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Subject: calling subroutines

Author: John Coffey

Date: 13:49:07 10/05/98

Like most chess programs, I have a data structure that represents the current
state of the board.  Some programs have bitboards, but instead I use information
for each square.  My data structure could easily grow into 300 to 500 bytes.

I am just now starting to write my search routines.  If I am in my routine
"SearchForWhite()" and it tries a move and then calls "SearchForBlack()" (These
names are hypothetical at this point) then it needs to pass the current state
of the board to "SearchForBlack()."

Question:

Is it more efficient to ....

1.  Only have one copy of the current state, and have "SearchForBlack()"
restore the board back to its previous state before returning to
"SearchforWhite()"?

or

2.  "SearchForWhite" passes the whole data structure on the stack as a copy of
the original so that "SearchForBlack()" doesn't have to restore the board?

John Coffey

Re: calling subroutines Don Dailey 11:47:22 10/06/98
Re: calling subroutines Frank Schneider 06:50:07 10/06/98
- Re: calling subroutines Roberto Waldteufel 08:55:01 10/06/98
  - Re: calling subroutines Ernst A. Heinz 10:21:57 10/06/98
    - Re: calling subroutines Roberto Waldteufel 10:48:50 10/06/98
  - Re: calling subroutines Robert Hyatt 10:06:32 10/06/98
    - Re: calling subroutines Roberto Waldteufel 10:41:15 10/06/98
      - Re: calling subroutines Robert Hyatt 11:27:17 10/06/98
        
        Re: calling subroutines Roberto Waldteufel 15:10:17 10/06/98
        
        Re: calling subroutines John Coffey 11:50:39 10/06/98
        
        Re: calling subroutines Robert Hyatt 13:35:37 10/06/98
        
        Re: calling subroutines James Robertson 13:32:38 10/06/98
        
        Re: calling subroutines Robert Hyatt 13:49:58 10/06/98
        
        Re: calling subroutines John Coffey 11:59:18 10/06/98
        
        Re: calling subroutines Robert Hyatt 13:36:27 10/06/98
        
        Re: calling subroutines James Robertson 13:06:42 10/06/98
        
        Bitboards and evaluation? John Coffey 12:06:32 10/06/98
        
        Re: Bitboards and evaluation? Robert Hyatt 13:42:55 10/06/98
        
        Re: Bitboards and evaluation? Ernst A. Heinz 13:15:48 10/06/98
        
        Re: Bitboards and evaluation? James Robertson 13:00:11 10/06/98
        
        Re: Bitboards and evaluation? Robert Hyatt 13:46:57 10/06/98
        
        Re: Bitboards and evaluation? James Robertson 20:39:38 10/06/98
        
        Re: Bitboards and evaluation? Robert Hyatt 20:58:11 10/06/98
  - Re: calling subroutines John Coffey 09:43:03 10/06/98
Re: calling subroutines Robert Hyatt 14:02:05 10/05/98
- bytes per second? John Coffey 14:05:38 10/05/98
  - Re: bytes per second? Robert Hyatt 17:53:05 10/05/98
    - Re: bytes per second? John Coffey 18:56:31 10/05/98

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