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<p>Hi,</p>
<p>I contribute to the LLVM compiler (<a class="moz-txt-link-freetext" href="https://llvm.org">https://llvm.org</a>) and my
recent work has been to uncover and fix instances of <b>non-determinism
in LLVM</b>.</p>
<p>I recently presented a poster titled <i>"Non-determinism in LLVM
Code Generation"</i> at this year's LLVM Dev Meet: <i><a class="moz-txt-link-freetext" href="https://github.com/mgrang/non-determinism/blob/master/poster_non_determinism_llvm_codegen.pdf">https://github.com/mgrang/non-determinism/blob/master/poster_non_determinism_llvm_codegen.pdf</a></i></p>
<p>It would be great to know if my work is of interest to the
reproducible builds community and if someone has already
done/doing something similar.<br>
</p>
<p>Here is an abstract of my work:</p>
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<p class="MsoCommentText"><i><span style="font-size:11.0pt">The
code generation
phase in LLVM suffers from the problem of non-determinism.
This means that the
same input program might have different object code
generated depending on the
way the LLVM toolchain was built. We might get different
output between release
only and release plus asserts builds, between a Windows and
a Linux build or
even different back-to-back runs of the same toolchain.</span></i></p>
<i>
</i>
<p class="MsoCommentText"><i><span style="font-size:11.0pt">While
the generated code
might not necessarily be “wrong code”, this non-determinism
might result in
unexpected runtime crashes or simply hard to reproduce bugs
on the customer
side making it harder to debug and fix.</span></i></p>
<i>
</i>
<p class="MsoNormal"><i>A common cause of non-determinism is the
iteration of
unordered containers in LLVM. Many such cases of
non-deterministic behavior can
be uncovered by forcing reverse iteration of these unordered
containers and checking
if the generated code changes. Reverse iteration simply means
reversing the
direction of iteration of a container. It is transparent to
the user and comes
with almost zero runtime cost.</i></p>
<i>
</i>
<p class="MsoNormal"><i>Our reverse iteration technique is
currently implemented for
SmallPtrSet, DenseMap and DenseSet and it already uncovers
problems that resulted in the failure of
several test cases in LLVM. We plan to extend this work by
including more
containers in the test and providing further analysis.</i></p>
</p>
<p>Thanks,</p>
<p>Mandeep<br>
</p>
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