| Re: [eigen] alloca on MSVC |
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- To: eigen@xxxxxxxxxxxxxxxxxxx
- Subject: Re: [eigen] alloca on MSVC
- From: Benoit Jacob <jacob.benoit.1@xxxxxxxxx>
- Date: Fri, 5 Mar 2010 14:30:36 -0500
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2010/3/5 Hauke Heibel <hauke.heibel@xxxxxxxxxxxxxx>:
> I quickly looked into _malloca.
>
> First, MSVC is using it's own threshold for choosing between heap and
> stack allocation. It is defined by _ALLOCA_S_MARKER_SIZE which is set
> to 1024. We could use _alloca to be able to use Eigen's threshold
> (20k) though this function is declared as deprecated. On the other
> hand side MSVC is using _alloca internally.
>
> While looking into this, I also stumbled over something strange in
> Memory.h. There the definition of ei_aligned_stack_delete contains a
> do {} while(0) loop - why?
Trick to group multilpe statements like a {...} so you can use this
macro after a if(), while still requiring the user to not forget the
semicolon (;).
>
> I am also getting stack corruptions in product_notemporary but
> hopefully I can fix that tomorrow, right now I am in a hurry.
>
> - Hauke
>
>
>