[Patch, fortran] PR20541 - allocatable components (TR15541)

[Tobias Schlüter]

Hi Paul,

Paul Biggar <paul.biggar@gmail.com> wrote on Fri, 06 Oct 2006:
> As an aside, I'm starting to look at this sort of thing for escape
> analysis for stack allocation. As is, I'm using alloca. However, I
> believe that there is no specfic requirement to dynamically allocate
> on the stack using alloca, and that doing so would hinder the use of
> -fomit-frame-pointer?
>
> I'm afraid I don't understand this patch too well, nor the problem
> it's solving, but I'm wondering are you preallocating space on the
> stack by increasing the frame size at compile time, or are you
> fiddling with the frame pointer at run time, or some other way? If the
> former, it seems this has benefits over using alloca.

Paul Thomas' and Erik's patch uses gfortran's memory allocation  
infrastructure which allocates memory on the heap.  There's no  
requirement in the TR or the Fortran standard at all on how to  
allocate memory, and it says nothing about -fomit-frame-pointer.  For  
implementation details of gcc's __builtin_alloca, you are probably  
better off asking on the gcc mailing list.

- Tobi

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