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FFmpeg devs boast of up to 94x performance boost after implementing handwritten AVX-512 assembly code (www.tomshardware.com)

submitted 1 week ago by [email protected] to c/[email protected]

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Unfortunately, due to the complexity and specialized nature of AVX-512, such optimizations are typically reserved for performance-critical applications and require expertise in low-level programming and processor microarchitecture.

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[–] [email protected] 1 points 1 week ago* (last edited 1 week ago)

yes, as i said

from the article it’s not clear what the performance boost is relative to intrinsics

(they don't make that comparison in the article)

so its not clear exactly how handwritten asm compares to intrinsics in this specific comparison. we can't assume their handwritten AVX-512 asm and instrinics AVX-512 will perform identically here, it may be better, or worse.

also worth noting they're discussing benchmarking of a specific function, so overall performance on executing a given set of commands may be quite different depending what can and can't be unrolled and in which order for different dependencies.