[llvm-bugs] [Bug 49573] New: ipsccp pass crashes: Assertion `pred_empty(DelBB) && "DelBB has one or more predecessors."' failed.

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=49573

            Bug ID: 49573
           Summary: ipsccp pass crashes: Assertion `pred_empty(DelBB) &&
                    "DelBB has one or more predecessors."' failed.
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Interprocedural Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: cszide at 163.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 24638
  --> https://bugs.llvm.org/attachment.cgi?id=24638&action=edit
small.bc

$clang -v
clang version 13.0.0 (https://github.com/llvm/llvm-project.git
77394c12a48822bb7a9183408f922d90c1d563cd)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/jack-zhou/Documents/llvm/llvm_truck/llvm-project/build/bin
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/10
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8.5
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/7.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/10
Candidate multilib: .;@m64
Selected multilib: .;@m64

$clang -O3 -c -emit-llvm -femit-all-decls -mllvm -disable-llvm-optzns small.c
-o small.bc

$opt -instcombine -inline -rpo-function-attrs -gvn -sccp -loop-extract
-structurizecfg -loop-extract-single -ipsccp small.bc -o small-opt.bc
opt:
/home/jack-zhou/Documents/llvm/llvm_truck/llvm-project/llvm/lib/Analysis/DomTreeUpdater.cpp:216:
void llvm::DomTreeUpdater::validateDeleteBB(llvm::BasicBlock*): Assertion
`pred_empty(DelBB) && "DelBB has one or more predecessors."' failed.
PLEASE submit a bug report to https://bugs.llvm.org/ and include the crash
backtrace.
Stack dump:
0.      Program arguments:
/home/jack-zhou/Documents/llvm/llvm_truck/llvm-project/build/bin/opt
-instcombine -inline -rpo-function-attrs -gvn -sccp -loop-extract
-structurizecfg -loop-extract-single -ipsccp small.bc -o small-opt.bc
1.      Running pass 'Interprocedural Sparse Conditional Constant Propagation'
on module 'small.bc'.
 #0 0x000055da685435ec llvm::sys::PrintStackTrace(llvm::raw_ostream&, int)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm-project/build/bin/opt+0x2e865ec)
 #1 0x000055da685412b4 llvm::sys::RunSignalHandlers()
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm-project/build/bin/opt+0x2e842b4)
 #2 0x000055da68541423 SignalHandler(int) Signals.cpp:0:0
 #3 0x00007fe618c508a0 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x128a0)
 #4 0x00007fe6178b7f47 raise
/build/glibc-2ORdQG/glibc-2.27/signal/../sysdeps/unix/sysv/linux/raise.c:51:0
 #5 0x00007fe6178b98b1 abort /build/glibc-2ORdQG/glibc-2.27/stdlib/abort.c:81:0
 #6 0x00007fe6178a942a __assert_fail_base
/build/glibc-2ORdQG/glibc-2.27/assert/assert.c:89:0
 #7 0x00007fe6178a94a2 (/lib/x86_64-linux-gnu/libc.so.6+0x304a2)
 #8 0x000055da67471908
llvm::DomTreeUpdater::validateDeleteBB(llvm::BasicBlock*)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm-project/build/bin/opt+0x1db4908)
 #9 0x000055da67471a91 llvm::DomTreeUpdater::deleteBB(llvm::BasicBlock*)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm-project/build/bin/opt+0x1db4a91)
#10 0x000055da683c1eb0 llvm::runIPSCCP(llvm::Module&, llvm::DataLayout const&,
std::function<llvm::TargetLibraryInfo const& (llvm::Function&)>,
llvm::function_ref<llvm::AnalysisResultsForFn (llvm::Function&)>)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm-project/build/bin/opt+0x2d04eb0)
#11 0x000055da67f09f39 (anonymous
namespace)::IPSCCPLegacyPass::runOnModule(llvm::Module&) SCCP.cpp:0:0
#12 0x000055da67cf2196 llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm-project/build/bin/opt+0x2635196)
#13 0x000055da66033c0d main
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm-project/build/bin/opt+0x976c0d)
#14 0x00007fe61789ab97 __libc_start_main
/build/glibc-2ORdQG/glibc-2.27/csu/../csu/libc-start.c:344:0
#15 0x000055da660fceaa _start
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm-project/build/bin/opt+0xa3feaa)
Aborted (core dumped)

The source code of small.c is as follows.
--------------------------------------------------------
int a, b;
short c;
long d;
short(e)() {}
short *f();
void g();
void h();
void l() {
  g();
  f();
}
short *f() {
  for (;;) {
    int i = e();
    if (i)
      ;
    else {
      for (; a <= 0;) {
        int j;
        {
          int k;
          if (d)
            break;
        }
      }
      return &c;
    }
  }
}
void g() {
  int m = 0;
  int n[1];
  int o = n[0];
  for (;;)
    if (m)
      break;
  b = o;
  h(&m);
}

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