Defeated The Whole Purpose Of Writing In Assembly

So someone submitted an AI-generated assembly patch to dav1d (a video decoder), and it was slower than C. Let that sink in. Assembly—the language you write when you want to squeeze every last CPU cycle out of your code—got outperformed by C because an AI wrote it.

The entire point of hand-writing assembly is to achieve performance that compilers can't match. You're basically telling the compiler "step aside, I'll optimize this myself." But AI-generated assembly? That's like hiring a robot chef to make instant ramen and somehow ending up with something worse than the microwave version.

Turns out AI doesn't understand cache lines, instruction pipelining, or the dark arts of SIMD optimization. It just vomits out syntactically correct assembly that runs like it's stuck in molasses. Modern C compilers have decades of optimization wizardry baked in—AI has... vibes.