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<base href="https://bugs.llvm.org/">
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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 - loop-versioning crashes: Assertion `L->getLoopPreheader() && "Can't expand add recurrences without a loop preheader!"' failed."
href="https://bugs.llvm.org/show_bug.cgi?id=43645">43645</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>loop-versioning crashes: Assertion `L->getLoopPreheader() && "Can't expand add recurrences without a loop preheader!"' failed.
</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=22653" name="attach_22653" title="CHOLESKY1.bc">attachment 22653</a> <a href="attachment.cgi?id=22653&action=edit" title="CHOLESKY1.bc">[details]</a></span>
CHOLESKY1.bc
$clang -v
clang version 10.0.0 (trunk 373844)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/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/7.4.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.4.0
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
$opt -loop-rotate -mem2reg -loop-unswitch -loop-unswitch -simplifycfg
-loop-versioning CHOLESKY1.bc
WARNING: You're attempting to print out a bitcode file.
This is inadvisable as it may cause display problems. If
you REALLY want to taste LLVM bitcode first-hand, you
can force output with the `-f' option.
opt:
/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/lib/Analysis/ScalarEvolutionExpander.cpp:1267:
llvm::PHINode* llvm::SCEVExpander::getAddRecExprPHILiterally(const
llvm::SCEVAddRecExpr*, const llvm::Loop*, llvm::Type*, llvm::Type*,
llvm::Type*&, bool&): Assertion `L->getLoopPreheader() && "Can't expand add
recurrences without a loop preheader!"' failed.
Stack dump:
0. Program arguments:
/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt -loop-rotate
-mem2reg -loop-unswitch -loop-unswitch -simplifycfg -loop-versioning
CHOLESKY1.bc
1. Running pass 'Function Pass Manager' on module 'CHOLESKY1.bc'.
2. Running pass 'Loop Versioning' on function '@ScatterUpdateFO2'
#0 0x00005617069b7baa llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x2791baa)
#1 0x00005617069b5884 llvm::sys::RunSignalHandlers()
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x278f884)
#2 0x00005617069b59c2 SignalHandler(int)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x278f9c2)
#3 0x00007fe158508890 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x12890)
#4 0x00007fe1571bae97 raise
/build/glibc-OTsEL5/glibc-2.27/signal/../sysdeps/unix/sysv/linux/raise.c:51:0
#5 0x00007fe1571bc801 abort /build/glibc-OTsEL5/glibc-2.27/stdlib/abort.c:81:0
#6 0x00007fe1571ac39a __assert_fail_base
/build/glibc-OTsEL5/glibc-2.27/assert/assert.c:89:0
#7 0x00007fe1571ac412 (/lib/x86_64-linux-gnu/libc.so.6+0x30412)
#8 0x0000561705d65fe2
llvm::SCEVExpander::getAddRecExprPHILiterally(llvm::SCEVAddRecExpr const*,
llvm::Loop const*, llvm::Type*, llvm::Type*, llvm::Type*&, bool&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x1b3ffe2)
#9 0x0000561705d661b4
llvm::SCEVExpander::expandAddRecExprLiterally(llvm::SCEVAddRecExpr const*)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x1b401b4)
#10 0x0000561705d62a60 llvm::SCEVExpander::expand(llvm::SCEV const*)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x1b3ca60)
#11 0x0000561705d62f9c llvm::SCEVExpander::expandCodeFor(llvm::SCEV const*,
llvm::Type*)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x1b3cf9c)
#12 0x0000561705c5b6cb
expandBounds(llvm::RuntimePointerChecking::CheckingPtrGroup const*,
llvm::Loop*, llvm::Instruction*, llvm::SCEVExpander&, llvm::ScalarEvolution*,
llvm::RuntimePointerChecking const&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x1a356cb)
#13 0x0000561705c5bbf8
llvm::LoopAccessInfo::addRuntimeChecks(llvm::Instruction*,
llvm::SmallVectorImpl<std::pair<llvm::RuntimePointerChecking::CheckingPtrGroup
const*, llvm::RuntimePointerChecking::CheckingPtrGroup const*> > const&) const
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x1a35bf8)
#14 0x0000561706a7ad82
llvm::LoopVersioning::versionLoop(llvm::SmallVectorImpl<llvm::Instruction*>
const&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x2854d82)
#15 0x0000561706a7c6f0 (anonymous
namespace)::LoopVersioningPass::runOnFunction(llvm::Function&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x28566f0)
#16 0x00005617062f1a49 llvm::FPPassManager::runOnFunction(llvm::Function&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x20cba49)
#17 0x00005617062f1b19 llvm::FPPassManager::runOnModule(llvm::Module&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x20cbb19)
#18 0x00005617062f0ca1 llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x20caca1)
#19 0x0000561704abc01f main
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x89601f)
#20 0x00007fe15719db97 __libc_start_main
/build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:344:0
#21 0x0000561704b3421a _start
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x90e21a)
Aborted (core dumped)</pre>
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