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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [X86] Can we not skip ZEXT's, not only SEXT's, for GATHER's?"
href="https://bugs.llvm.org/show_bug.cgi?id=51984">51984</a>
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<th>Summary</th>
<td>[X86] Can we not skip ZEXT's, not only SEXT's, for GATHER's?
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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>Linux
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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>Backend: X86
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>lebedev.ri@gmail.com
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<th>CC</th>
<td>craig.topper@gmail.com, llvm-bugs@lists.llvm.org, llvm-dev@redking.me.uk, pengfei.wang@intel.com, spatel+llvm@rotateright.com
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<pre>I was trying to evaluate if znver3 should be marked
as having fast gathers (i believe it should me.),
and stumbled into this:
<a href="https://godbolt.org/z/r5qPnMsWj">https://godbolt.org/z/r5qPnMsWj</a>
It's pretty expected that we split the GATHER
because the index is too wide, iff we can't tell that we can narrow it,
but can we not narrow the ZEXT just like we do SEXT?</pre>
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