On Fri, Jan 27, 2017 at 04:34:53PM +0000, Kyrill Tkachov wrote:
> > +
> > <h3 id="powerpc">PowerPC / PowerPC64 / RS6000</h3>
> > <ul>
> > <li>The PowerPC port now uses LRA by default.</li>
> > <li>GCC now diagnoses inline assembly that clobbers register r2.
> > This has always been invalid code, and is no longer quietly
> > tolerated.</li>
> > + <li>Shrink-wrapping optimization can now separate portions of
> > + prologues and epilogues to improve performance if some of the
> > + work done traditionally by prologues and epilogues is not needed
> > + on certain paths. This is controlled by the
> > + <code>-fshrink-wrap-separate</code> option, enabled by default.</li>
> > </ul>
>
> AArch64 also implements these hooks and so benefits from the optimisation as
> well.
> Perhaps move this to the general optimizer improvements section and mention
> it's only
> enabled for powerpc and aarch64 for the moment?
Yeah, I've also noticed that, but not sure what is better, as it is only 2
targets that support it, so it is not really generic enough. It is unclear what
is better.
Jakub
