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Application of MMX and SSE optimized memory copy
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Generally, VC and memcpy efficiency in General. But in dealing with a large block of memory and on the memory operation, efficiency is not high. Actually spread of CPU instruction sets MMX, SSE and later both 64-bit and 128-bit instruction can be as simple as improving memory operations. However there are some restrictions, because before and after taking into account CPU instruction sequence, otherwise the effect of optimization is not obvious. This is a simple optimization example using MMX/SSE.
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