[Bug target/29797] New: Miscompiles bit test / set in OpenOffice

[rguenth at gcc dot gnu dot org]

extern "C" void abort(void);
unsigned bar(void) { return 32768;}
void foobar (unsigned u) { if (u != (32768 | 65536)) abort (); }
const char *name (void) { return "QPopupMenu"; }
int main()
{
  unsigned nStyle = bar ();
  const char *pClassName = name ();
  if (__builtin_strcmp ("QPopupMenu", pClassName) == 0)
   {
    bool is_enabled = bool (nStyle & 1);
    if (nStyle & 32768)
      nStyle |= 65536;
    foobar(nStyle);
   }
  return 0;
}

is miscompiled at -O1 and -O2 on ppc32 (ppc64 is ok).


-- 
           Summary: Miscompiles bit test / set in OpenOffice
           Product: gcc
           Version: 4.1.2
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: blocker
          Priority: P3
         Component: target
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: rguenth at gcc dot gnu dot org
GCC target triplet: powerpc32-*-*


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29797