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`-march-native` enables more aggressive vectorization and code generation for exactly your CPU `-fopenmp` enables parallel matrix multiplication in Eigen (it makes 2x speedup using 12 cores on 100000x256 and K=1024)
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-march-nativeenables more aggressive vectorization and code generation for exactly your CPU-fopenmpenables parallel matrix multiplication in Eigen (it makes 2x speedup using 12 cores on 100000x256 and K=1024)