[llvm-bugs] [Bug 33322] New: wrong code at -Os and above in CFL AA on x86_64-linux-gnu (with "-mllvm -use-cfl-aa=anders")

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=33322

            Bug ID: 33322
           Summary: wrong code at -Os and above in CFL AA on
                    x86_64-linux-gnu (with "-mllvm -use-cfl-aa=anders")
           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

$ clang -v
clang version 5.0.0 (trunk 304725)
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=anders -w small.c
$ ./a.out
a.out: small.c:15: main: Assertion `j' failed.
Aborted (core dumped)
$


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


void __assert_fail(const char *, const char *, unsigned int, const char *);

int a, b, c, d;

int main ()
{ 
  for (; a < 1; a++)
    { 
      int *j;
      while (b)
        ;
      int **k = &j;
    L:
      *k = &c;
      j ? (void) 0 : __assert_fail ("j", "small.c", 15, "main");
      while (b)
        { 
          int *m[2];
          m[a];
        N:
          if (b)
            goto L;
          j = m[1];
        }
    }
  while (c)
    goto N;
  return 0;
}

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