modernization examples for Fortran/C/C++

[TimP]

I prepared a presentation on some cases where current Intel compilers don't automatically optimize examples of legacy code, pursuant to a request from Intel.  Although the request was for a presentation this month, there has been no response in the last 2 weeks, so I thought I would post it here in case anyone is interested.

One of the goals set for the presentation is to help those who are familiar with only one of the languages to interpret advice from Intel which is couched in another language, so I present exactly equivalent optimized source code in multiple languages.

Several OpenMP 4 features are demonstrated and checked out for portability between Intel and gnu compilers, although the capability of outer loop parallel simd optimization is unique to Intel compilers.

An example of parallel simd reduction(max: ) is presented.  This requires outer parallel reduction and inner simd reduction loops with separate inner and outer reduction variables. 

Full source code is posted at https://github.com/tprince/   ; There are examples where ifort can optimize the legacy source code fully by auto-vectorization and auto-parallelization (which I don't cover in the presentation).

[jimiles]

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