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<a href="gather__axis_8h.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno"> 1</span><span class="comment">// Copyright © 2025 Apple Inc.</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno"> 2</span> </div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno"> 3</span><span class="preprocessor">#pragma once</span></div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno"> 4</span> </div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno"> 5</span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> T, <span class="keyword">typename</span> IdxT, <span class="keyword">typename</span> LocT, <span class="keywordtype">bool</span> SrcC, <span class="keywordtype">bool</span> IdxC&gt;</div>
<div class="foldopen" id="foldopen00006" data-start="{" data-end="}">
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno"><a class="line" href="gather__axis_8h.html#a0d7d3866afe2007e280781502dc767c6"> 6</a></span>[[kernel]] <span class="keywordtype">void</span> <a class="code hl_function" href="gather__axis_8h.html#a0d7d3866afe2007e280781502dc767c6">gather_axis</a>(</div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno"> 7</span> <span class="keyword">const</span> device T* src [[buffer(0)]],</div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno"> 8</span> <span class="keyword">const</span> device IdxT* indices [[buffer(1)]],</div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno"> 9</span> device T* out [[buffer(2)]],</div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno"> 10</span> <span class="keyword">const</span> constant <span class="keywordtype">int</span>* shape [[buffer(3)]],</div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno"> 11</span> <span class="keyword">const</span> constant int64_t* src_strides [[buffer(4)]],</div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno"> 12</span> <span class="keyword">const</span> constant int64_t* idx_strides [[buffer(5)]],</div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno"> 13</span> <span class="keyword">const</span> constant <span class="keywordtype">size_t</span>&amp; ndim [[buffer(6)]],</div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno"> 14</span> <span class="keyword">const</span> constant <span class="keywordtype">int</span>&amp; axis [[buffer(7)]],</div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno"> 15</span> <span class="keyword">const</span> constant <span class="keywordtype">int</span>&amp; axis_size [[buffer(8)]],</div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno"> 16</span> <span class="keyword">const</span> constant <span class="keywordtype">size_t</span>&amp; src_ax_stride [[buffer(9)]],</div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno"> 17</span> <span class="keyword">const</span> constant <span class="keywordtype">size_t</span>&amp; idx_ax_stride [[buffer(10)]],</div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno"> 18</span> uint3 index [[thread_position_in_grid]],</div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno"> 19</span> uint3 grid_dim [[threads_per_grid]]) {</div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno"> 20</span> LocT elem_idx = index.z * <span class="keyword">static_cast&lt;</span>LocT<span class="keyword">&gt;</span>(grid_dim.x);</div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</span> LocT out_idx = elem_idx * grid_dim.y + index.x;</div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno"> 22</span> </div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno"> 23</span> LocT idx_loc = index.y * <span class="keyword">static_cast&lt;</span>LocT<span class="keyword">&gt;</span>(idx_ax_stride);</div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno"> 24</span> <span class="keywordflow">if</span> (IdxC) {</div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno"> 25</span> idx_loc += out_idx;</div>
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno"> 26</span> } <span class="keywordflow">else</span> {</div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno"> 27</span> idx_loc += <a class="code hl_function" href="backend_2metal_2kernels_2utils_8h.html#a497dd9f1a00c8a4303d8782158a0812a">elem_to_loc&lt;LocT&gt;</a>(elem_idx + index.x, shape, idx_strides, ndim);</div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno"> 28</span> }</div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno"> 29</span> </div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span> <span class="keyword">auto</span> idx_val = indices[idx_loc];</div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span> <span class="keywordflow">if</span> (is_signed_v&lt;IdxT&gt;) {</div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno"> 32</span> idx_val = (idx_val &lt; 0) ? idx_val + axis_size : idx_val;</div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span> }</div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno"> 34</span> </div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno"> 35</span> LocT src_idx = idx_val * <span class="keyword">static_cast&lt;</span>LocT<span class="keyword">&gt;</span>(src_ax_stride);</div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno"> 36</span> <span class="keywordflow">if</span> (SrcC) {</div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"> 37</span> src_idx += elem_idx * axis_size + index.x;</div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span> } <span class="keywordflow">else</span> {</div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span> src_idx += <a class="code hl_function" href="backend_2metal_2kernels_2utils_8h.html#a497dd9f1a00c8a4303d8782158a0812a">elem_to_loc&lt;LocT&gt;</a>(elem_idx + index.x, shape, src_strides, ndim);</div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno"> 40</span> }</div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno"> 41</span> </div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"> 42</span> out_idx += index.y * <span class="keyword">static_cast&lt;</span>LocT<span class="keyword">&gt;</span>(grid_dim.x);</div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span> out[out_idx] = src[src_idx];</div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span>}</div>
</div>
<div class="ttc" id="abackend_2metal_2kernels_2utils_8h_html_a497dd9f1a00c8a4303d8782158a0812a"><div class="ttname"><a href="backend_2metal_2kernels_2utils_8h.html#a497dd9f1a00c8a4303d8782158a0812a">elem_to_loc</a></div><div class="ttdeci">METAL_FUNC IdxT elem_to_loc(IdxT elem, constant const int *shape, constant const int64_t *strides, int ndim)</div><div class="ttdef"><b>Definition</b> utils.h:93</div></div>
<div class="ttc" id="agather__axis_8h_html_a0d7d3866afe2007e280781502dc767c6"><div class="ttname"><a href="gather__axis_8h.html#a0d7d3866afe2007e280781502dc767c6">gather_axis</a></div><div class="ttdeci">void gather_axis(const device T *src, const device IdxT *indices, device T *out, const constant int *shape, const constant int64_t *src_strides, const constant int64_t *idx_strides, const constant size_t &amp;ndim, const constant int &amp;axis, const constant int &amp;axis_size, const constant size_t &amp;src_ax_stride, const constant size_t &amp;idx_ax_stride, uint3 index, uint3 grid_dim)</div><div class="ttdef"><b>Definition</b> gather_axis.h:6</div></div>
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