[llvm-bugs] [Bug 42737] New: simplifycfg crashes: Assertion `PN->use_empty() && "There shouldn't be any uses here!"' failed.

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=42737

            Bug ID: 42737
           Summary: simplifycfg crashes: Assertion `PN->use_empty() &&
                    "There shouldn't be any uses here!"' failed.
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Transformation Utilities
          Assignee: unassignedbugs at nondot.org
          Reporter: cszide at 163.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 22278
  --> https://bugs.llvm.org/attachment.cgi?id=22278&action=edit
.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;
    }
}

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