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Re: [tree-ssa] Miscompilation (SIGSEGV) with -ffast-math (!?), huge compile time regression
- From: law at redhat dot com
- To: Diego Novillo <dnovillo at redhat dot com>
- Cc: Richard Guenther <rguenth at tat dot physik dot uni-tuebingen dot de>, "gcc at gcc dot gnu dot org" <gcc at gcc dot gnu dot org>
- Date: Mon, 23 Feb 2004 08:53:40 -0700
- Subject: Re: [tree-ssa] Miscompilation (SIGSEGV) with -ffast-math (!?), huge compile time regression
- Reply-to: law at redhat dot com
In message <1077549687.3219.121.camel@localhost.localdomain>, Diego Novillo wri
tes:
>On Mon, 2004-02-23 at 09:01, Richard Guenther wrote:
>
>> g++ (GCC) 3.5-tree-ssa 20040217 (merged 20040211) endlessly loops,
>> g++ (GCC) 3.5-tree-ssa 20040209 (merged 20040126) is fine. Note that
>> between these two a huge compile time regression occoured, 20040209
>> takes 6m36s, 20040217 over 12m!
>>
>Yeah, it certainly takes a while to build (roughly 4m30s on a 2.2Ghz P4
>w/ 1Gb of RAM). It also makes cc1plus to grow quite big (about 480Mb).
>
>The biggest time consumers according to -ftime-report are
>
> dominator optimization: 47.83 (20%) usr 0.27 ( 4%) sys 48.29 (20%) wall
> expand : 46.79 (20%) usr 0.08 ( 1%) sys 46.95 (19%) wall
> tree DSE : 23.53 (10%) usr 0.01 ( 0%) sys 23.55 (10%) wall
> tree SSA rewrite : 16.31 ( 7%) usr 0.00 ( 0%) sys 16.31 ( 7%) wall
> integration : 13.86 ( 6%) usr 0.07 ( 1%) sys 13.93 ( 6%) wall
Care to pass along an oprofile function dump?
jeff