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[Bug tree-optimization/64434] [5 Regression] Performance regression after operand canonicalization (r216728).
- From: "rguenther at suse dot de" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Wed, 14 Jan 2015 09:45:19 +0000
- Subject: [Bug tree-optimization/64434] [5 Regression] Performance regression after operand canonicalization (r216728).
- Auto-submitted: auto-generated
- References: <bug-64434-4 at http dot gcc dot gnu dot org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64434
--- Comment #13 from rguenther at suse dot de <rguenther at suse dot de> ---
On Tue, 13 Jan 2015, jakub at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64434
>
> Jakub Jelinek <jakub at gcc dot gnu.org> changed:
>
> What |Removed |Added
> ----------------------------------------------------------------------------
> CC| |jakub at gcc dot gnu.org
>
> --- Comment #12 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
> Shouldn't you cache the result of count_num_stmt in some SSA_NAME_VERSION
> indexed vector? Otherwise it can be expensive on pathological testcases.
> And with the caching I'd hope it should be cheap enough that you could do that
> even outside of loops.
Yes, see my patch review