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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - optimization bug with -march=haswell/skylake"
href="https://bugs.llvm.org/show_bug.cgi?id=42885">42885</a>
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<th>Summary</th>
<td>optimization bug with -march=haswell/skylake
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>trunk
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<th>Hardware</th>
<td>All
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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>normal
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>-New Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>mail@hanicka.net
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<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=22337" name="attach_22337" title="Problematic example">attachment 22337</a> <a href="attachment.cgi?id=22337&action=edit" title="Problematic example">[details]</a></span>
Problematic example
Optimizer for attached code generate suboptimal assembly when
`-march=haswell/skylake` (maybe others too) provided.
Example: <a href="https://compiler-explorer.com/z/hILOvf">https://compiler-explorer.com/z/hILOvf</a>
But for another example the assembly is ok:
<a href="https://compiler-explorer.com/z/bdOObm">https://compiler-explorer.com/z/bdOObm</a>
Thanks, Hana</pre>
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