🚀 go-pugleaf

In article <1992Dec22.023221.1664@cs.cornell.edu> cchase@cs.cornell.edu (Craig Chase) writes:
>killoran@ll.mit.edu (Mike Killoran) writes:
>>We are trying to simulate a large chip (~700,000 transistors) with
>>irsim.  There are many (almost 7,000) parallel transistors making 
>>up the clock distribution cell.  When simulating this chip, irsim
>>gives the following complaint about all of the parallel transistors:
>
>>No problem, just edit conn_list.c, increase MAX_PARALLEL to 7000.
>>Do the same in globals.h and then recompile.  No problem.  Right?
>
>We had the problem with parallel transistors as well and fixed it by 
>dynamically allocating the array and increasing its size as needed.  What 
>follows is a context diff.  The first diff (to cad_dir.c) Is not really 
>to your problem, but I include it anyway.  (BTW, these fixes were done 
>by Christos Zoulas a couple years ago).
>
>Good luck,
>mark linderman (linder@ee.cornell.edu)
>

Since I was mentioned in this posting :-), I have to say that I did
send this fix to Arturo Salz two years ago and it never made it to the
irsim distribution. I think that the patch Mark posted is backwards
[patch will say that you need to apply -R]. It is missing a very
important part. In net.h you'll need to change n_par to something
larger than a character, otherwise you'll be indexing random values
when the number of parallel transistors goes above 127.  Here's a
forward patch to that...

I don't know if this is the latest version of irsim, maybe Mark can
give us a clue about which version of irsim these patches are for, and
the author can tell us which version of irsim he is running?

Mark should also recompile irsim in the cad account :-)....

G'night,

christos

*** net.h.orig	Thu Sep 13 16:39:48 1990
--- net.h	Tue Dec 22 01:19:12 1992
***************
*** 156,162 ****
      char     ttype;		     /* type of transistor */
      char     state;		     /* cache to remember current state */
      char     tflags; 		     /* transistor flags */
!     char     n_par;		     /* index into parallel list */
      Resists  r;			     /* transistor resistances */
      long     x, y;		     /* position in the layout (optional) */
      tptr     tlink;		     /* next txtor in position hash table */
--- 156,162 ----
      char     ttype;		     /* type of transistor */
      char     state;		     /* cache to remember current state */
      char     tflags; 		     /* transistor flags */
!     unsigned short n_par;	     /* index into parallel list */
      Resists  r;			     /* transistor resistances */
      long     x, y;		     /* position in the layout (optional) */
      tptr     tlink;		     /* next txtor in position hash table */