[llvm-bugs] [Bug 35025] New: wrong code at -O3 with -fexperimental-new-pass-manager

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=35025

            Bug ID: 35025
           Summary: wrong code at -O3 with -fexperimental-new-pass-manager
           Product: clang
           Version: unspecified
          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

Tested with trunk rev. 316262. 

$ clangpolly -v
clang version 6.0.0 (http://llvm.org/git/clang.git
a6d3ef724655a64ac137945615d3ff002c4f7993) (http://llvm.org/git/llvm.git
3aad6fd98b60114347bcfdeaeded7987ec5b629e)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/su/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
$ 
$ clangpolly -fexperimental-new-pass-manager -O2 -w small.c; ./a.out
2
2
$ 
$ clangpolly -fexperimental-new-pass-manager -O3 -w small.c; ./a.out
2
0
$ 


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


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

int a, b, c, d, e, *f, **g = &f, ***k = &g, h, j, l, o, p;
short i[2], m, n;

int r (int s)
{
  return a < 0 || s ? s : s << a;
}

static void t (int *s)
{
  for (e = 0; e < 5; e++)
    {
      int *u = &b;
      for (j = 0; j < 2; j++)
        i[j] = 0;
      for (l = 0; l < 2; l++)
        {
          int *v = &c;
          **k = s;
          for (d = 0; d < 5; d++)
            for (m = 0; m < 2; m++)
              {
                short *w = &n;
                (i[m] |= j) <= (*w |= *u = r ((short) (*v |= 6) >> h));
                o = *s;
                if (o)
                  break;
              }
        }
    }
}

void x ()
{
  int *q = &b;
  t (q);
}

int main ()
{
  x ();
  for (; p < 2; p++)
    printf ("%d\n", i[0]);
  return 0;
}

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