[llvm-bugs] [Bug 33618] New: wrong code at -Os on x86_64-linux-gnu with "-mllvm -enable-newgvn"

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=33618

            Bug ID: 33618
           Summary: wrong code at -Os on x86_64-linux-gnu with "-mllvm
                    -enable-newgvn"
           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

It might be a dupe of or related to PR 33305. 

$ clang -v
clang version 5.0.0 (trunk 306403)
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 -Os small.c; ./a.out
$
$ clang -Os -mllvm -enable-newgvn small.c
$ ./a.out
Aborted (core dumped)
$


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


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

void fn1 ()
{ 
  int i = 0;
  for (; i < 3; i++)
    while (g > 7)
      if (b)
        goto L;
  for (; b < 1; b++)
    { 
      int *l = &h, *m;
      if (e)
        goto L;
      for (; j < 1; j++)
        { 
          int **n = &m;
          if (a)
            { 
              l = &f;
            L:
              if (d > 2)
                { 
                  for (k = 1; k; k = k)
                    c;
                  continue;
                }
            }
          *n = l;
          if (m != &h)
            __builtin_abort ();
        }
    }
}

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

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