[Bug ld/18829] Add the ability to sort PLT entries

[gregory.d.bentley at intel dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=18829

--- Comment #7 from Greg Bentley <gregory.d.bentley at intel dot com> ---
(In reply to H.J. Lu from comment #6)
> (In reply to Greg Bentley from comment #5)
> > (In reply to Alexander Monakov from comment #3)
> > > As I understand, for further benefit you should sort the GOT as well as 
> > > PLT
> > > based on the same idea — and that will save you some dcache misses even 
> > > with
> > > -fno-plt.
> > 
> > That's correct. However, I didn't see a noticeable difference with my
> > workload from improving the GOT cache behavior. My previous patch resulted
> > in sorted GOTs except when -z bndplt was used. I've fixed that in the patch
> > just uploaded.
> 
> I want to avoid adding changes like that unless GCC -fno-plt
> option isn't sufficient.

A colleague of mine is testing -fno-plt. I'll report back with the results
soon.

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