[llvm-bugs] [Bug 32934] New: opt crashes with "opt -inline -newgvn": Assertion `CC->getMemoryLeader() && "Every MemoryAccess should be mapped to a " "congruence class with a represenative memory " "access"' failed

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=32934

            Bug ID: 32934
           Summary: opt crashes with "opt -inline -newgvn": Assertion
                    `CC->getMemoryLeader() && "Every MemoryAccess should
                    be mapped to a " "congruence class with a
                    represenative memory " "access"' 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

$ clang -v
clang version 5.0.0 (trunk 302200)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/clang-trunk/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
$
$ clang -O3 -mllvm -disable-llvm-optzns -S -emit-llvm -o small.bc small.c
$ opt -inline -newgvn -o small-opt.bc small.bc
opt: /tmp/llvm-builder/llvm-source-trunk/lib/Transforms/Scalar/NewGVN.cpp:1022:
const llvm::MemoryAccess* {anonymous}::NewGVN::lookupMemoryLeader(const
llvm::MemoryAccess*) const: Assertion `CC->getMemoryLeader() && "Every
MemoryAccess should be mapped to a " "congruence class with a represenative
memory " "access"' failed.
#0 0x0000000001ec265a (opt+0x1ec265a)
#1 0x0000000001ec077e (opt+0x1ec077e)
#2 0x0000000001ec08e0 (opt+0x1ec08e0)
#3 0x00007ffc0c566330 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x10330)
#4 0x00007ffc0b34fc37 gsignal
/build/eglibc-MjiXCM/eglibc-2.19/signal/../nptl/sysdeps/unix/sysv/linux/raise.c:56:0
#5 0x00007ffc0b353028 abort
/build/eglibc-MjiXCM/eglibc-2.19/stdlib/abort.c:91:0
#6 0x00007ffc0b348bf6 __assert_fail_base
/build/eglibc-MjiXCM/eglibc-2.19/assert/assert.c:92:0
#7 0x00007ffc0b348ca2 (/lib/x86_64-linux-gnu/libc.so.6+0x2fca2)
#8 0x0000000000830ea2 (opt+0x830ea2)
#9 0x0000000001d8e27e (opt+0x1d8e27e)
#10 0x0000000001da333b (opt+0x1da333b)
#11 0x0000000001da4a4d (opt+0x1da4a4d)
#12 0x0000000001da60d7 (opt+0x1da60d7)
#13 0x0000000001a0aaa3 (opt+0x1a0aaa3)
#14 0x00000000014a61c6 (opt+0x14a61c6)
#15 0x0000000001a0b38a (opt+0x1a0b38a)
#16 0x000000000088bbef (opt+0x88bbef)
#17 0x00007ffc0b33af45 __libc_start_main
/build/eglibc-MjiXCM/eglibc-2.19/csu/libc-start.c:321:0
#18 0x00000000008e754a (opt+0x8e754a)
Stack dump:
0.      Program arguments: opt -inline -newgvn -o small-opt.bc small.bc
1.      Running pass 'CallGraph Pass Manager' on module 'small.bc'.
2.      Running pass 'Global Value Numbering' on function '@fn1'
Aborted (core dumped)
$


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


int a, b;

void fn1 ()
{ 
  int c = 0;
  for (; c < 1; c++)
    { 
      int d = a;
    L:
      if (d)
        { 
          __builtin_printf ("0");
          goto L;
        }
    }
  while (b)
    __builtin_printf ("0");
  int f = a;
}

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

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