I'm not much of an expert, but the first thing that comes to mind is the binary size and speed. If you only need to implement the code once, and have a single optimized version, the output will be smaller, and probably a bit faster.
-- Rabin On Fri, 20 Aug 2021 at 11:54, Lev Olshvang <levon...@yandex.com> wrote: > 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 > _______________________________________________ > Linux-il mailing list > Linux-il@cs.huji.ac.il > http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il >
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