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<head>
<base href="https://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - InstCombine crashes when invoked with '-debug' on the attached case"
href="https://llvm.org/bugs/show_bug.cgi?id=24852">24852</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>InstCombine crashes when invoked with '-debug' on the attached case
</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>All
</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>Scalar Optimizations
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>michael.v.zolotukhin@gmail.com
</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=14890" name="attach_14890" title="reproducer">attachment 14890</a> <a href="attachment.cgi?id=14890&action=edit" title="reproducer">[details]</a></span>
reproducer
Stack trace:
$ opt < crash.ll -instcombine -debug
...
INSTCOMBINE ITERATION #1 on main
IC: ADDING: 15 instrs to worklist
IC: Visiting: %S = alloca [54 x i8], align 16
IC: Visiting: %D = alloca [128 x i8], align 16
IC: Visiting: %0 = bitcast [54 x i8]* %S to i8*, !dbg !3
IC: Old = %0 = bitcast [54 x i8]* %S to i8*, !dbg !3
New = <badref> = getelementptr inbounds [54 x i8], [54 x i8]* %S, i32 0,
i32 0
IC: ADD: <badref> = getelementptr inbounds [54 x i8], [54 x i8]* %S, i32 0,
i32 00 opt 0x000000010fd2d42d
llvm::sys::PrintStackTrace(llvm::raw_ostream&) + 61
1 opt 0x000000010fd2c9a6 llvm::sys::RunSignalHandlers() +
70
2 opt 0x000000010fd2de9f SignalHandler(int) + 575
3 libsystem_platform.dylib 0x00007fff93ead52a _sigtramp + 26
4 libsystem_platform.dylib 0x00007fff50f0f828 _sigtramp + 3171296024
5 opt 0x000000010fb6865e (anonymous
namespace)::AssemblyWriter::printMetadataAttachments(llvm::SmallVectorImpl<std::__1::pair<unsigned
int, llvm::MDNode*> > const&, llvm::StringRef) + 78
6 opt 0x000000010fb53ea6 (anonymous
namespace)::AssemblyWriter::printInstruction(llvm::Instruction const&) + 15942
7 opt 0x000000010fb4fcc9
llvm::Value::print(llvm::raw_ostream&, llvm::ModuleSlotTracker&) const + 569
8 opt 0x000000010fb4f8fe
llvm::Value::print(llvm::raw_ostream&) const + 542
9 opt 0x000000010f820146
llvm::InstCombineWorklist::Add(llvm::Instruction*) + 182
10 opt 0x000000010f81d038 llvm::InstCombiner::run() + 2920
11 opt 0x000000010f81e624
combineInstructionsOverFunction(llvm::Function&, llvm::InstCombineWorklist&,
llvm::AAResults*, llvm::AssumptionCache&, llvm::TargetLibraryInfo&,
llvm::DominatorTree&, llvm::LoopInfo*) + 3860
12 opt 0x000000010f81ee4a (anonymous
namespace)::InstructionCombiningPass::runOnFunction(llvm::Function&) + 586
13 opt 0x000000010fc7a3a8
llvm::FPPassManager::runOnFunction(llvm::Function&) + 328
14 opt 0x000000010fc7a5fb
llvm::FPPassManager::runOnModule(llvm::Module&) + 43
15 opt 0x000000010fc7ab46
llvm::legacy::PassManagerImpl::run(llvm::Module&) + 998
16 opt 0x000000010ecfc314 main + 8468
17 libdyld.dylib 0x00007fff870d65ad start + 1
18 libdyld.dylib 0x0000000000000003 start + 2029165143
Segmentation fault: 11
$ clang -v
clang version 3.8.0 (trunk 247715) (llvm/trunk 247716)</pre>
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