XXH_FORCE_MEMORY_ACCESS
#if (defined(XXH_FORCE_MEMORY_ACCESS) && (XXH_FORCE_MEMORY_ACCESS==2))
#elif (defined(XXH_FORCE_MEMORY_ACCESS) && (XXH_FORCE_MEMORY_ACCESS==1))
#ifndef XXH_FORCE_MEMORY_ACCESS /* can be defined externally, on command line for example */