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There are two dedicated CPU feature flags to indicate that REP STOS/MOV are fast and usa ble as sh... There are two dedicated CPU feature flags to indicate that REP STOS/MOV are fast and usa ble as short instruction sequence for memset/memcpy. Having to hand-roll optimized routines for each new CPU generation has been an ongoing pain for decades.And yet here we are again. Shouldn't this be part of some timing testsuite of CPU vendors by now? I'm completely making stuff up here, but I wonder if this