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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Assertion `Op.hasOneUse() && "Unknown reuse!"'"
href="https://bugs.llvm.org/show_bug.cgi?id=41271">41271</a>
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<th>Summary</th>
<td>Assertion `Op.hasOneUse() && "Unknown reuse!"'
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<th>Product</th>
<td>libraries
</td>
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<th>Version</th>
<td>6.0
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
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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>GlobalISel
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>konstantin.vladimirov@gmail.com
</td>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org, quentin.colombet@gmail.com
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<pre>Following simple test:
float a;
char b;
int c() { b = a * -a * (-a * -a * 0); return b; }
crashes clang 6.0 in assertion
<span class="quote">> clang -S minimize.c</span >
clang-6.0: /srcs/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp:731:
llvm::SDValue GetNegatedExpression(llvm::SDValue, llvm::SelectionDAG&, bool,
unsigned int): Assertion `Op.hasOneUse() && "Unknown reuse!"' failed.
Compiler information:
<span class="quote">> clang -v</span >
clang version 6.0.0 (tags/RELEASE_600/final)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /apps/clang/6.0.0//bin
Selected GCC installation: /usr/lib64/gcc/x86_64-suse-linux/4.3
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Selected multilib: .;@m64</pre>
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