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made classical 1-register stack caching work again (and probably
  general stack caching with non-empty canonical state).  There was a
  subtle bug involving ?DUP-?BRANCH.
made this the default for gforth-fast and turned off anything beyond
deleted the now-unused rewrite_bb().

    1: \ stack cache setup
    2: 
    3: \ Copyright (C) 2003 Free Software Foundation, Inc.
    4: 
    5: \ This file is part of Gforth.
    6: 
    7: \ Gforth is free software; you can redistribute it and/or
    8: \ modify it under the terms of the GNU General Public License
    9: \ as published by the Free Software Foundation; either version 2
   10: \ of the License, or (at your option) any later version.
   11: 
   12: \ This program is distributed in the hope that it will be useful,
   13: \ but WITHOUT ANY WARRANTY; without even the implied warranty of
   14: \ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   15: \ GNU General Public License for more details.
   16: 
   17: \ You should have received a copy of the GNU General Public License
   18: \ along with this program; if not, write to the Free Software
   19: \ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
   20: 
   21: \E register IPTOS Cell
   22: \E register spTOS Cell
   23: \  \E register spb Cell
   24: \  \E register spc Cell
   25: \  \E register spd Cell
   26: 
   27: \E create IPregs IPTOS ,
   28: \ \E create regs spc , spb , spTOS ,
   29: \E create regs spTOS ,
   30: 
   31: \E IPregs 1 0 stack-state IPss1
   32: \ \E regs 3 cells + 0  -1 stack-state ss0
   33: \ \E regs 2 cells + 1  0 stack-state ss1
   34: \ \E regs 1 cells + 2  1 stack-state ss2
   35: \ \E regs 0 cells + 3  2 stack-state ss3
   36: \E regs 1  0 stack-state ss1
   37: 
   38: \ the first of these is the default state (for now)
   39: \ \E state S0
   40: \E state S1
   41: \ \E state S2
   42: \ \E state S3
   43: 
   44: \  \E ss0 data-stack S0 set-ss
   45: \E ss1 data-stack S1 set-ss
   46: \  \E ss2 data-stack S2 set-ss
   47: \  \E ss3 data-stack S3 set-ss
   48: 
   49: \  \E IPss1 inst-stream S0 set-ss
   50: \E IPss1 inst-stream S1 set-ss
   51: \  \E IPss1 inst-stream S2 set-ss
   52: \  \E IPss1 inst-stream S3 set-ss
   53: 
   54: \E data-stack to cache-stack
   55: \  \E here 4 cache-states 2! s0 , s1 , s2 , s3 ,
   56: \E here 1 cache-states 2! s1 ,
   57: 
   58: \ !! the following should be automatic
   59: \E S1 to state-default
   60: \E state-default to state-in
   61: \E state-default to state-out