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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Codegen for TLS variables calls __tls_get_info far too many times."
href="https://bugs.llvm.org/show_bug.cgi?id=33539">33539</a>
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<th>Summary</th>
<td>Codegen for TLS variables calls __tls_get_info far too many times.
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<th>Product</th>
<td>new-bugs
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<th>Version</th>
<td>4.0
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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
</td>
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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>new bugs
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>sstewartgallus00@mylangara.bc.ca
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<pre>Code like <a href="https://godbolt.org/g/JiSXBG">https://godbolt.org/g/JiSXBG</a> calls __tls_get_info a bunch of times
instead of just once.
This has to be explicitly worked around like in
<a href="https://sstewartgallus.com/git?p=weakrand.git;a=blob_plain;f=src/lib.rs;hb=HEAD">https://sstewartgallus.com/git?p=weakrand.git;a=blob_plain;f=src/lib.rs;hb=HEAD</a>
in order to only call __tls_get_info once.
This single optimization sped up one of my benchmarks from 220us to 210us in
some of my heavy concurrent code.</pre>
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