[llvm-bugs] [Bug 48082] New: LLVM ERROR: Broken function found, compilation aborted! with "-simplifycfg -sroa -jump-threading -lcssa -loop-unroll"

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=48082

            Bug ID: 48082
           Summary: LLVM ERROR: Broken function found, compilation
                    aborted! with "-simplifycfg -sroa -jump-threading
                    -lcssa -loop-unroll"
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: suochenyao at 163.com
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org

*******************************************************************************
OS and Platform:
CentOS Linux release 7.8.2003 (Core), x86_64 GNU/Linux
*******************************************************************************
Program:
union a {
  short b;
  short c;
};

int d=1, e=1;
long f=1L, g=1L;

long (h)() {
  return 0;
}

int i() {
  union a j;
  j.c=1;
  for (;; j.c = h()) {
    long k[4][3][4] = {g};
    k[3][0][1] = g;
    d = 0;
    for (; d >= 0;)
      return 0;
    for (;;) {
      if (j.c)
        ;
      else {
        int l=2;
        int *m = &l;
        int **n = &m;
        for (; f;) {
          for (; e;)
            k[3][0][1];
          &n == &n;
          return 0;
        }
      }
      if (j.b)
        break;
    }
  }
  return 0;
}

int main() {
  return 0;
}
*******************************************************************************
clang version:
$ clang -v
clang version 12.0.0 (/home/suocy/src/llvm-dev/llvm-project/llvm/tools/clang
4455f3ce72ba2bb0276200f6f29629afca8812d4)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/suocy/bin/llvm-dev/bin
Found candidate GCC installation:
/opt/rh/devtoolset-7/root/usr/lib/gcc/x86_64-redhat-linux/7
Found candidate GCC installation: /usr/lib/gcc/x86_64-redhat-linux/4.8.2
Found candidate GCC installation: /usr/lib/gcc/x86_64-redhat-linux/4.8.5
Selected GCC installation:
/opt/rh/devtoolset-7/root/usr/lib/gcc/x86_64-redhat-linux/7
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Selected multilib: .;@m64
*******************************************************************************
Command Lines:
$ clang -c -emit-llvm -O3 -mllvm -disable-llvm-optzns a.c -o a.bc
a.c:31:22: warning: expression result unused [-Wunused-value]
            k[3][0][1];
            ~~~~~~~ ~^
a.c:32:14: warning: equality comparison result unused [-Wunused-comparison]
          &n == &n;
          ~~~^~~~~
2 warnings generated.
$ opt -simplifycfg -sroa -jump-threading -lcssa -loop-unroll a.bc -o a.opt.bc
PHI nodes must have at least one entry.  If the block is dead, the PHI should
be removed!
  %retval.3 = phi i32
in function i
LLVM ERROR: Broken function found, compilation aborted!
PLEASE submit a bug report to https://bugs.llvm.org/ and include the crash
backtrace.
Stack dump:
0.      Program arguments: /home/suocy/bin/llvm-dev/bin/opt -simplifycfg -sroa
-jump-threading -lcssa -loop-unroll a.bc -o a.opt.bc
1.      Running pass 'Function Pass Manager' on module 'a.bc'.
2.      Running pass 'Module Verifier' on function '@i'
 #0 0x0000000002a110fc llvm::sys::PrintStackTrace(llvm::raw_ostream&, int)
(/home/suocy/bin/llvm-dev/bin/opt+0x2a110fc)
 #1 0x0000000002a0f0a4 llvm::sys::RunSignalHandlers()
(/home/suocy/bin/llvm-dev/bin/opt+0x2a0f0a4)
 #2 0x0000000002a0f203 SignalHandler(int)
(/home/suocy/bin/llvm-dev/bin/opt+0x2a0f203)
 #3 0x00007f0ed8fb3630 __restore_rt (/lib64/libpthread.so.0+0xf630)
 #4 0x00007f0ed7ba1387 raise (/lib64/libc.so.6+0x36387)
 #5 0x00007f0ed7ba2a78 abort (/lib64/libc.so.6+0x37a78)
 #6 0x0000000002984b24 llvm::report_fatal_error(llvm::Twine const&, bool)
(/home/suocy/bin/llvm-dev/bin/opt+0x2984b24)
 #7 0x0000000002984c58 (/home/suocy/bin/llvm-dev/bin/opt+0x2984c58)
 #8 0x00000000022de51f (anonymous
namespace)::VerifierLegacyPass::runOnFunction(llvm::Function&)
(/home/suocy/bin/llvm-dev/bin/opt+0x22de51f)
 #9 0x0000000002263bd8 llvm::FPPassManager::runOnFunction(llvm::Function&)
(/home/suocy/bin/llvm-dev/bin/opt+0x2263bd8)
#10 0x0000000002264679 llvm::FPPassManager::runOnModule(llvm::Module&)
(/home/suocy/bin/llvm-dev/bin/opt+0x2264679)
#11 0x0000000002263483 llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/home/suocy/bin/llvm-dev/bin/opt+0x2263483)
#12 0x00000000007235ab main (/home/suocy/bin/llvm-dev/bin/opt+0x7235ab)
#13 0x00007f0ed7b8d555 __libc_start_main (/lib64/libc.so.6+0x22555)
#14 0x00000000007d7185 _start (/home/suocy/bin/llvm-dev/bin/opt+0x7d7185)
Aborted

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