[llvm-bugs] [Bug 33339] New: wrong code at -Os and above in CFLAA on x86_64-linux-gnu (with either "-mllvm -use-cfl-aa=anders" or "-mllvm -use-cfl-aa=steens")

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=33339

            Bug ID: 33339
           Summary: wrong code at -Os and above in CFLAA on
                    x86_64-linux-gnu (with either "-mllvm
                    -use-cfl-aa=anders" or "-mllvm -use-cfl-aa=steens")
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: su at cs.ucdavis.edu
                CC: llvm-bugs at lists.llvm.org

The current trunk and 3.9.x miscompile this test, but 4.0.x do not (neither do
3.8.x as it appears). 

$ clang -v
clang version 5.0.0 (trunk 304811) (llvm/trunk 304810)
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 -w small.c; ./a.out
$ clang-4.0.0 -Os -mllvm -use-cfl-aa=anders -w small.c; ./a.out
$ 
$ clang -Os -mllvm -use-cfl-aa=steens -w small.c; ./a.out
Aborted (core dumped)
$ clang -Os -mllvm -use-cfl-aa=anders -w small.c; ./a.out
Aborted (core dumped)
$ 


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


int a, b, *c, d, e, *f;

int fn1 (int p)
{
  return p;
}

int main ()
{
  int *g;
  if (d)
    goto L;
  int **h = &g;
  f = &a;
  int *i; 
  while (b)
    {
      fn1 (!i);
      &e != &i;
    L:
      c = g;
    }
  *h = f;
  if (g != &a)
    __builtin_abort ();
  return 0; 
}

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