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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [GVN] Assertion "Cached first special instruction is wrong!""
href="https://bugs.llvm.org/show_bug.cgi?id=49193">49193</a>
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<th>Summary</th>
<td>[GVN] Assertion "Cached first special instruction is wrong!"
</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>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Scalar Optimizations
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>paulsson@linux.vnet.ibm.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=24529" name="attach_24529" title="reduced testcase">attachment 24529</a> <a href="attachment.cgi?id=24529&action=edit" title="reduced testcase">[details]</a></span>
reduced testcase
clang-12 -cc1 -triple s390x-ibm-linux -S -target-cpu arch13 -O3 -o out.ll
-emit-llvm -x ir tc_crash6_aftercreduce.ll
llvm/lib/Analysis/InstructionPrecedenceTracking.cpp:87: void
llvm::InstructionPrecedenceTracking::validate(const llvm::BasicBlock *) const:
Assertion `It->second == &Insn && "Cached first special instruction is wrong!"'
failed.
PLEASE submit a bug report to <a href="https://bugs.llvm.org/">https://bugs.llvm.org/</a> and include the crash
backtrace, preprocessed source, and associated run script.
Stack dump:
0. Program arguments: /home/ijonpan/llvm-project/build/bin/clang-12 -cc1
-triple s390x-ibm-linux -S -target-cpu arch13 -O3 -o out.ll -emit-llvm -x ir
tc_crash6_aftercreduce.ll
1. Per-module optimization passes
2. Running pass 'CallGraph Pass Manager' on module
'tc_crash6_aftercreduce.ll'.
3. Running pass 'Global Value Numbering' on function '@k'</pre>
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