在memcpy/memcpy.hpp 实现了逐字节复制、字长(long)、avx256、avx512的比较。 在memcpy/test.cpp 中做了正确性检测和简单的benchmark。未完成地址不对齐的测试,按照avx指令集文档mm_store和mm_load指令不需要对齐也会保证正确性,不过可能会慢。
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