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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - llc crashes with "LLVM ERROR: Invalid instruction" when -march=cpp is set"
href="http://llvm.org/bugs/show_bug.cgi?id=17317">17317</a>
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<th>Summary</th>
<td>llc crashes with "LLVM ERROR: Invalid instruction" when -march=cpp is set
</td>
</tr>
<tr>
<th>Product</th>
<td>tools
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>llc
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>ajost@synopsys.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=11258" name="attach_11258" title="Source code.">attachment 11258</a> <a href="attachment.cgi?id=11258&action=edit" title="Source code.">[details]</a></span>
Source code.
Using LLVM 3.3 built from the release repo.
I have a small toy project (250 LOC) with apparently several instances of this
bug. I've introduced a macro at the top to highlight the variations.
If BUGLEVEL is defined as 1, fewer than 50 LOC are active. Clang can compile
the code to LLVM-IR, but llc fails if I specify -march=cpp. llc succeeds
without that option (and the generated assembly appears to be correct). lli
will accept the IR code and run the program correctly.
I found a workaround for the first bug, so at BUGLEVEL 2, some code is disabled
and more is activated. There is apparently another instance of the same bug
somewhere else.
Finally, BUGLEVEL 3 activates the whole 250 LOC, which I hope would work if
this is fixed.
I compile with this command:
clang -O1 -emit-llvm -c test.cpp -o test.bc -Wno-c++11-extensions
-std=c++11 -Wall
Playing with the optimization level appears to change things slightly, but I
can never eliminate the problem completely.</pre>
</div>
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