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As mentioned, netlib BLAS is not at all optimized, but it is definetly the "refblas". Using IKML, ACML, OpenBLAS or "your vendor" BLAS, you are (somehow) assured, that the results of the operation of the optimized BLAS is equal to the "refblas" up to a known error. Take into care that: vendors (intel, amd, nvidia, ...) try hard ...

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