Morning people of the Linux !
Recently I came to a question I do not know the answer to although I am with Linux for >20 years,
I am talking about the CPU architecture features likes SIMD, SSE, AES, ... and related gcc CPU architecture switches
-maes, -msse3, -msse4 -mrdrand are examples of such gcc switches.
I know that OPENSSL queries CPU features in run-time and then selects precompiled functions that takes advantage of a specific feature.
I think the kernel does the same
So I begin to think that such compiler switches are good only to C functions which are written in a very specific way to allow gcc to recognize graphic or crypto processing patterns and generate the assembly in order to utilize those assem;y extensions.
Otherwise those switches does nothing good.
Please enlighten me on the issue.
Be Healthy,
Lev
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