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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 - simplifycfg crashes: Assertion `PN->use_empty() && "There shouldn't be any uses here!"' failed."
href="https://bugs.llvm.org/show_bug.cgi?id=42737">42737</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>simplifycfg crashes: Assertion `PN->use_empty() && "There shouldn't be any uses here!"' 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>Transformation Utilities
</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=22278" name="attach_22278" title=".bc file of the source code">attachment 22278</a> <a href="attachment.cgi?id=22278&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 366393)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build3/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
$clang -O3 -c -emit-llvm -femit-all-decls -mllvm -disable-llvm-optzns small.c
$opt -reg2mem -licm -sroa -indvars -simplifycfg small.bc -o small-opt.bc
opt:
/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/lib/Transforms/Utils/Local.cpp:1055:
bool llvm::TryToSimplifyUncondBranchFromEmptyBlock(llvm::BasicBlock*,
llvm::DomTreeUpdater*): Assertion `PN->use_empty() && "There shouldn't be any
uses here!"' failed.
Stack dump:
0. Program arguments:
/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build3/bin/opt -reg2mem -licm
-sroa -indvars -simplifycfg small.bc -o small-opt.bc
1. Running pass 'Function Pass Manager' on module 'small.bc'.
2. Running pass 'Simplify the CFG' on function '@d'
#0 0x0000561e76298b5a llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build3/bin/opt+0x263eb5a)
#1 0x0000561e76296804 llvm::sys::RunSignalHandlers()
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build3/bin/opt+0x263c804)
#2 0x0000561e76296942 SignalHandler(int)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build3/bin/opt+0x263c942)
#3 0x00007f20aeab5890 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x12890)
#4 0x00007f20ad767e97 raise
/build/glibc-OTsEL5/glibc-2.27/signal/../sysdeps/unix/sysv/linux/raise.c:51:0
#5 0x00007f20ad769801 abort /build/glibc-OTsEL5/glibc-2.27/stdlib/abort.c:81:0
#6 0x00007f20ad75939a __assert_fail_base
/build/glibc-OTsEL5/glibc-2.27/assert/assert.c:89:0
#7 0x00007f20ad759412 (/lib/x86_64-linux-gnu/libc.so.6+0x30412)
#8 0x0000561e7632de80
llvm::TryToSimplifyUncondBranchFromEmptyBlock(llvm::BasicBlock*,
llvm::DomTreeUpdater*)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build3/bin/opt+0x26d3e80)
#9 0x0000561e763ac98a llvm::simplifyCFG(llvm::BasicBlock*,
llvm::TargetTransformInfo const&, llvm::SimplifyCFGOptions const&,
llvm::SmallPtrSetImpl<llvm::BasicBlock*>*)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build3/bin/opt+0x275298a)
#10 0x0000561e761a61f7 iterativelySimplifyCFG(llvm::Function&,
llvm::TargetTransformInfo const&, llvm::SimplifyCFGOptions const&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build3/bin/opt+0x254c1f7)
#11 0x0000561e761a6f63 (anonymous
namespace)::CFGSimplifyPass::runOnFunction(llvm::Function&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build3/bin/opt+0x254cf63)
#12 0x0000561e75c3c069 llvm::FPPassManager::runOnFunction(llvm::Function&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build3/bin/opt+0x1fe2069)
#13 0x0000561e75c3c161 llvm::FPPassManager::runOnModule(llvm::Module&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build3/bin/opt+0x1fe2161)
#14 0x0000561e75c3b2c1 llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build3/bin/opt+0x1fe12c1)
#15 0x0000561e744a1d85 main
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build3/bin/opt+0x847d85)
#16 0x00007f20ad74ab97 __libc_start_main
/build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:344:0
#17 0x0000561e7452836a _start
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build3/bin/opt+0x8ce36a)
Aborted (core dumped)
-----------------------------------------------------
int a, b, c;
void d() {
if (b)
for (;;) {
short e;
if (c)
continue;
a = 2;
}
}</pre>
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