself too, thus making this endeavor self-defeating), let’s first talk about…

https://www.pinaraf.info/2025/10/jit-so-you-want-to-be-faster-than-an-interpreter-on-modern-cpus/

Conditional Programming

If-else, Switch-case

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