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<div class="headertitle"><div class="title">reduce_col.h File Reference</div></div>
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<p><a href="reduce__col_8h_source.html">Go to the source code of this file.</a></p>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="func-members" name="func-members"></a>
Functions</h2></td></tr>
<tr class="memitem:a674f4b6075bab1b89778e10ab24c557e" id="r_a674f4b6075bab1b89778e10ab24c557e"><td class="memTemplParams" colspan="2">template&lt;typename T, typename U, typename Op, typename IdxT, int NDIMS&gt; </td></tr>
<tr class="memitem:a674f4b6075bab1b89778e10ab24c557e"><td class="memTemplItemLeft" align="right" valign="top">void&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="#a674f4b6075bab1b89778e10ab24c557e">col_reduce_small</a> (const device T *in, device U *out, const constant size_t &amp;reduction_size, const constant int64_t &amp;reduction_stride, const constant int *shape, const constant int64_t *strides, const constant int &amp;ndim, const constant int *reduce_shape, const constant int64_t *reduce_strides, const constant int &amp;reduce_ndim, const constant size_t &amp;non_col_reductions, uint3 gid, uint3 gsize, uint3 lid, uint3 lsize)</td></tr>
<tr class="separator:a674f4b6075bab1b89778e10ab24c557e"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a00bb1ed154aef8c1d2cb15d0c4231a51" id="r_a00bb1ed154aef8c1d2cb15d0c4231a51"><td class="memTemplParams" colspan="2">template&lt;typename T, typename U, typename Op, typename IdxT, int NDIMS&gt; </td></tr>
<tr class="memitem:a00bb1ed154aef8c1d2cb15d0c4231a51"><td class="memTemplItemLeft" align="right" valign="top">void&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="#a00bb1ed154aef8c1d2cb15d0c4231a51">col_reduce_longcolumn</a> (const device T *in, device U *out, const constant size_t &amp;reduction_size, const constant size_t &amp;reduction_stride, const constant int *shape, const constant int64_t *strides, const constant int &amp;ndim, const constant int *reduce_shape, const constant int64_t *reduce_strides, const constant int &amp;reduce_ndim, const constant size_t &amp;non_col_reductions, const constant size_t &amp;out_size, uint3 gid, uint3 gsize, uint3 lid, uint3 lsize)</td></tr>
<tr class="separator:a00bb1ed154aef8c1d2cb15d0c4231a51"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a59be8d8c4bca2217f62ea868550393c0" id="r_a59be8d8c4bca2217f62ea868550393c0"><td class="memTemplParams" colspan="2">template&lt;typename T, typename U, typename Op, typename IdxT, int NDIMS, int BM, int BN&gt; </td></tr>
<tr class="memitem:a59be8d8c4bca2217f62ea868550393c0"><td class="memTemplItemLeft" align="right" valign="top">void&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="#a59be8d8c4bca2217f62ea868550393c0">col_reduce_looped</a> (const device T *in, device U *out, const constant size_t &amp;reduction_size, const constant int64_t &amp;reduction_stride, const constant int *shape, const constant int64_t *strides, const constant int &amp;ndim, const constant int *reduce_shape, const constant int64_t *reduce_strides, const constant int &amp;reduce_ndim, const constant size_t &amp;non_col_reductions, uint3 gid, uint3 gsize, uint simd_lane_id, uint simd_group_id)</td></tr>
<tr class="memdesc:a59be8d8c4bca2217f62ea868550393c0"><td class="mdescLeft">&#160;</td><td class="mdescRight">Our approach is the following simple looped approach: <br /></td></tr>
<tr class="separator:a59be8d8c4bca2217f62ea868550393c0"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a5a3d4847e4ae940d3a532d790c0b9b27" id="r_a5a3d4847e4ae940d3a532d790c0b9b27"><td class="memTemplParams" colspan="2">template&lt;typename T, typename U, typename Op, typename IdxT, int NDIMS, int BM, int BN&gt; </td></tr>
<tr class="memitem:a5a3d4847e4ae940d3a532d790c0b9b27"><td class="memTemplItemLeft" align="right" valign="top">void&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="#a5a3d4847e4ae940d3a532d790c0b9b27">col_reduce_2pass</a> (const device T *in, device U *out, const constant size_t &amp;reduction_size, const constant int64_t &amp;reduction_stride, const constant int *shape, const constant int64_t *strides, const constant int &amp;ndim, const constant int *reduce_shape, const constant int64_t *reduce_strides, const constant int &amp;reduce_ndim, const constant size_t &amp;non_col_reductions, const constant size_t &amp;out_size, uint3 gid, uint3 gsize, uint simd_lane_id, uint simd_group_id)</td></tr>
<tr class="separator:a5a3d4847e4ae940d3a532d790c0b9b27"><td class="memSeparator" colspan="2">&#160;</td></tr>
</table>
<h2 class="groupheader">Function Documentation</h2>
<a id="a5a3d4847e4ae940d3a532d790c0b9b27" name="a5a3d4847e4ae940d3a532d790c0b9b27"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a5a3d4847e4ae940d3a532d790c0b9b27">&#9670;&#160;</a></span>col_reduce_2pass()</h2>
<div class="memitem">
<div class="memproto">
<div class="memtemplate">
template&lt;typename T, typename U, typename Op, typename IdxT, int NDIMS, int BM, int BN&gt; </div>
<table class="memname">
<tr>
<td class="memname">void col_reduce_2pass </td>
<td>(</td>
<td class="paramtype">const device T *</td> <td class="paramname"><span class="paramname"><em>in</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">device U *</td> <td class="paramname"><span class="paramname"><em>out</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const constant size_t &amp;</td> <td class="paramname"><span class="paramname"><em>reduction_size</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const constant int64_t &amp;</td> <td class="paramname"><span class="paramname"><em>reduction_stride</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const constant int *</td> <td class="paramname"><span class="paramname"><em>shape</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const constant int64_t *</td> <td class="paramname"><span class="paramname"><em>strides</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const constant int &amp;</td> <td class="paramname"><span class="paramname"><em>ndim</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const constant int *</td> <td class="paramname"><span class="paramname"><em>reduce_shape</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const constant int64_t *</td> <td class="paramname"><span class="paramname"><em>reduce_strides</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const constant int &amp;</td> <td class="paramname"><span class="paramname"><em>reduce_ndim</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const constant size_t &amp;</td> <td class="paramname"><span class="paramname"><em>non_col_reductions</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const constant size_t &amp;</td> <td class="paramname"><span class="paramname"><em>out_size</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint3</td> <td class="paramname"><span class="paramname"><em>gid</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint3</td> <td class="paramname"><span class="paramname"><em>gsize</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint</td> <td class="paramname"><span class="paramname"><em>simd_lane_id</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint</td> <td class="paramname"><span class="paramname"><em>simd_group_id</em></span>&#160;)</td>
</tr>
</table>
</div><div class="memdoc">
</div>
</div>
<a id="a00bb1ed154aef8c1d2cb15d0c4231a51" name="a00bb1ed154aef8c1d2cb15d0c4231a51"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a00bb1ed154aef8c1d2cb15d0c4231a51">&#9670;&#160;</a></span>col_reduce_longcolumn()</h2>
<div class="memitem">
<div class="memproto">
<div class="memtemplate">
template&lt;typename T, typename U, typename Op, typename IdxT, int NDIMS&gt; </div>
<table class="memname">
<tr>
<td class="memname">void col_reduce_longcolumn </td>
<td>(</td>
<td class="paramtype">const device T *</td> <td class="paramname"><span class="paramname"><em>in</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">device U *</td> <td class="paramname"><span class="paramname"><em>out</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const constant size_t &amp;</td> <td class="paramname"><span class="paramname"><em>reduction_size</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const constant size_t &amp;</td> <td class="paramname"><span class="paramname"><em>reduction_stride</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const constant int *</td> <td class="paramname"><span class="paramname"><em>shape</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const constant int64_t *</td> <td class="paramname"><span class="paramname"><em>strides</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const constant int &amp;</td> <td class="paramname"><span class="paramname"><em>ndim</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const constant int *</td> <td class="paramname"><span class="paramname"><em>reduce_shape</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const constant int64_t *</td> <td class="paramname"><span class="paramname"><em>reduce_strides</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const constant int &amp;</td> <td class="paramname"><span class="paramname"><em>reduce_ndim</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const constant size_t &amp;</td> <td class="paramname"><span class="paramname"><em>non_col_reductions</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const constant size_t &amp;</td> <td class="paramname"><span class="paramname"><em>out_size</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint3</td> <td class="paramname"><span class="paramname"><em>gid</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint3</td> <td class="paramname"><span class="paramname"><em>gsize</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint3</td> <td class="paramname"><span class="paramname"><em>lid</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint3</td> <td class="paramname"><span class="paramname"><em>lsize</em></span>&#160;)</td>
</tr>
</table>
</div><div class="memdoc">
</div>
</div>
<a id="a59be8d8c4bca2217f62ea868550393c0" name="a59be8d8c4bca2217f62ea868550393c0"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a59be8d8c4bca2217f62ea868550393c0">&#9670;&#160;</a></span>col_reduce_looped()</h2>
<div class="memitem">
<div class="memproto">
<div class="memtemplate">
template&lt;typename T, typename U, typename Op, typename IdxT, int NDIMS, int BM, int BN&gt; </div>
<table class="memname">
<tr>
<td class="memname">void col_reduce_looped </td>
<td>(</td>
<td class="paramtype">const device T *</td> <td class="paramname"><span class="paramname"><em>in</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">device U *</td> <td class="paramname"><span class="paramname"><em>out</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const constant size_t &amp;</td> <td class="paramname"><span class="paramname"><em>reduction_size</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const constant int64_t &amp;</td> <td class="paramname"><span class="paramname"><em>reduction_stride</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const constant int *</td> <td class="paramname"><span class="paramname"><em>shape</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const constant int64_t *</td> <td class="paramname"><span class="paramname"><em>strides</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const constant int &amp;</td> <td class="paramname"><span class="paramname"><em>ndim</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const constant int *</td> <td class="paramname"><span class="paramname"><em>reduce_shape</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const constant int64_t *</td> <td class="paramname"><span class="paramname"><em>reduce_strides</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const constant int &amp;</td> <td class="paramname"><span class="paramname"><em>reduce_ndim</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const constant size_t &amp;</td> <td class="paramname"><span class="paramname"><em>non_col_reductions</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint3</td> <td class="paramname"><span class="paramname"><em>gid</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint3</td> <td class="paramname"><span class="paramname"><em>gsize</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint</td> <td class="paramname"><span class="paramname"><em>simd_lane_id</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint</td> <td class="paramname"><span class="paramname"><em>simd_group_id</em></span>&#160;)</td>
</tr>
</table>
</div><div class="memdoc">
<p>Our approach is the following simple looped approach: </p>
<ol type="1">
<li>Each thread keeps running totals for BN / n_simdgroups outputs.</li>
<li>Load a tile BM, BN in registers and accumulate in the running totals</li>
<li>Move ahead by BM steps until the column axis and the non column reductions are exhausted.</li>
<li>If BM == 32 then transpose in SM and simd reduce the running totals. Otherwise write in shared memory and BN threads accumulate the running totals with a loop.</li>
<li>Write them to the output </li>
</ol>
</div>
</div>
<a id="a674f4b6075bab1b89778e10ab24c557e" name="a674f4b6075bab1b89778e10ab24c557e"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a674f4b6075bab1b89778e10ab24c557e">&#9670;&#160;</a></span>col_reduce_small()</h2>
<div class="memitem">
<div class="memproto">
<div class="memtemplate">
template&lt;typename T, typename U, typename Op, typename IdxT, int NDIMS&gt; </div>
<table class="memname">
<tr>
<td class="memname">void col_reduce_small </td>
<td>(</td>
<td class="paramtype">const device T *</td> <td class="paramname"><span class="paramname"><em>in</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">device U *</td> <td class="paramname"><span class="paramname"><em>out</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const constant size_t &amp;</td> <td class="paramname"><span class="paramname"><em>reduction_size</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const constant int64_t &amp;</td> <td class="paramname"><span class="paramname"><em>reduction_stride</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const constant int *</td> <td class="paramname"><span class="paramname"><em>shape</em></span>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">const constant int64_t *</td> <td class="paramname"><span class="paramname"><em>strides</em></span>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">const constant int &amp;</td> <td class="paramname"><span class="paramname"><em>ndim</em></span>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">const constant int *</td> <td class="paramname"><span class="paramname"><em>reduce_shape</em></span>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">const constant int64_t *</td> <td class="paramname"><span class="paramname"><em>reduce_strides</em></span>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">const constant int &amp;</td> <td class="paramname"><span class="paramname"><em>reduce_ndim</em></span>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">const constant size_t &amp;</td> <td class="paramname"><span class="paramname"><em>non_col_reductions</em></span>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint3</td> <td class="paramname"><span class="paramname"><em>gid</em></span>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint3</td> <td class="paramname"><span class="paramname"><em>gsize</em></span>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint3</td> <td class="paramname"><span class="paramname"><em>lid</em></span>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint3</td> <td class="paramname"><span class="paramname"><em>lsize</em></span>&#160;)</td>
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