The extensive use of handwritten assembly in projects like dav1d directly challenges the assumption that modern compilers can always achieve optimal performance through auto-vectorization. Despite claims from software engineers, handcrafted assembly consistently outperforms C by orders of magnitude in critical video processing tasks, proving that low-level optimization is far from obsolete.
Impact: High. This ongoing debate highlights a fundamental tension between automated tooling and expert craftsmanship in software development. The persistent outperformance of assembly underscores the need to re-evaluate the limits of compiler technology and the enduring value of deep, specialized optimization.
In the source video, this keypoint occurs from 02:09:10 to 02:10:27.
Sources in support: Jean-Baptiste Kempf (Lead Developer of VLC, President of VideoLAN)

