This is the mail archive of the
gcc-patches@gcc.gnu.org
mailing list for the GCC project.
Re: [tree-ssa] Reduce resizing of PHI nodes, create less garbage
On Wed, Dec 03, 2003 at 05:03:53PM -0700, law@redhat.com wrote:
> Well, if you replace it with the zone allocator, you still don't want to
> be doing 80k PHI resizings -- that's ultimately wasteful no matter what
> allocation scheme is underneath.
True.
> So I expect you'll still want the manager to do some kind of bumping-up of
> the initial requested PHI lengths. The exact details of how much we increase
> the initial request might change since we don't have GC pages where we can
> increase "for free". Then again, the details of how much we increase may
> not change significantly. It's hard to tell at this point.
*shrug* Powers of 2 are only rarely bad. Occasionally better are
powers of 2 minus some internal header overhead. I don't think it
matters much here.
> I'm not planning on further tuning of that code.
Ok.
> I ultimately didn't add that capability as my suspicion is that it's
> over-engineering for what we need.
Probably.
r~