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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - x86_64: Cannot emit physreg copy instruction"
href="https://llvm.org/bugs/show_bug.cgi?id=25080">25080</a>
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<th>Summary</th>
<td>x86_64: Cannot emit physreg copy instruction
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>All
</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>new bugs
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>dimitry@andric.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>This reproduced with trunk r248374. Minimized test case:
char x0;
*x1;
x2(x3) { return x3 == 0 || x3 == 11 || x3 == 22; }
x4() {
int x5, x6, x7;
for (; x1 && x7 < x0; x7++)
if (x2(x1[x7]))
x5++;
else
x6++;
return x5 && x6;
}
Compile with:
clang -cc1 -triple x86_64-unknown-freebsd11.0 -emit-obj -target-cpu sandybridge
-O2 -vectorize-loops testcase.c
Resulting in:
Cannot emit physreg copy instruction
UNREACHABLE executed at
/share/dim/src/llvm/trunk/lib/Target/X86/X86InstrInfo.cpp:3963!
Abort trap
The target CPU must apparently be sandybridge or higher, the error does not
reproduce with 'plain' x86_64.</pre>
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</p>
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