XXH_memcpy
XXH_memcpy((BYTE*)(state->mem32) + state->memsize, input, len);
XXH_memcpy((BYTE*)(state->mem32) + state->memsize, input, 16-state->memsize);
XXH_memcpy(state->mem32, p, bEnd-p);
XXH_memcpy(((BYTE*)state->mem64) + state->memsize, input, len);
XXH_memcpy(((BYTE*)state->mem64) + state->memsize, input, 32-state->memsize);
XXH_memcpy(state->mem64, p, bEnd-p);