> + <li>In GCC-4.9 and earlier releases PIC hard register was fixed > + and was not used for other purposes when PIC code was > + generated. Reuse of PIC hard register was implemented in RA > + for GCC-5.0. It improves generated PIC code performance as > + more hard registers can be used. As an example, shared > + libraries and OS Android would significantly benefit from > + such optimization. Currently it is switched on only for > + x86/x86-64 targets. As RA infrastructure is already > + implemented for PIC register reuse, other targets might > + follow this in the future.</li>
PIC was always huge performance disaster on x86, I suppose with this patch in, -fPIC benchmarks should improve quite noticeably ;) Thanks! Honza
