On 12/1/06, Richard Guenther <[EMAIL PROTECTED]> wrote:
On 12/1/06, Uros Bizjak <[EMAIL PROTECTED]> wrote:
> Hello!
>
> At least on x86_64 and i686 SPEC score [1] and polyhedron [2] scores
> dropped noticeably. For SPEC benchmarks, mgrid, galgel, ammp and
> sixtrack tests are affected and for polygedron, ac (second regression
> in the peak) and protein (?) regressed in that time frame.
>
> [1] http://www.suse.de/~aj/SPEC/amd64/CFP/summary-britten/recent.html
> [2]
http://www.suse.de/~gcctest/c++bench/polyhedron/polyhedron-summary.txt-2-0.html
>
> Does anybody have any idea what is going on there?
It correlates with the PPRE introduction (enabled at -O3 only) which might
increase register pressure, but also improves Polyhedron rnflow a lot.
Feel free to disable it and let me know if it helps.
If it's really affecting scores that badly, i'm happy to turn it off
until we can deal with the register pressure (though i thought we had
out-of-ssa changes to help with this now).
