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Prerequisites
Description
In the context of #1476 I looked for low hanging fruit on the hot path of the JPEG encoding pipeline.
Using a benchmark (encoding a 4K image) with the ETW Profiler attached, I've noticed that
Block8x8F.Scale16X16To8X8
is responsible for 9.8% of the total time taken. I've noticed that the method is the optimal candidate for vectorization (AVX2) and went for it.Block8x8F.Scale16X16To8X8
🚀Benchmarks