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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - wasm32: Slowdown with large amount of relocations (?)"
href="https://bugs.llvm.org/show_bug.cgi?id=38650">38650</a>
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<th>Summary</th>
<td>wasm32: Slowdown with large amount of relocations (?)
</td>
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<th>Product</th>
<td>lld
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>All Bugs
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>alex@crichton.co
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org, sbc@chromium.org
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<div>
<pre>When working with some wasm tools earlier today I realized that for one of our
compilations in rust-lang/rust it takes LLD around 4 seconds to finish. I was
quite surprised at this runtime because typically our linker invocations are
quite speedy (under 1s most of the time, even non-incremental).
A gist [1] contains a tarball with a reproduction script and all the necessary
files and there's also a direct link [2] to the tarball itself.
I do realize though that this is quite a large test case, there's ~100MB of
input files which is generating ~20MB of an output. I suspect though that there
may be some low hanging fruit to clear out though to improve link time here!
[1]: <a href="https://gist.github.com/alexcrichton/cd4736e3faebbc7e45609a8b82a77d2a">https://gist.github.com/alexcrichton/cd4736e3faebbc7e45609a8b82a77d2a</a>
[2]:
<a href="https://gist.github.com/alexcrichton/cd4736e3faebbc7e45609a8b82a77d2a/raw/e92638fb6f6706c7ada3567e232358cba00993b8/slow-lld-invocation.tar.xz">https://gist.github.com/alexcrichton/cd4736e3faebbc7e45609a8b82a77d2a/raw/e92638fb6f6706c7ada3567e232358cba00993b8/slow-lld-invocation.tar.xz</a></pre>
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