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From: "trippels at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/59892] out of bounds array access is misoptimized
Date: Mon, 20 Jan 2014 18:47:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59892

Markus Trippelsdorf <trippels at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
                 CC|                            |trippels at gcc dot gnu.org
         Resolution|---                         |INVALID

--- Comment #2 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
struct isci_host;
struct isci_orom;

struct isci_pci_info {
  struct isci_host *hosts[2];
  struct isci_orom *orom;
} v = {{(struct isci_host *)1,(struct isci_host *)1}, 0};

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

int isci_pci_probe()
{
  int i;
  struct isci_host *isci_host;

  for (i = 0, isci_host = v.hosts[i];
       i < 2 && isci_host;
       isci_host = v.hosts[++i]) {
    printf("(%d < %d) == %d\n", i, 2, (i < 2));
  }

  return 0;
}

int main()
{
  isci_pci_probe();
}

When v.hosts[0] or v.hosts[1] is NULL the loop is fine, so there is
no reason for a warning.
The testcase is obviously invalid.