[GitHub] [doris] yiguolei commented on pull request #12936: [enhancement](string column)copy string continuous

[GitBox <gi...@apache.org>]

yiguolei commented on PR #12936:
URL: https://github.com/apache/doris/pull/12936#issuecomment-1256844469

   In lastes clang-14, our memcpy_overflow will be replaced by memcpy...
   
   void my_memcpy(char * __restrict dst, const char * __restrict src, ssize_t n)
   {
       while (n > 0)
       {
           _mm_storeu_si128(reinterpret_cast<__m128i *>(dst),
               _mm_loadu_si128(reinterpret_cast<const __m128i *>(src)));
           dst += 16;
           src += 16;
           n -= 16;
       }
   }
   
   You can find detail in this discussion: https://github.com/llvm/llvm-project/issues/56467


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