[PATCH] enable fdpic targets/emulations for sh*-*-linux*

[Segher Boessenkool]

On Sun, Oct 04, 2015 at 12:32:54PM +0900, Oleg Endo wrote:
> > I think we should focus on the big performance problem that would make
> > a much much bigger difference: very bad codegen by gcc. Aside from
> > lack of shrink-wrapping, poor hanling of the PIC register (like the
> > way x86 used to handle %ebx, as permanently-reserved and unusable)
> > stands out at something that needs to be fixed.
> 
> Shrink wrapping is being done for all backends.  In fact, it has been
> improved recently.  Of course there could be some SH specific cases
> which aren't optimized well.  Please open PRs in GCC's bugzilla for
> issues with the compiler.

If the prologue sets up a register that is used pretty much everywhere
(like a PIC register) we cannot shrink-wrap much.  After shrink-wrapping
you always still have a single prologue (and epilogue).

Your problem might be different; I can't tell without examples.


Segher