Write Once, Run Anywhere.” That was the promise of Java back in the 1990s. You could write your Java code on one platform, and it would run on any CPU implementing a Java Virtual Machine.
But for developers who need to squeeze every bit of performance out of their applications, that’s not enough.
https://opensource.googleblog.com/2018/02/cpu-features-library.html
ref - https://github.com/google/cpu_features
origin - https://www.pipiscrew.com/2018/02/the-cpu_features-library/ the-cpu_features-library