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[Bug middle-end/54896] optimization slowness on large basic blocks
- From: "rguenth at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Wed, 13 Mar 2013 09:53:06 +0000
- Subject: [Bug middle-end/54896] optimization slowness on large basic blocks
- Auto-submitted: auto-generated
- References: <bug-54896-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54896
--- Comment #9 from Richard Biener <rguenth at gcc dot gnu.org> 2013-03-13 09:53:06 UTC ---
(In reply to comment #8)
> With r196576 on x86_64 (gcc17):
>
> at -O1:
> alias stmt walking : 30.99 (36%) usr
> reload CSE regs : 18.94 (22%) usr
> CSE : 14.94 (17%) usr
> tree DSE : 9.32 (11%) usr
>
> at -O2:
> alias stmt walking : 46.65 (30%) usr
> reload CSE regs : 37.92 (25%) usr
> CSE 2 : 29.09 (19%) usr
> CSE : 15.02 (10%) usr
>
> at -O3:
> tree slp vectorization : 129.79 (61%) usr
> alias stmt walking : 46.52 (22%) usr
I have patches for the SLP vectorization part, queued for 4.9.