[LLVMbugs] [Bug 11966] New: possible union bug

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=11966

             Bug #: 11966
           Summary: possible union bug
           Product: new-bugs
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: regehr at cs.utah.edu
                CC: gohman at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified


I don't know that this is a bug, but wanted to get a couple people to look at
it.  

All non-LLVM compilers that I tested (5 or so) print "1" at all optimization
levels.  

Clang prints "0" at -O2.



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

union U0 {
  short f0;
  int f1;
} b;

union U0 *c = &b;

int main ()
{
  b.f0 = 0;
  c->f1 = 1;
  printf ("%d\n", b.f0);
  return 0;
}

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