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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - MergeICmps crashes when compiling with -fno-builtin"
href="https://bugs.llvm.org/show_bug.cgi?id=37527">37527</a>
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<th>Summary</th>
<td>MergeICmps crashes when compiling with -fno-builtin
</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>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<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>richard-llvm@metafoo.co.uk
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
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<pre>Created <span class=""><a href="attachment.cgi?id=20321" name="attach_20321" title="testcase">attachment 20321</a> <a href="attachment.cgi?id=20321&action=edit" title="testcase">[details]</a></span>
testcase
Testcase attached. Build with:
$ clang -cc1 -O3 -fno-builtin -x ir merge-icmp.ir -emit-obj -o /dev/null
to reproduce the crash:
Stack dump:
0. Program arguments: clang -cc1 -O3 -fno-builtin -x ir /tmp/merge-icmp.ir
-emit-obj -o /dev/null
1. Code generation
2. Running pass 'Function Pass Manager' on module '/tmp/merge-icmp.ir'.
3. Running pass 'Merge contiguous icmps into a memcmp' on function
'@wobble'
#0 0x0000556256dd66a6 llvm::sys::RunSignalHandlers() (clang+0x1d4f6a6)
#1 0x00005562560552f4 SignalHandler(int) (clang+0xfce2f4)
#2 0x00007f29694cf9a0 __restore_rt (/usr/grte/v4/lib64/libpthread.so.0+0xf9a0)
#3 0x0000556256f01180 llvm::IRBuilder<llvm::ConstantFolder,
llvm::IRBuilderDefaultInserter>::CreateICmp(llvm::CmpInst::Predicate,
llvm::Value*, llvm::Value*, llvm::Twine const&) (clang+0x1e7a180)
#4 0x000055625628fd05 (anonymous
namespace)::BCECmpChain::mergeComparisons(llvm::ArrayRef<(anonymous
namespace)::BCECmpBlock>, llvm::BasicBlock*, llvm::PHINode&,
llvm::TargetLibraryInfo const*) (clang+0x1208d05)
#5 0x0000556256269972 (anonymous
namespace)::MergeICmps::runOnFunction(llvm::Function&) (clang+0x11e2972)</pre>
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