[llvm-bugs] [Bug 33410] New: wrong code at -O1 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=33410

            Bug ID: 33410
           Summary: wrong code at -O1 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

This one seems interesting as it affects all versions from 3.9.x to trunk and
both "anders" and "steens", so I'm reporting it. 


$ 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 -O1 -w small.c; ./a.out
0
$ 
$ clang -O1 -mllvm -use-cfl-aa=steens -w small.c; ./a.out
Aborted (core dumped)
$ clang -O1 -mllvm -use-cfl-aa=anders -w small.c; ./a.out
Aborted (core dumped)
$ 


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


int printf (const char *, ...); 

int a, b, c, *d, *e, *g = &c, i, ***j, k;
static int ****f;
int **volatile h = &g;

void fn1 (int);

int fn2 ()
{
  fn1 (0);
  if (b >= 0)
    return i;
  while (1)
    *e = *d = 0;
}

void fn1 (int q)
{
  int *n = 0, **o[7] = { &n };
  for (; k < 2; k++)
    {
      j = &o[6];
      *h = n;
      if (g)
        __builtin_abort ();
    }
  if (q)
    {
      ***f;
      int *****p = &f;
      if (p[3])
        ;
    }
}

int main ()
{
  fn2 ();
  printf ("%d\n", a);
  return 0;
}

-- 
You are receiving this mail because:
You are on the CC list for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-bugs/attachments/20170612/e1a33324/attachment-0001.html>