* Perform multiplication of two matrices. * * R2 must be equal to C1 * * Resultant matrix size should be R1xC2 * \param[in] A first matrix to multiply * \param[in] B second matrix to multiply * \param[out] OUT output matrix (must be pre-allocated) * \param[in] R1 number of rows of first matrix * \param[in] C1 number of columns of first matrix * \param[in] R2 number of rows of second matrix
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