> -----Original Message-----
> From: Jakub Jelinek [mailto:ja...@redhat.com]
> Sent: Wednesday, February 12, 2014 12:10 PM
> To: Iyer, Balaji V
> Cc: 'Jason Merrill'; 'Jeff Law'; 'Aldy Hernandez'; 'gcc-patches@gcc.gnu.org';
> 'r...@redhat.com'
> Subject: Re: [PING] [PATCH] _Cilk_for for C and C++
>
> On Wed, Feb 12, 2014 at 05:04:38PM +0000, Iyer, Balaji V wrote:
> > I looked at the test code you send me (cf3.cc) at -O1 and it is
> > removing all the lines you have shown above. Yes, I would imagine -O0
> > to have code that can be redundant or unnecessary. Some of it could
> > be the artifact of internal code insertion. But isn't the main job of
> > the instruction scheduler to remove all these redundant work?
> > Besides, it is just a function call. The compiler at -O2, -O and -O3
> > removes the chunk of code that you mentioned.
>
> As I said, just change the testcase so that the operator isn't inline, and
> suddenly even -O3 will not be able to remove the call.
I am sorry, I do not see any operators being asked to inline explicitly..
class I
{
public:
typedef ptrdiff_t difference_type;
I ();
~I ();
I (T *);
I (const I &);
T &operator * ();
T *operator -> ();
T &operator [] (const difference_type &) const;
I &operator = (const I &);
I &operator ++ ();
I operator ++ (int);
I &operator -- ();
I operator -- (int);
I &operator += (const difference_type &);
I &operator -= (const difference_type &);
I operator + (const difference_type &) const;
I operator - (const difference_type &) const;
template <typename S> friend bool operator == (I<S> &, I<S> &);
template <typename S> friend bool operator == (const I<S> &, const I<S> &);
template <typename S> friend bool operator < (I<S> &, I<S> &);
template <typename S> friend bool operator < (const I<S> &, const I<S> &);
template <typename S> friend bool operator <= (I<S> &, I<S> &);
template <typename S> friend bool operator <= (const I<S> &, const I<S> &);
template <typename S> friend bool operator > (I<S> &, I<S> &);
template <typename S> friend bool operator > (const I<S> &, const I<S> &);
template <typename S> friend bool operator >= (I<S> &, I<S> &);
template <typename S> friend bool operator >= (const I<S> &, const I<S> &);
template <typename S> friend typename I<S>::difference_type operator - (I<S>
&, I<S> &);
template <typename S> friend typename I<S>::difference_type operator - (const
I<S> &, const I<S> &);
template <typename S> friend I<S> operator + (typename I<S>::difference_type
, const I<S> &);
private:
T *p;
};
>
> Jakub
