[llvm-bugs] [Bug 36244] New: opt crashes with "opt -inline -sroa -lcssa -loop-rotate -instcombine -jump-threading": Assertion `PN->use_empty() && "Trying to remove a phi with uses."' failed

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=36244

            Bug ID: 36244
           Summary: opt crashes with "opt -inline -sroa -lcssa
                    -loop-rotate -instcombine -jump-threading": Assertion
                    `PN->use_empty() && "Trying to remove a phi with
                    uses."' failed
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Scalar Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: su at cs.ucdavis.edu
                CC: llvm-bugs at lists.llvm.org

Tested with trunk revision 324265. 


$ clangpolly -v
clang version 7.0.0 (http://llvm.org/git/clang.git
9658e036b90bc92b86c96a213d89fe87475701db) (llvm/trunk 324265)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/su/bin
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9.4
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5.3.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7.3
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/4.9
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.3.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.2.0
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
$ 
$ clangpolly -O3 -mllvm -disable-llvm-optzns -c -emit-llvm -o small.bc small.c
$ optpolly -inline -sroa -lcssa -loop-rotate -instcombine -jump-threading -o
small-opt.bc small.bc
optpolly: /home/su/software/tmp/polly/llvm/lib/Transforms/Utils/LCSSA.cpp:226:
bool llvm::formLCSSAForInstructions(llvm::SmallVectorImpl<llvm::Instruction*>&,
llvm::DominatorTree&, llvm::LoopInfo&): Assertion `PN->use_empty() && "Trying
to remove a phi with uses."' failed.
LLVMSymbolizer: error reading file: No such file or directory
#0 0x00000000020a618a (optpolly+0x20a618a)
#1 0x00000000020a433e (optpolly+0x20a433e)
#2 0x00000000020a44a0 (optpolly+0x20a44a0)
#3 0x00007f7100043330 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x10330)
#4 0x00007f70fee2bc37 gsignal
/build/eglibc-SvCtMH/eglibc-2.19/signal/../nptl/sysdeps/unix/sysv/linux/raise.c:56:0
#5 0x00007f70fee2f028 abort
/build/eglibc-SvCtMH/eglibc-2.19/stdlib/abort.c:91:0
#6 0x00007f70fee24bf6 __assert_fail_base
/build/eglibc-SvCtMH/eglibc-2.19/assert/assert.c:92:0
#7 0x00007f70fee24ca2 (/lib/x86_64-linux-gnu/libc.so.6+0x2fca2)
#8 0x0000000002108f85 (optpolly+0x2108f85)
#9 0x0000000002109625 (optpolly+0x2109625)
#10 0x00000000021099df (optpolly+0x21099df)
#11 0x00000000021099c5 (optpolly+0x21099c5)
#12 0x00000000021099c5 (optpolly+0x21099c5)
#13 0x00000000021099c5 (optpolly+0x21099c5)
#14 0x00000000021099c5 (optpolly+0x21099c5)
#15 0x000000000210a055 (optpolly+0x210a055)
#16 0x0000000001b975eb (optpolly+0x1b975eb)
#17 0x00000000015ff5e6 (optpolly+0x15ff5e6)
#18 0x0000000001b982fa (optpolly+0x1b982fa)
#19 0x00000000008c5785 (optpolly+0x8c5785)
#20 0x00007f70fee16f45 __libc_start_main
/build/eglibc-SvCtMH/eglibc-2.19/csu/libc-start.c:321:0
#21 0x0000000000939486 (optpolly+0x939486)
Stack dump:
0.      Program arguments: optpolly -inline -sroa -lcssa -loop-rotate
-instcombine -jump-threading -o small-opt.bc small.bc 
1.      Running pass 'CallGraph Pass Manager' on module 'small.bc'.
2.      Running pass 'Loop-Closed SSA Form Pass' on function '@main'
Aborted (core dumped)
$ 


--------------------------------


int a, b, c, d, e, f, g, i, j;
volatile int h;

void fn1 ()
{
  int l = 0, m;
  for (j = 0; j < 1;)
    {
      int n = 1;
      if (n)
        {
        L:
          while (f)
            m++;
          if (a)
            goto L;
          l++;
          if (l)
            break;
          if (d)
            goto L;
        }
      if (b || e)
        if (!c)
          goto L;
      if ((i || i) && g)
        {
          int p;
          if (i)
            continue;
          goto L;
        }
      h;
    }
}

int main ()
{
  fn1 (); 
  return 0; 
}

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