ATLAS is an approach for the automatic generation and optimization of numerical software. Currently ATLAS supplies optimized versions for the complete set of linear algebra kernels known as the Basic Linear Algebra Subroutines (BLAS), and a subset of the linear algebra routines in the LAPACK library.
These libraries use the SSE1 extensions only available on Pentium III and later processors.
On some architectures, multiple binary packages are provided to take advantage of certain commonly available processor instruction set extensions. The instruction extension set used is indicated in the package name, with 'base' denoting no extensions. In general, you will obtain the best performance by installing the package with the most advanced instruction extension set your machine is capable of running.
Homepage: http://math-atlas.sourceforge.net/
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