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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - lib/Target/AArch64/AArch64InstrInfo.cpp:3556: suspicious shift ?"
href="https://llvm.org/bugs/show_bug.cgi?id=28624">28624</a>
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<th>Summary</th>
<td>lib/Target/AArch64/AArch64InstrInfo.cpp:3556: suspicious shift ?
</td>
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<th>Product</th>
<td>new-bugs
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>new bugs
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>dcb314@hotmail.com
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<th>Classification</th>
<td>Unclassified
</td>
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<p>
<div>
<pre>trunk/llvm/lib/Target/AArch64/AArch64InstrInfo.cpp:3556]: (error) Shifting
32-bit value by 32 bits is undefined behaviour
Source code is
uint64_t UImm = -Imm << (64 - BitSize) >> (64 - BitSize);
Maybe better code
uint64_t UImm = ((uint64_t) -Imm) << (64 - BitSize) >> (64 - BitSize);</pre>
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