Costs and benefits are multi-dimensional

Posted Sep 7, 2025 9:49 UTC (Sun) by wtarreau (subscriber, #51152)
In reply to: Costs and benefits are multi-dimensional by jreiser
Parent article: No more 32-bit Firefox support

> A 64-bit build is not necessarily better in every dimension of cost than a 32-bit build

I absolutely agree. For example my build farm at home runs on cortex A72 cores. After long testing, it appears that 32-bit thumb2 binaries are up to ~20% faster than aarch64 ones. Needless to say that I've built my toolchains for that target! In all my tests, aarch64 code is systematically bigger and slower than thumb2, it's sad that they've not worked on a compact and efficient instruction set for aarch64.