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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Assertion `Op.getScalarValueSizeInBits() == BitWidth && "Mask size mismatches value type size!"' failed with -O0."
href="https://bugs.llvm.org/show_bug.cgi?id=32345">32345</a>
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<tr>
<th>Summary</th>
<td>Assertion `Op.getScalarValueSizeInBits() == BitWidth && "Mask size mismatches value type size!"' failed with -O0.
</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>
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=18130" name="attach_18130" title="Reproducer.">attachment 18130</a> <a href="attachment.cgi?id=18130&action=edit" title="Reproducer.">[details]</a></span>
Reproducer.
Clang fails with assertion with -O0 option.
Reproducer:
extern const unsigned short var_22;
extern unsigned short var_27;
extern unsigned short var_88;
void foo() {
long a = var_22 ^ var_27 ^ var_27;
char b = long(var_22 ^ var_27 ^ var_27) >> var_27 - 16610;
short c = char(var_88);
}
Error:
<span class="quote">>$ clang++ -w -O0 -c repr.cpp</span >
llvm/llvm-trunk/lib/CodeGen/SelectionDAG/TargetLowering.cpp:505: bool
llvm::TargetLowering::SimplifyDemandedBits(llvm::SDValue, const llvm::APInt&,
llvm::APInt&, llvm::APInt&, llvm::TargetLowering::TargetLoweringOpt&, unsigned
int, bool) const: Assertion `Op.getScalarValueSizeInBits() == BitWidth && "Mask
size mismatches value type size!"' 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'
LLVM version:
clang version 5.0.0 (trunk 298108)
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</pre>
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