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by gnufx
1712 days ago
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Regarding unrolling, -O3 contains -funroll-and-jam but not -funroll-loops. You may want one or the other, maybe both, depending on circumstances. I don't see much benefit from the available pragmas on HPC-type code unless for OpenMP, and "omp simd" isn't necessary to get vectorization in the places I've seen people say it is. Mileage always varies somewhat, of course. (Before second-guessing anything, use -fopt-info.) |
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