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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - SROA Assertion `isAllocaPromotable(AI) && "Cannot promote non-promotable alloca!"' failed. 3.7+"
href="https://llvm.org/bugs/show_bug.cgi?id=27999">27999</a>
</td>
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<tr>
<th>Summary</th>
<td>SROA Assertion `isAllocaPromotable(AI) && "Cannot promote non-promotable alloca!"' failed. 3.7+
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<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>Scalar Optimizations
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>adrake@adrake.org
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</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=16469" name="attach_16469" title="Source code for test case">attachment 16469</a> <a href="attachment.cgi?id=16469&action=edit" title="Source code for test case">[details]</a></span>
Source code for test case
I encountered this crash first in rustc, I was able to reduce the output to a
seven instruction testcase isolating the bug to the SROA pass. This test
command:
opt -sroa to_submit.ll
Crashes with:
/home/adrake/osrc/llvm/lib/Transforms/Utils/PromoteMemoryToRegister.cpp:531:
void {anonymous}::PromoteMem2Reg::run(): Assertion `isAllocaPromotable(AI) &&
"Cannot promote non-promotable alloca!"' failed
Both on LLVM trunk@271371 and on rustc's fork of 3.8. That same test case
crashes Fedora's 3.7 build with:
Instruction does not dominate all uses!
<badref> = bitcast #0 0x7f221dec8327
llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/usr/lib64/llvm/libLLVM-3.7.so+0x510327)
That is not a debug build, so it is possible it would hit a similar assertion
before producing non-validating bitcode output.
I've attached bitcode files produced by my trunk build (to_submit39.bc) as well
as Fedora's 3.7 build (to_submit37.bc) for reference. I've also attached the
debug log from the trunk run (to_submit39.log). I am running on and targeting
x86_64
Please let me know if you need any more information! I am happy to run any
additional tests or provide additional data if needed.</pre>
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