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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Assertion failed: (Bits != 0 && "Cannot print this instruction.") for patchable functions"
href="https://llvm.org/bugs/show_bug.cgi?id=28524">28524</a>
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<th>Summary</th>
<td>Assertion failed: (Bits != 0 && "Cannot print this instruction.") for patchable functions
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</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>All
</td>
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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>
</tr>
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<th>Component</th>
<td>Common Code Generator Code
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>igor@azulsystems.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=16731" name="attach_16731" title="test case">attachment 16731</a> <a href="attachment.cgi?id=16731&action=edit" title="test case">[details]</a></span>
test case
$ llvm/buildDA/bin/llc -O3 test.ll
Assertion failed: (Bits != 0 && "Cannot print this instruction."), function
printInstruction, file llvm/buildDA/lib/Target/X86/X86GenAsmWriter.inc, line
46606.
Stack dump:
0. Program arguments: llvm/buildDA/bin/llc -O3 tmp.ll
1. Running pass 'Function Pass Manager' on module 'tmp.ll'.
2. Running pass 'X86 Assembly / Object Emitter' on function '@test'
Problem happens when we are trying to print "PATCHABLE_OP 2, KILL, <ops...>"
"X86AsmPrinter::LowerPATCHABLE_OP" can't handle target independent opcodes.
Problematic instruction is generated from PatchableFunction.cpp. It looks for
the first instruction which in this case turns out to be KILL. I suspect that
<a href="http://reviews.llvm.org/rL274952">http://reviews.llvm.org/rL274952</a> is indirectly responsible for such behaviour.</pre>
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