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Re: Need an older gcc version on my cygwin due to poor performance on gcc-3.x series.
- From: Danny Smith <dannysmith at clear dot net dot nz>
- To: "Gerrit P. Haase" <gp at familiehaase dot de>, Danny Smith <dannysmith at users dot sourceforge dot net>
- Cc: Cygwin <cygwin at cygwin dot com>, waterthrill at yahoo dot no
- Date: Mon, 01 Nov 2004 15:55:29 +1300
- Subject: Re: Need an older gcc version on my cygwin due to poor performance on gcc-3.x series.
- References: <000701c4bf79$fe5d1e40$316d65da@DANNY> <4185480F.3080807@familiehaase.de>
- Reply-to: Danny Smith <dannysmith at users dot sourceforge dot net>
Gerrit P. Haase wrote:
> Danny Smith wrote:
>
>> Gerrit wrote:
>>
>>
>>> Ole Jacob Hagen wrote:
>>
>>
>>>> Hi,
>>>>
>>>> I've compiled Octave-2.1.60 with gcc-3.3.3 successfully, but the
>>>> performance is pretty bad with gcc-3.3.3.
>>>> The performance should of Octave is much better, when compiling it
>>>> with gcc-3.2.x instead.
>>
>>
>>> It would make more sense to identify the problem and do s.th.
>>> about it to resolve this issue then.
>>
>>
>> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14563
>
> Wow, this is an interesting story about exception handling.
>
> What I'm asking myself now:
>
> Should we try again to use dwarf2 exceptions?
>
My personal builds of gcc-3.4.x are bullt with dwarf2 EH enabled. No
problems But I don't use w32 callbacks within functions that throw. I
had never even thought of doing that, but I don't think much.anymore
> Should we try to find the reason why SjLj exceptions are slower on
> Cygwin than for the rest of the world?
>
Most of the rest of the GCC world has abandoned sjlj EH as inefficient
Look within function prologues.
Danny
>
> Gerrit
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