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Re: Switching to C++ by default in 4.8
On 4/10/12, Richard Guenther <richard.guenther@gmail.com> wrote:
> On Apr 9, 2012 Lawrence Crowl <crowl@google.com> wrote:
> > On 4/9/12, Jakub Jelinek <jakub@redhat.com> wrote:
> > > On Mon, Apr 09, 2012 at 10:55:46AM -0700, Lawrence Crowl wrote:
> > > > A build conversion to C++ is a precondition to any source
> > > > change using C++, though the two could be bundled into
> > > > one patch. In any event, I agree that the conversion
> > > > needs to provide value. Vectors and hash tables are a good
> > > > early target.
> > >
> > > Hash tables? Ugh, what is wrong with the hash tables we have
> > > right now in GCC?
> >
> > Lots of boiler plate involving casting to void*. Some of that
> > boiler plate makes the optimizer less effective.
>
> Optimizers ignore pointer types, so that assertion cannot be true.
The standard says they need not ignore them.
I was thinking more about iterating over the contents. What in the
current code is an indirect function call inside of a loop becomes
mostly be inline functions in a C++ iterator style. The loop is now
fully graspable by the optimizer.
--
Lawrence Crowl