[llvm-bugs] [Bug 42421] New: loop-versioning-licm crashes: Assertion `L->isRecursivelyLCSSAForm(*DT, *LI) && "Requested to preserve LCSSA, but it's already broken."' failed.

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=42421

            Bug ID: 42421
           Summary: loop-versioning-licm crashes: Assertion
                    `L->isRecursivelyLCSSAForm(*DT, *LI) && "Requested to
                    preserve LCSSA, but it's already broken."' failed.
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Scalar Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: cszide at 163.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 22151
  --> https://bugs.llvm.org/attachment.cgi?id=22151&action=edit
.bc file of the source code

$clang -v
clang version 9.0.0 (trunk 363125)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build1/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 -loop-rotate -jump-threading -gvn -loop-versioning-licm small.bc -o
small-opt.bc
opt:
/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/lib/Transforms/Utils/LoopSimplify.cpp:720:
bool llvm::simplifyLoop(llvm::Loop*, llvm::DominatorTree*, llvm::LoopInfo*,
llvm::ScalarEvolution*, llvm::AssumptionCache*, llvm::MemorySSAUpdater*, bool):
Assertion `L->isRecursivelyLCSSAForm(*DT, *LI) && "Requested to preserve LCSSA,
but it's already broken."' failed.
Stack dump:
0.      Program arguments:
/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build1/bin/opt -loop-rotate
-jump-threading -gvn -loop-versioning-licm small.bc -o small-opt.bc 
1.      Running pass 'Function Pass Manager' on module 'small.bc'.
2.      Running pass 'Canonicalize natural loops' on function '@h'
 #0 0x000055a904ded87a llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build1/bin/opt+0x257887a)
 #1 0x000055a904deb534 llvm::sys::RunSignalHandlers()
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build1/bin/opt+0x2576534)
 #2 0x000055a904deb672 SignalHandler(int)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build1/bin/opt+0x2576672)
 #3 0x00007fd9b4b64890 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x12890)
 #4 0x00007fd9b3816e97 raise
/build/glibc-OTsEL5/glibc-2.27/signal/../sysdeps/unix/sysv/linux/raise.c:51:0
 #5 0x00007fd9b3818801 abort /build/glibc-OTsEL5/glibc-2.27/stdlib/abort.c:81:0
 #6 0x00007fd9b380839a __assert_fail_base
/build/glibc-OTsEL5/glibc-2.27/assert/assert.c:89:0
 #7 0x00007fd9b3808412 (/lib/x86_64-linux-gnu/libc.so.6+0x30412)
 #8 0x000055a904e8efc5 llvm::simplifyLoop(llvm::Loop*, llvm::DominatorTree*,
llvm::LoopInfo*, llvm::ScalarEvolution*, llvm::AssumptionCache*,
llvm::MemorySSAUpdater*, bool)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build1/bin/opt+0x2619fc5)
 #9 0x000055a904e8f26d (anonymous
namespace)::LoopSimplify::runOnFunction(llvm::Function&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build1/bin/opt+0x261a26d)
#10 0x000055a9047a6189 llvm::FPPassManager::runOnFunction(llvm::Function&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build1/bin/opt+0x1f31189)
#11 0x000055a9047a6281 llvm::FPPassManager::runOnModule(llvm::Module&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build1/bin/opt+0x1f31281)
#12 0x000055a9047a53e1 llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build1/bin/opt+0x1f303e1)
#13 0x000055a90308e0a9 main
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build1/bin/opt+0x8190a9)
#14 0x00007fd9b37f9b97 __libc_start_main
/build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:344:0
#15 0x000055a9031133fa _start
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build1/bin/opt+0x89e3fa)
Aborted (core dumped)

--------------------------------------------
int a, b, e, f;
long c, d;
void(g)();
int *h() {
  long **j, **k, **l, **m;
  int *n = 0;
o:
  if (d ^ d) {
    int p;
    if (c) {
      int i = 0;
      for (; i; i++)
        ;
      e = 0;
      for (; e >= 0;) {
        b = 0;
        for (; b; g())
          if (a)
            ;
      }
    } else {
      long **q;
      for (; f >= 0;) {
        if (f)
          goto o;
        long ***r[][1][10] = {{&m}, &j, 0, &k, &m, &q, 0, &q, &k, &l};
      }
    }
  }
  return n;
}

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