AVX-512 gets mocked as a slower, buggy overfit, with one AVX2 version running 7x faster

ssh4net · x · 2026-07-29

• A repost argues that “AVX-512 larping” is overhyped: a plain C++ version using AVX2 reportedly runs 7x faster than the AVX-512 version on a high-end Xeon.
• The same AVX-512 implementation allegedly has a correctness bug that can trash nearby pixels when transparent points appear.
• The attached benchmark screenshot backs the claim with a measured 6.5x AVX2 speedup and references the odiff image-diff pipeline.
• The joke lands because the “beautiful” vectorized version is both slower and less correct, which is exactly the kind of tech drama people share.

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