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Optimizing A Vector With Sse, And Issues That Arise

According to the most recent Steam Hardware Survey, 99% of steam users have SSE2 and SSE3 instruction support. The most immediately obvious thing to do with SSE is to try to optimize 4-vector math. However, a naiive reimplementation of vector methods doesn't come close to the theoretical 4x improvement that one would expect from an SSE implementation

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