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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - loop-reduce pass crashed after running it twice"
href="https://bugs.llvm.org/show_bug.cgi?id=41484">41484</a>
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</tr>
<tr>
<th>Summary</th>
<td>loop-reduce pass crashed after running it twice
</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>enhancement
</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>cszide@163.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=21771" name="attach_21771" title=".bc file of the source code">attachment 21771</a> <a href="attachment.cgi?id=21771&action=edit" title=".bc file of the source code">[details]</a></span>
.bc file of the source code
$clang -v
clang version 9.0.0 (trunk 355281)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/jack-zhou/Documents/llvm/llvm_truck/llvm/build4/bin
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.3.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.3.0
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
$clang -O3 -c -emit-llvm -mllvm -disable-llvm-optzns small.c
$opt -jump-threading -sroa -loop-reduce -loop-reduce small.bc -o small-opt.bc
Stack dump:
0. Program arguments:
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/build4/bin/opt -jump-threading
-sroa -loop-reduce -loop-reduce small.bc -o small-opt.bc
1. Running pass 'Function Pass Manager' on module 'small.bc'.
2. Running pass 'Loop Pass Manager' on function '@a'
3. Running pass 'Loop Strength Reduction' on basic block '%1'
#0 0x00005604ed5d8d2a llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm/build4/bin/opt+0x20d9d2a)
#1 0x00005604ed5d6d04 llvm::sys::RunSignalHandlers()
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm/build4/bin/opt+0x20d7d04)
#2 0x00005604ed5d6e42 SignalHandler(int)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm/build4/bin/opt+0x20d7e42)
#3 0x00007f32d99ae890 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x12890)
#4 0x00005604eca86e97 llvm::ScalarEvolution::createSCEV(llvm::Value*)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm/build4/bin/opt+0x1587e97)
#5 0x00005604eca88620 llvm::ScalarEvolution::getSCEV(llvm::Value*)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm/build4/bin/opt+0x1589620)
#6 0x00005604ec99a332 llvm::IVUsers::getExpr(llvm::IVStrideUse const&) const
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm/build4/bin/opt+0x149b332)
#7 0x00005604ed437695 (anonymous
namespace)::LSRInstance::CollectInterestingTypesAndFactors()
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm/build4/bin/opt+0x1f38695)
#8 0x00005604ed444488 ReduceLoopStrength(llvm::Loop*, llvm::IVUsers&,
llvm::ScalarEvolution&, llvm::DominatorTree&, llvm::LoopInfo&,
llvm::TargetTransformInfo const&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm/build4/bin/opt+0x1f45488)
#9 0x00005604ec9fdfeb llvm::LPPassManager::runOnFunction(llvm::Function&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm/build4/bin/opt+0x14fefeb)
#10 0x00005604ecf927a9 llvm::FPPassManager::runOnFunction(llvm::Function&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm/build4/bin/opt+0x1a937a9)
#11 0x00005604ecf92831 llvm::FPPassManager::runOnModule(llvm::Module&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm/build4/bin/opt+0x1a93831)
#12 0x00005604ecf91b59 llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm/build4/bin/opt+0x1a92b59)
#13 0x00005604ebb2f153 main
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm/build4/bin/opt+0x630153)
#14 0x00007f32d8643b97 __libc_start_main
/build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:344:0
#15 0x00005604ebbc3f6a _start
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm/build4/bin/opt+0x6c4f6a)
Segmentation fault (core dumped)
By using godbolt, llvm 6/7/trunk version also have this problem.
---------------------------------------------
a() {
int b;
for (; b; b++)
;
}</pre>
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