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| <div class="subTitle">org.apache.sysds.hops.rewrite</div> |
| <h2 title="Class RewriteRemoveUnnecessaryCasts" class="title">Class RewriteRemoveUnnecessaryCasts</h2> |
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| <li><a href="../../../../../org/apache/sysds/hops/rewrite/HopRewriteRule.html" title="class in org.apache.sysds.hops.rewrite">org.apache.sysds.hops.rewrite.HopRewriteRule</a></li> |
| <li> |
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| <li>org.apache.sysds.hops.rewrite.RewriteRemoveUnnecessaryCasts</li> |
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| <pre>public class <span class="typeNameLabel">RewriteRemoveUnnecessaryCasts</span> |
| extends <a href="../../../../../org/apache/sysds/hops/rewrite/HopRewriteRule.html" title="class in org.apache.sysds.hops.rewrite">HopRewriteRule</a></pre> |
| <div class="block">Rule: RemoveUnnecessaryCasts. For all value type casts check |
| if they are really necessary. If both cast input and output |
| type are the same, the cast itself is redundant. |
| |
| There are two use case where this can arise: (1) automatically |
| inserted casts on function inlining (in case of unknown value |
| types), and (2) explicit script-level value type casts, that |
| might be redundant according to the read input data. |
| |
| The benefit of this rewrite is negligible for scalars. However, |
| when we support matrices with different value types, those casts |
| might refer to matrices and with that incur large costs.</div> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/sysds/hops/rewrite/RewriteRemoveUnnecessaryCasts.html#RewriteRemoveUnnecessaryCasts--">RewriteRemoveUnnecessaryCasts</a></span>()</code> </td> |
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| <td class="colFirst"><code><a href="../../../../../org/apache/sysds/hops/Hop.html" title="class in org.apache.sysds.hops">Hop</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/sysds/hops/rewrite/RewriteRemoveUnnecessaryCasts.html#rewriteHopDAG-org.apache.sysds.hops.Hop-org.apache.sysds.hops.rewrite.ProgramRewriteStatus-">rewriteHopDAG</a></span>(<a href="../../../../../org/apache/sysds/hops/Hop.html" title="class in org.apache.sysds.hops">Hop</a> root, |
| <a href="../../../../../org/apache/sysds/hops/rewrite/ProgramRewriteStatus.html" title="class in org.apache.sysds.hops.rewrite">ProgramRewriteStatus</a> state)</code> |
| <div class="block">Handle a predicate hop DAG with exactly one root.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/ArrayList.html?is-external=true" title="class or interface in java.util">ArrayList</a><<a href="../../../../../org/apache/sysds/hops/Hop.html" title="class in org.apache.sysds.hops">Hop</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/sysds/hops/rewrite/RewriteRemoveUnnecessaryCasts.html#rewriteHopDAGs-java.util.ArrayList-org.apache.sysds.hops.rewrite.ProgramRewriteStatus-">rewriteHopDAGs</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/ArrayList.html?is-external=true" title="class or interface in java.util">ArrayList</a><<a href="../../../../../org/apache/sysds/hops/Hop.html" title="class in org.apache.sysds.hops">Hop</a>> roots, |
| <a href="../../../../../org/apache/sysds/hops/rewrite/ProgramRewriteStatus.html" title="class in org.apache.sysds.hops.rewrite">ProgramRewriteStatus</a> state)</code> |
| <div class="block">Handle a generic (last-level) hop DAG with multiple roots.</div> |
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| <a name="RewriteRemoveUnnecessaryCasts--"> |
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| <h4>RewriteRemoveUnnecessaryCasts</h4> |
| <pre>public RewriteRemoveUnnecessaryCasts()</pre> |
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| <h3>Method Detail</h3> |
| <a name="rewriteHopDAGs-java.util.ArrayList-org.apache.sysds.hops.rewrite.ProgramRewriteStatus-"> |
| <!-- --> |
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| <ul class="blockList"> |
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| <h4>rewriteHopDAGs</h4> |
| <pre>public <a href="https://docs.oracle.com/javase/8/docs/api/java/util/ArrayList.html?is-external=true" title="class or interface in java.util">ArrayList</a><<a href="../../../../../org/apache/sysds/hops/Hop.html" title="class in org.apache.sysds.hops">Hop</a>> rewriteHopDAGs(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/ArrayList.html?is-external=true" title="class or interface in java.util">ArrayList</a><<a href="../../../../../org/apache/sysds/hops/Hop.html" title="class in org.apache.sysds.hops">Hop</a>> roots, |
| <a href="../../../../../org/apache/sysds/hops/rewrite/ProgramRewriteStatus.html" title="class in org.apache.sysds.hops.rewrite">ProgramRewriteStatus</a> state)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from class: <code><a href="../../../../../org/apache/sysds/hops/rewrite/HopRewriteRule.html#rewriteHopDAGs-java.util.ArrayList-org.apache.sysds.hops.rewrite.ProgramRewriteStatus-">HopRewriteRule</a></code></span></div> |
| <div class="block">Handle a generic (last-level) hop DAG with multiple roots.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../org/apache/sysds/hops/rewrite/HopRewriteRule.html#rewriteHopDAGs-java.util.ArrayList-org.apache.sysds.hops.rewrite.ProgramRewriteStatus-">rewriteHopDAGs</a></code> in class <code><a href="../../../../../org/apache/sysds/hops/rewrite/HopRewriteRule.html" title="class in org.apache.sysds.hops.rewrite">HopRewriteRule</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>roots</code> - high-level operator roots</dd> |
| <dd><code>state</code> - program rewrite status</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>list of high-level operators</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="rewriteHopDAG-org.apache.sysds.hops.Hop-org.apache.sysds.hops.rewrite.ProgramRewriteStatus-"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>rewriteHopDAG</h4> |
| <pre>public <a href="../../../../../org/apache/sysds/hops/Hop.html" title="class in org.apache.sysds.hops">Hop</a> rewriteHopDAG(<a href="../../../../../org/apache/sysds/hops/Hop.html" title="class in org.apache.sysds.hops">Hop</a> root, |
| <a href="../../../../../org/apache/sysds/hops/rewrite/ProgramRewriteStatus.html" title="class in org.apache.sysds.hops.rewrite">ProgramRewriteStatus</a> state)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from class: <code><a href="../../../../../org/apache/sysds/hops/rewrite/HopRewriteRule.html#rewriteHopDAG-org.apache.sysds.hops.Hop-org.apache.sysds.hops.rewrite.ProgramRewriteStatus-">HopRewriteRule</a></code></span></div> |
| <div class="block">Handle a predicate hop DAG with exactly one root.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../org/apache/sysds/hops/rewrite/HopRewriteRule.html#rewriteHopDAG-org.apache.sysds.hops.Hop-org.apache.sysds.hops.rewrite.ProgramRewriteStatus-">rewriteHopDAG</a></code> in class <code><a href="../../../../../org/apache/sysds/hops/rewrite/HopRewriteRule.html" title="class in org.apache.sysds.hops.rewrite">HopRewriteRule</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>root</code> - high-level operator root</dd> |
| <dd><code>state</code> - program rewrite status</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>high-level operator</dd> |
| </dl> |
| </li> |
| </ul> |
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