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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [PPC] Value of local variable corrupted with `__builtin_setjmp`"
href="https://bugs.llvm.org/show_bug.cgi?id=50234">50234</a>
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<th>Summary</th>
<td>[PPC] Value of local variable corrupted with `__builtin_setjmp`
</td>
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<th>Product</th>
<td>new-bugs
</td>
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<th>Version</th>
<td>11.0
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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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
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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>xtkoba@gmail.com
</td>
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<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=24831" name="attach_24831" title="Repro">attachment 24831</a> <a href="attachment.cgi?id=24831&action=edit" title="Repro">[details]</a></span>
Repro
The attached C program (named ppc_bsjlj.c) behaves incorrectly when compiled
with optimization level -O1 or higher for PPC targets.
For 32-bit PPC
$ clang --target=powerpc-unknown-linux-gnu -O3 -c ppc_bsjlj.c
results in the output
value = 268566576
value = 268566596
where the two lines should be identical.
Similarly, for ppc64le
$ clang --target=powerpc64le-unknown-linux-gnu -O3 -c ppc_bsjlj.c
results in
value = 268566608
value = 268566648
Note that in the program the value of the local variable `n` is not changed
between `__builtin_setjmp` and the corresponding `__builtin_longjmp`. Indeed it
is const-qualified.</pre>
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