<html>
<head>
<base href="https://llvm.org/bugs/" />
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - MI Serialization crashes on empty inlineasm"
href="https://llvm.org/bugs/show_bug.cgi?id=24631">24631</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>MI Serialization crashes on empty inlineasm
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</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>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Common Code Generator Code
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>hfinkel@anl.gov
</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>Created <span class=""><a href="attachment.cgi?id=14795" name="attach_14795" title="reduced test case">attachment 14795</a> <a href="attachment.cgi?id=14795&action=edit" title="reduced test case">[details]</a></span>
reduced test case
$ cat mirp.ll
target datalayout = "E-m:e-i64:64-n32:64"
target triple = "powerpc64-unknown-linux-gnu"
define void @foo() #0 {
entry:
tail call void asm sideeffect "", "~{memory}"() #0
ret void
}
attributes #0 = { nounwind }
$ llc -stop-after=if-converter < mirp.ll
llc: /src/llvm/lib/IR/AsmWriter.cpp:346: void
llvm::printLLVMNameWithoutPrefix(llvm::raw_ostream&, llvm::StringRef):
Assertion `!Name.empty() && "Cannot get empty name!"' failed.
The problem seems related to how llvm::MIPrinter::print handles external
symbols, specifically:
789 case MachineOperand::MO_ExternalSymbol:
790 OS << '$';
791 printLLVMNameWithoutPrefix(OS, Op.getSymbolName());
792 printOffset(Op.getOffset());
793 break;
printLLVMNameWithoutPrefix cannot be called with an empty name string, but it
is in this case because the inline asm string is empty:
INLINEASM <es:> [sideeffect] [mayload] [maystore] [attdialect]</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>