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Intel Data Alignment
SSE2 16 Byte AVX 32 Bytes Xeon Phi 64 Bytes Alignment increases the efficiency of data loads and stores to and from the processor. When targeting the Intel® Supplemental Streaming Extensions 2 (Intel® SSE 2) platforms, use 16-byte alignment that facilitates the use of SSE-aligned load instructions. When targeting the Intel® Advanced Vector Extensions (Intel® AVX) instruction set, try to align data on a 32-byte boundary. (See Improving Performance by Aligning Data .) For Intel® Xeon Phi™ coprocessors, memory movement is optimal on 64-byte boundaries. (See Data Alignment to Assist Vectorization .) https://software.intel.com/en-us/articles/explicit-vector-programming-best-known-methods
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