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<span id="amdgpu-synid-gfx90a-imask"></span><h1>imask<a class="headerlink" href="#imask" title="Permalink to this headline">¶</a></h1>
<p>This operand is a mask which controls indexing mode for operands of subsequent instructions.
Bits 0, 1 and 2 control indexing of <em>src0</em>, <em>src1</em> and <em>src2</em>, while bit 3 controls indexing of <em>dst</em>.
Value 1 enables indexing and value 0 disables it.</p>
<blockquote>
<div><table class="docutils align-default">
<colgroup>
<col style="width: 11%" />
<col style="width: 89%" />
</colgroup>
<thead>
<tr class="row-odd"><th class="head"><p>Bit</p></th>
<th class="head"><p>Meaning</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p>0</p></td>
<td><p>Enables or disables <em>src0</em> indexing.</p></td>
</tr>
<tr class="row-odd"><td><p>1</p></td>
<td><p>Enables or disables <em>src1</em> indexing.</p></td>
</tr>
<tr class="row-even"><td><p>2</p></td>
<td><p>Enables or disables <em>src2</em> indexing.</p></td>
</tr>
<tr class="row-odd"><td><p>3</p></td>
<td><p>Enables or disables <em>dst</em> indexing.</p></td>
</tr>
</tbody>
</table>
</div></blockquote>
<p>This operand may be specified as one of the following:</p>
<ul>
<li><p>An <a class="reference internal" href="../AMDGPUOperandSyntax.html#amdgpu-synid-integer-number"><span class="std std-ref">integer_number</span></a> or an <a class="reference internal" href="../AMDGPUOperandSyntax.html#amdgpu-synid-absolute-expression"><span class="std std-ref">absolute_expression</span></a>. The value must be in the range 0..15.</p></li>
<li><p>A <em>gpr_idx</em> value described below.</p>
<blockquote>
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<col style="width: 46%" />
<col style="width: 54%" />
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<tr class="row-odd"><th class="head"><p>Gpr_idx Value Syntax</p></th>
<th class="head"><p>Description</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p>gpr_idx(<em><operands></em>)</p></td>
<td><p>Enable indexing for specified <em>operands</em>
and disable it for the rest.
<em>Operands</em> is a comma-separated list of
values which may include:</p>
<ul class="simple">
<li><p>“SRC0” - enable <em>src0</em> indexing.</p></li>
<li><p>“SRC1” - enable <em>src1</em> indexing.</p></li>
<li><p>“SRC2” - enable <em>src2</em> indexing.</p></li>
<li><p>“DST” - enable <em>dst</em> indexing.</p></li>
</ul>
<p>Each of these values may be specified only
once.</p>
<p><em>Operands</em> list may be empty; this syntax
disables indexing for all operands.</p>
</td>
</tr>
</tbody>
</table>
</div></blockquote>
</li>
</ul>
<p>Examples:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">s_set_gpr_idx_mode</span> <span class="mi">0</span>
<span class="n">s_set_gpr_idx_mode</span> <span class="n">gpr_idx</span><span class="p">()</span> <span class="o">//</span> <span class="n">the</span> <span class="n">same</span> <span class="k">as</span> <span class="n">above</span>
<span class="n">s_set_gpr_idx_mode</span> <span class="mi">15</span>
<span class="n">s_set_gpr_idx_mode</span> <span class="n">gpr_idx</span><span class="p">(</span><span class="n">DST</span><span class="p">,</span><span class="n">SRC0</span><span class="p">,</span><span class="n">SRC1</span><span class="p">,</span><span class="n">SRC2</span><span class="p">)</span> <span class="o">//</span> <span class="n">the</span> <span class="n">same</span> <span class="k">as</span> <span class="n">above</span>
<span class="n">s_set_gpr_idx_mode</span> <span class="n">gpr_idx</span><span class="p">(</span><span class="n">SRC0</span><span class="p">,</span><span class="n">SRC1</span><span class="p">,</span><span class="n">SRC2</span><span class="p">,</span><span class="n">DST</span><span class="p">)</span> <span class="o">//</span> <span class="n">the</span> <span class="n">same</span> <span class="k">as</span> <span class="n">above</span>
<span class="n">s_set_gpr_idx_mode</span> <span class="n">gpr_idx</span><span class="p">(</span><span class="n">DST</span><span class="p">,</span><span class="n">SRC1</span><span class="p">)</span>
</pre></div>
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