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Re: [PATCH][6/n] tree LIM TLC
On Tue, 12 Mar 2013, Steven Bosscher wrote:
> On Tue, Mar 12, 2013 at 4:25 PM, Richard Biener wrote:
> >
> > (Un-?)surprisingly the most effective compile-time reduction for
> > the testcase in PR39326 is to employ ao_ref caching for
> > alias oracle queries and caching of expanded affine-combinations
> > for affine disambiguations.
> >
> > This reduces compile-time to a manageable amount in the first place
> > for me (so I'm sending it "late" in the series).
>
> I suppose this renders my LIM patch obsolete.
Not really - it's still
tree loop invariant motion: 588.31 (78%) usr
so limiting the O(n^2) dependence testing is a good thing. But I
can take it over from here and implement that ontop of my patches
if you like.
> Did you also look at the memory foot print?
Yeah, unfortunately processing outermost loops separately doesn't
reduce peak memory consumption. I'll look into getting rid of the
all-refs bitmaps, but I'm not there yet.
Currently the testcase peaks at 1.7GB for me (after LIM, then
it gets worse with DSE and IRA). And I only tested -O1 sofar.
Thanks,
Richard.