Albert ARIBAUD <albert.arib...@free.fr> wrote on 2010/10/13 08:30:33: > > Le 12/10/2010 23:00, Joakim Tjernlund a écrit : > > > Yes, but the difference isn't really the arch. It is the -mrelocatable > > flag that is the big difference. > > Not only: obviously, implementing GOT relocation is not done the same on
> both archs, and it simply is not beneficial on ARM wrt PPC in terms of > instructions. I did a pretty extensive run of tests with and without > -fPIC and -fPIE on ARM, and GOT relocation clearly makes code bigger, > whereas it does not PPC. Did you use -msingle-pic-base too with -fpic/-fPIC? This is what makes a difference(together with -fpic). The most interesting size is the total flash size IMHO. Reducing insn's in RAM at the expense of flash is not what most users need I think. > > This simply implies that -fPIC is a better choice for PPC (and hence > -mrelocatable) while -fpie is a better one for ARM. -fPIC isn't optimal(it is bigger) but until my gcc patch gets into gcc one cannot use -fpic(it gets promoted to -fPIC by gcc). -fpic is smaller but one cannot build apps has has a GOT over 32KB with that _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
