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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [SimplifyCFG] produces incorrect callbr's"
href="https://bugs.llvm.org/show_bug.cgi?id=43222">43222</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>[SimplifyCFG] produces incorrect callbr's
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Transformation Utilities
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>ndesaulniers@google.com
</td>
</tr>
<tr>
<th>CC</th>
<td>craig.topper@gmail.com, llvm-bugs@lists.llvm.org, natechancellor@gmail.com, srhines@google.com
</td>
</tr>
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<th>Blocks</th>
<td>4068
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=22471" name="attach_22471" title="z.ll">attachment 22471</a> <a href="attachment.cgi?id=22471&action=edit" title="z.ll">[details]</a></span>
z.ll
With the attached test case, and new verifier check from
(<a href="https://reviews.llvm.org/D67196">https://reviews.llvm.org/D67196</a>) I observe a failure in SimplifyCFG:
$ opt --simplifycfg z.ll -o /dev/null
Indirect label missing from arglist.
callbr void asm sideeffect "// XXX: ${0:l}", "X"(i8* blockaddress(@andy_test,
%if.then))
to label %land.rhs.i [label %if.end]
in function andy_test
LLVM ERROR: Broken function found, compilation aborted!
the indirect label list `[label %if.end]`.
Attaching z2.ll, which is the post-simplyifycfg-ed version that violates the
invariant.
Looks like a simple phi is being replaced:
branch_test.exit: ; preds = %entry, %land.rhs.i
%0 = phi i1 [ true, %entry ], [ false, %land.rhs.i ]
br i1 %0, label %if.end, label %if.then
where the blockaddress of %if.then is being updated correctly, but the indirect
label list is not.</pre>
</div>
</p>
<div id="referenced">
<hr style="border: 1px dashed #969696">
<b>Referenced Bugs:</b>
<ul>
<li>
[<a class="bz_bug_link
bz_status_CONFIRMED "
title="CONFIRMED - [Meta] Compiling the Linux kernel with clang"
href="https://bugs.llvm.org/show_bug.cgi?id=4068">Bug 4068</a>] [Meta] Compiling the Linux kernel with clang
</li>
</ul>
</div>
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