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由 Timothy Gu 提交于
SSE2 version 4%-35% faster than MMX depending on the width. AVX2 version 1%-13% faster than SSE2 depending on the width.
5e586e1b
SSE2 version 4%-35% faster than MMX depending on the width. AVX2 version 1%-13% faster than SSE2 depending on the width.