On Fri, Jan 27, 2017 at 05:38:17PM +0100, Jakub Jelinek wrote: > 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>
Thanks for doing this. It was still on my todo list :-/ > > 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. The subpass _is_ generic, I would move it like Kyrill says. Segher
