[Bug tree-optimization/19726] New: suboptimal constructor generated

[yuri at tsoft dot com]

1. code below compiles into many instructions like "movl $0, 16(%eax)", should
have been "stosw" since all initializations are zeros. Even if one or two are
skipped in the middle still bulk stosw should be used.
2. Even when class E with external constructor uncommented this shouldn't change
since constructor can't change any data in C.

Yuri

----code----

class E {
//  int j;
  public: E();
};


class C {
  int h, i, j, k, l;
//  E e;
  int m, n, o, p, q, r, s, t, u, v;
public:
  C();
};

C::C() : h(0), i(0), j(), k(0), l(0), m(0), n(0), o(0), p(0), q(0), r(0), s(0),
t(0), u(0), v(0) { }

-- 
           Summary: suboptimal constructor generated
           Product: gcc
           Version: 3.4.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: yuri at tsoft dot com
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19726