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  <h1>Extensions</h1>

<ul>
<li>BLAS-like extensions</li>
</ul>
<table>
<thead>
<tr>
<th>Routine</th>
<th style="text-align: left;">Data Types</th>
<th style="text-align: left;">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td>?axpby</td>
<td style="text-align: left;">s,d,c,z</td>
<td style="text-align: left;">like axpy with a multiplier for y</td>
</tr>
<tr>
<td>?gemm3m</td>
<td style="text-align: left;">c,z</td>
<td style="text-align: left;">gemm3m</td>
</tr>
<tr>
<td>?imatcopy</td>
<td style="text-align: left;">s,d,c,z</td>
<td style="text-align: left;">in-place transpositon/copying</td>
</tr>
<tr>
<td>?omatcopy</td>
<td style="text-align: left;">s,d,c,z</td>
<td style="text-align: left;">out-of-place transpositon/copying</td>
</tr>
<tr>
<td>?geadd</td>
<td style="text-align: left;">s,d,c,z</td>
<td style="text-align: left;">matrix add</td>
</tr>
<tr>
<td>?gemmt</td>
<td style="text-align: left;">s,d,c,z</td>
<td style="text-align: left;">gemm but only a triangular part updated</td>
</tr>
</tbody>
</table>
<ul>
<li>BLAS-like and Conversion functions for bfloat16 (available when OpenBLAS was compiled with BUILD_BFLOAT16=1)</li>
<li><code>void cblas_sbstobf16</code> converts a float array to an array of bfloat16 values by rounding</li>
<li><code>void cblas_sbdtobf16</code> converts a double array to an array of bfloat16 values by rounding</li>
<li><code>void cblas_sbf16tos</code> converts a bfloat16 array to an array of floats</li>
<li><code>void cblas_dbf16tod</code> converts a bfloat16 array to an array of doubles</li>
<li><code>float cblas_sbdot</code> computes the dot product of two bfloat16 arrays</li>
<li><code>void cblas_sbgemv</code> performs the matrix-vector operations of GEMV with the input matrix and X vector as bfloat16  </li>
<li>
<p><code>void cblas_sbgemm</code> performs the matrix-matrix operations of GEMM with both input arrays containing bfloat16</p>
</li>
<li>
<p>Utility functions</p>
</li>
<li>openblas_get_num_threads</li>
<li>openblas_set_num_threads</li>
<li><code>int openblas_get_num_procs(void)</code> returns the number of processors available on the system (may include "hyperthreading cores")</li>
<li><code>int openblas_get_parallel(void)</code> returns 0 for sequential use, 1 for platform-based threading and 2 for OpenMP-based threading</li>
<li><code>char * openblas_get_config()</code> returns the options OpenBLAS was built with, something like <code>NO_LAPACKE DYNAMIC_ARCH NO_AFFINITY Haswell</code></li>
<li><code>int openblas_set_affinity(int thread_index, size_t cpusetsize, cpu_set_t *cpuset)</code> sets the cpu affinity mask of the given thread to the provided cpuset. (Only available under Linux, with semantics identical to pthread_setaffinity_np)</li>
</ul>


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