[llvm-bugs] [Bug 33412] New: opt crashes with "opt -mem2reg -early-cse-memssa": Assertion `isa<X>(Val) && "cast<Ty>() argument of incompatible type!"' failed

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=33412

            Bug ID: 33412
           Summary: opt crashes with "opt -mem2reg -early-cse-memssa":
                    Assertion `isa<X>(Val) && "cast<Ty>() argument of
                    incompatible type!"' 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 305165) (llvm/trunk 305163)
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/5
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5.4.0
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/6.0.0
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/4.7.4
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/4.9.3
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.4.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.0.0
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.4.0
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
$ 
$ clang -O3 -mllvm -disable-llvm-optzns -c -emit-llvm -o small.bc small.c
$ opt -mem2reg -early-cse-memssa -o small-opt.bc small.bc
opt: /tmp/llvm-builder/llvm-source-trunk/include/llvm/Support/Casting.h:248:
typename llvm::cast_retty<To, From>::ret_type llvm::cast(Y&) [with X =
llvm::MemoryAccess; Y = llvm::Use; typename llvm::cast_retty<To,
From>::ret_type = llvm::MemoryAccess*]: Assertion `isa<X>(Val) && "cast<Ty>()
argument of incompatible type!"' failed.
#0 0x0000000001e7ef0a (opt+0x1e7ef0a)
#1 0x0000000001e7cc7e (opt+0x1e7cc7e)
#2 0x0000000001e7cdf2 (opt+0x1e7cdf2)
#3 0x00007f9f1d26a390 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x11390)
#4 0x00007f9f1bfdd428 gsignal
/build/glibc-9tT8Do/glibc-2.23/signal/../sysdeps/unix/sysv/linux/raise.c:54:0
#5 0x00007f9f1bfdf02a abort /build/glibc-9tT8Do/glibc-2.23/stdlib/abort.c:91:0
#6 0x00007f9f1bfd5bd7 __assert_fail_base
/build/glibc-9tT8Do/glibc-2.23/assert/assert.c:92:0
#7 0x00007f9f1bfd5c82 (/lib/x86_64-linux-gnu/libc.so.6+0x2dc82)
#8 0x000000000236caa0 (opt+0x236caa0)
#9 0x0000000001c4505c (opt+0x1c4505c)
#10 0x0000000001c498fe (opt+0x1c498fe)
#11 0x0000000001c4a1c4 (opt+0x1c4a1c4)
#12 0x0000000001c4b25e (opt+0x1c4b25e)
#13 0x000000000197cf83 (opt+0x197cf83)
#14 0x000000000197d04c (opt+0x197d04c)
#15 0x000000000197caed (opt+0x197caed)
#16 0x00000000007aeeec (opt+0x7aeeec)
#17 0x00007f9f1bfc8830 __libc_start_main
/build/glibc-9tT8Do/glibc-2.23/csu/../csu/libc-start.c:325:0
#18 0x0000000000819459 (opt+0x819459)
Stack dump:
0.      Program arguments: opt -mem2reg -early-cse-memssa -o small-opt.bc
small.bc 
1.      Running pass 'Function Pass Manager' on module 'small.bc'.
2.      Running pass 'Early CSE w/ MemorySSA' on function '@fn1'
Aborted (core dumped)
$ 


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


int a;

void fn1 ()
{
  while (1)
    {
      short c = 1;
      if (c)
        break;
      a = a;
      if (a)
        continue;
    }
}

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

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