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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [DAGCombiner] Remove reduceBuildVecConvertToConvertBuildVec and rely on the vectorizers instead"
href="https://bugs.llvm.org/show_bug.cgi?id=35732">35732</a>
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<th>Summary</th>
<td>[DAGCombiner] Remove reduceBuildVecConvertToConvertBuildVec and rely on the vectorizers instead
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<th>Product</th>
<td>libraries
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<th>Version</th>
<td>trunk
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>Windows NT
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Common Code Generator Code
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>llvm-dev@redking.me.uk
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<th>CC</th>
<td>efriedma@codeaurora.org, hfinkel@anl.gov, llvm-bugs@lists.llvm.org, michael.hliao@gmail.com, spatel+llvm@rotateright.com
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<pre>reduceBuildVecConvertToConvertBuildVec vectorizes int2float in the DAGCombiner,
which means that even if the LV/SLP has decided to keep scalar code, this will
override this.
While there are cases where vectorization is necessary in the DAG (mainly due
to legalization artefacts), I don't think this is the case here. I think we
should get rid of this and instead assume that the vectorizers know what they
are doing.
SVN blame says this code was added back in 2012.</pre>
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