on Sun Sep 06 2009, Mathias Gaunard <loufoque-AT-gmail.com> wrote:

> On 5 sep, 07:01, George Neuner <gneun...@comcast.net> wrote:
>
>> >Unless you're targeting 64-bit windows, you're not testing a
>> >particularly good EH implementation.
>>
>> ??? 64-bit Windows uses the same SEH implementation as 32-bit.
>>
>> C++ EH is slightly faster than Windows SEH. In VS2008 you can choose
>> which to use. If you mean the 64-bit compiler has a better C++ EH
>> implementation, then I have to plead ignorance ... I'll have to look
>> into it.
>
> I found a fairly interesting presentation on exception-handling with
> Visual C++ (it's for 2005 though):
> www.nwcpp.org/Downloads/2006/ehc.ppt

Unless they made VS2008-compiled code link-incompatible with
VS2005-compiled code, it would be hard for them to have changed much
about how this works.

> explains differences between SEH and C++ exception handling, on x86 or
> x86-64, with examples and their generated assembly.

Wow, that's slide set is fantastic. They really go into the details of
the MS implementation.

Note: Their C++ EH for x64 seems to have a few (probably negligible)
overheads, but it's not at all obvious to me why those overheads
should be needed.

--
Dave Abrahams
BoostPro Computing
http://www.boostpro.com

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