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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Assertion `Num < NumOperands && "Invalid child # of SDNode!"' failed with -O0 -march=skx."
href="https://bugs.llvm.org/show_bug.cgi?id=32284">32284</a>
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<tr>
<th>Summary</th>
<td>Assertion `Num < NumOperands && "Invalid child # of SDNode!"' failed with -O0 -march=skx.
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<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>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>Vsevolod.Livinskij@frtk.ru
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=18097" name="attach_18097" title="Reproducer.">attachment 18097</a> <a href="attachment.cgi?id=18097&action=edit" title="Reproducer.">[details]</a></span>
Reproducer.
Clang fails assertion during pass 'X86 DAG->DAG Instruction Selection' with -O0
-march=skx.
Reproducer:
extern const unsigned char c;
void foo() {
bool a = char(-long(-c));
int b = !!c <= c;
}
Error:
<span class="quote">>$ clang++ -O0 -march=skx -c repr.cpp</span >
llvm-trunk/include/llvm/CodeGen/SelectionDAGNodes.h:746: const llvm::SDValue&
llvm::SDNode::getOperand(unsigned int) const: Assertion `Num < NumOperands &&
"Invalid child # of SDNode!"' failed.
(......)
1. <eof> parser at end of file
2. Code generation
3. Running pass 'Function Pass Manager' on module 'repr.cpp'.
4. Running pass 'X86 DAG->DAG Instruction Selection' on function
'@_Z3foov'
clang-5.0: error: unable to execute command: Aborted (core dumped)
LLVM version:
clang version 5.0.0 (trunk 297835)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/vsevolod/workspace/llvm/bin-trunk/bin
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5.4.0
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/6.0.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.4.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.0.0
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.4.0
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
There are exist several bugs with same assertion, but they all were fixed:
<a href="https://bugs.llvm.org//show_bug.cgi?id=10527">https://bugs.llvm.org//show_bug.cgi?id=10527</a>
<a href="https://bugs.llvm.org//show_bug.cgi?id=10068">https://bugs.llvm.org//show_bug.cgi?id=10068</a>
<a href="https://bugs.llvm.org//show_bug.cgi?id=10689">https://bugs.llvm.org//show_bug.cgi?id=10689</a>
And one more, marked as new:
<a href="https://bugs.llvm.org//show_bug.cgi?id=25330">https://bugs.llvm.org//show_bug.cgi?id=25330</a></pre>
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