Of course not. With the meltdown/spectre vulnerabilities and mitigations we see that how a processor/OS/program stack executes code can change from year to year

Of course not. With the meltdown/spectre vulnerabilities and mitigations we see that how a processor/OS/program stack executes code can change from year to year or month to month, with significant performance differences. Maybe that's an exceptional blip, maybe it's a portent for the future.