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* [Bug tree-optimization/39299]  New: wrong PTA for structure copies
@ 2009-02-25 11:11 rguenth at gcc dot gnu dot org
  2009-02-25 13:08 ` [Bug tree-optimization/39299] " rguenth at gcc dot gnu dot org
                   ` (4 more replies)
  0 siblings, 5 replies; 6+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2009-02-25 11:11 UTC (permalink / raw)
  To: gcc-bugs

At -O2 -fno-tree-sra we compute y.p as pointing to nothing.  Which causes
the abort to trigger on alias-improvements branch.

struct X
{
  long l1;
  struct Y
  {
    long l2;
    int *p;
  } y;
};
int i;
int foo (struct X *x)
{
  struct Y y = x->y;
  *y.p = 0;
  i = 1;
  return *y.p;
}
extern void abort (void);
int main()
{
  struct X x;
  x.y.p = &i;
  if (foo(&x) != 1)
    abort ();
  return 0;
}


-- 
           Summary: wrong PTA for structure copies
           Product: gcc
           Version: 4.4.0
            Status: UNCONFIRMED
          Keywords: wrong-code, alias
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: rguenth at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39299


^ permalink raw reply	[flat|nested] 6+ messages in thread
end of thread, other threads:[~2009-04-03 10:37 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2009-02-25 11:11 [Bug tree-optimization/39299] New: wrong PTA for structure copies rguenth at gcc dot gnu dot org
2009-02-25 13:08 ` [Bug tree-optimization/39299] " rguenth at gcc dot gnu dot org
2009-02-26 10:11 ` rguenth at gcc dot gnu dot org
2009-02-26 10:11 ` rguenth at gcc dot gnu dot org
2009-04-03 10:28 ` rguenth at gcc dot gnu dot org
2009-04-03 10:37 ` rguenth at gcc dot gnu dot org

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