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[Bug middle-end/38474] [4.3/4.4 Regression] slow compilation at -O0 (callgraph optimization, inline heuristics, expand )
- From: "jv244 at cam dot ac dot uk" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 17 Dec 2008 08:36:16 -0000
- Subject: [Bug middle-end/38474] [4.3/4.4 Regression] slow compilation at -O0 (callgraph optimization, inline heuristics, expand )
- References: <bug-38474-6642@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #31 from jv244 at cam dot ac dot uk 2008-12-17 08:36 -------
(In reply to comment #30)
> I think redoing this with 4.4.0 would be useful, to check if new code (like
> IRA) uses this kind of non-linear algorithms. But the register renaming patch
> hasn't changed between 4.3 and 4.4, so I would compile with
> -fno-rename-registers ;-)
>
thanks for the '-fno-rename-registers' trick, something like that is not
obvious to beginners. I tried with 4.4, but virtual memory usage went to 9Gb,
so I'll have to run it on a larger machine. I can't remember seeing this with
4.3, but I'll test.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38474