bugPSPP - Bugs: bug #24597, Reduce size of struct variable


bug #24597: Reduce size of struct variable

Submitted by:  Ben Pfaff <blp>
Submitted on:  Sat 18 Oct 2008 03:27:48 AM UTC  
Category:  Compilation/Portability Severity:  1 - Wishlist
Status:  Fixed Assigned to:  Ben Pfaff <blp>
Open/Closed:  Closed Release:  None
Effort:  0.00

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Sat 14 May 2011 04:40:59 AM UTC, comment #2: 

I think this is probably a waste of time in an era of 4 GB machines, so I'm closing it.

I wholeheartedly agree with John's comment, though.

Ben Pfaff <blp>
Project AdministratorIn charge of this item.
Wed 27 Oct 2010 04:03:56 PM UTC, comment #1: 

It would also be nice if we could get rid of the aux and aux_dtor members, which IMO are a bit of a kludge.

John Darrington <jmd>
Project Administrator
Sat 18 Oct 2008 03:27:48 AM UTC, original submission:  

On x86-32, struct variable is 184 bytes.  This could be reduced considerably:

  • 68 bytes of that is the variable name, which could be allocated via pointer
  • 24 bytes is print and write formats, which really only need 3 or 4 bytes each
  • 32 bytes is missing values, which should be reducible to a pointer or at most to 8 bytes
  • Alignment, measurement, and, leave each occupy 4 bytes and none needs more than 1.
  • Width and display width shouldn't need more than 2 bytes each.

It should therefore be possible to reduce its size to something closer to 64 bytes (modulo any wastage from allocatig the name via pointer).  This may be a useful savings when we start allocating large numbers of variables.

Ben Pfaff <blp>
Project AdministratorIn charge of this item.


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    Follow 2 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2011-05-14 blp StatusNone => Fixed
        Open/ClosedOpen => Closed

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