Added configure variable STACK_CACHE_REGS and set useful defaults

  currently supported: 0-4 regs, default reg 0-4.

Makefile.in

@@ -113,6 +113,7 @@ XLDFLAGS = @LDFLAGS@
 LDFLAGS	=  $(DEBUGFLAG) $(XLDFLAGS)
 LDLIBS	= @LIBS@
 
+STACK_CACHE_REGS = @STACK_CACHE_REGS@
 STACK_CACHE_DEFAULT_FAST = @STACK_CACHE_DEFAULT_FAST@
 
 # ------------	Install Directories
@@ -763,8 +764,8 @@ prim.b:		prim cache0.vmg
 		$(M4) -Dcondbranch_opt=0 $(srcdir)/prim >$@
 		sleep 1 #should make hpux-workaround unnecessary
 
-prim-fast.b:	prim cache-fast$(STACK_CACHE_DEFAULT_FAST).vmg peeprules.vmg Makefile.in
-		$(M4) -Dcondbranch_opt=@condbranch_opt@ -DSTACK_CACHE_FILE=cache-fast$(STACK_CACHE_DEFAULT_FAST).vmg $(srcdir)/prim >$@
+prim-fast.b:	prim cache-fast$(STACK_CACHE_DEFAULT_FAST).vmg cache-regs$(STACK_CACHE_REGS).vmg peeprules.vmg Makefile
+		$(M4) -Dcondbranch_opt=@condbranch_opt@ -DSTACK_CACHE_FILE=cache-fast$(STACK_CACHE_DEFAULT_FAST).vmg -DSTACK_CACHE_REGS=cache-regs$(STACK_CACHE_REGS).vmg $(srcdir)/prim >$@
 		sleep 1 #should make hpux-workaround unnecessary
 
 $(FORTH_GEN_ENGINE_FAST): prim-fast.b prims2x.fs

cache-fast0.vmg

@@ -55,12 +55,7 @@
 \E state S7
 \E state S8
 
-\E S3 state-disable
-\E S4 state-disable
-\E S5 state-disable
-\E S6 state-disable
-\E S7 state-disable
-\E S8 state-disable
+include(STACK_CACHE_REGS)
 
 \E ss0 data-stack S0 set-ss
 \E ss1 data-stack S1 set-ss

cache-fast1.vmg

-\ stack cache setup
+\ stack cache setup: default state S1
 
 \ Copyright (C) 2003,2004,2005,2006,2007 Free Software Foundation, Inc.
 
@@ -59,12 +59,7 @@
 \E state S7
 \E state S8
 
-\E S3 state-disable
-\E S4 state-disable
-\E S5 state-disable
-\E S6 state-disable
-\E S7 state-disable
-\E S8 state-disable
+include(STACK_CACHE_REGS)
 
 \E ss0 data-stack S0 set-ss
 \E ss1 data-stack S1 set-ss

cache-fast2.vmg

@@ -55,6 +55,8 @@
 \E state S7
 \E state S8
 
+include(STACK_CACHE_REGS)
+
 \E ss0 data-stack S0 set-ss
 \E ss1 data-stack S1 set-ss
 \E ss2 data-stack S2 set-ss

cache-fast3.vmg

@@ -55,6 +55,8 @@
 \E state S7
 \E state S8
 
+include(STACK_CACHE_REGS)
+
 \E ss0 data-stack S0 set-ss
 \E ss1 data-stack S1 set-ss
 \E ss2 data-stack S2 set-ss

cache-fast4.vmg

@@ -55,6 +55,8 @@
 \E state S7
 \E state S8
 
+include(STACK_CACHE_REGS)
+
 \E ss0 data-stack S0 set-ss
 \E ss1 data-stack S1 set-ss
 \E ss2 data-stack S2 set-ss

cache-regs1.vmg

+\ stack cache diablers: maximun state S1
+
+\ Copyright (C) 2008 Free Software Foundation, Inc.
+
+\ This file is part of Gforth.
+
+\ Gforth is free software; you can redistribute it and/or
+\ modify it under the terms of the GNU General Public License
+\ as published by the Free Software Foundation, either version 3
+\ of the License, or (at your option) any later version.
+
+\ This program is distributed in the hope that it will be useful,
+\ but WITHOUT ANY WARRANTY; without even the implied warranty of
+\ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+\ GNU General Public License for more details.
+
+\ You should have received a copy of the GNU General Public License
+\ along with this program. If not, see http://www.gnu.org/licenses/.
+
+\E S2 state-disable
+\E S3 state-disable
+\E S4 state-disable
+\E S5 state-disable
+\E S6 state-disable
+\E S7 state-disable
+\E S8 state-disable

cache-regs2.vmg

+\ stack cache diablers: maximun state S2
+
+\ Copyright (C) 2008 Free Software Foundation, Inc.
+
+\ This file is part of Gforth.
+
+\ Gforth is free software; you can redistribute it and/or
+\ modify it under the terms of the GNU General Public License
+\ as published by the Free Software Foundation, either version 3
+\ of the License, or (at your option) any later version.
+
+\ This program is distributed in the hope that it will be useful,
+\ but WITHOUT ANY WARRANTY; without even the implied warranty of
+\ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+\ GNU General Public License for more details.
+
+\ You should have received a copy of the GNU General Public License
+\ along with this program. If not, see http://www.gnu.org/licenses/.
+
+\E S3 state-disable
+\E S4 state-disable
+\E S5 state-disable
+\E S6 state-disable
+\E S7 state-disable
+\E S8 state-disable

cache-regs3.vmg

+\ stack cache diablers: maximun state S3
+
+\ Copyright (C) 2008 Free Software Foundation, Inc.
+
+\ This file is part of Gforth.
+
+\ Gforth is free software; you can redistribute it and/or
+\ modify it under the terms of the GNU General Public License
+\ as published by the Free Software Foundation, either version 3
+\ of the License, or (at your option) any later version.
+
+\ This program is distributed in the hope that it will be useful,
+\ but WITHOUT ANY WARRANTY; without even the implied warranty of
+\ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+\ GNU General Public License for more details.
+
+\ You should have received a copy of the GNU General Public License
+\ along with this program. If not, see http://www.gnu.org/licenses/.
+
+\E S4 state-disable
+\E S5 state-disable
+\E S6 state-disable
+\E S7 state-disable
+\E S8 state-disable

cache-regs4.vmg

+\ stack cache diablers: maximun state S4
+
+\ Copyright (C) 2008 Free Software Foundation, Inc.
+
+\ This file is part of Gforth.
+
+\ Gforth is free software; you can redistribute it and/or
+\ modify it under the terms of the GNU General Public License
+\ as published by the Free Software Foundation, either version 3
+\ of the License, or (at your option) any later version.
+
+\ This program is distributed in the hope that it will be useful,
+\ but WITHOUT ANY WARRANTY; without even the implied warranty of
+\ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+\ GNU General Public License for more details.
+
+\ You should have received a copy of the GNU General Public License
+\ along with this program. If not, see http://www.gnu.org/licenses/.
+
+\E S5 state-disable
+\E S6 state-disable
+\E S7 state-disable
+\E S8 state-disable

configure.in

@@ -120,8 +120,9 @@ else
 fi])
 
 #variables mentioned in INSTALL
-AC_ARG_VAR(CC, [The C compiler (must support GNU C 2.x); gcc-2.95 recommended.])
+AC_ARG_VAR(CC, [The C compiler (must support GNU C 2.x).])
 AC_ARG_VAR(FORTHSIZES, [Gforth command line options for the default stack and dictionary sizes (see INSTALL).])
+AC_ARG_VAR(STACK_CACHE_REGS, [number of registers in the maximum stack cache state for gforth-fast and gforth-native (default platform-dependent).])
 AC_ARG_VAR(STACK_CACHE_DEFAULT_FAST, [number of registers in the default stack cache state for gforth-fast and gforth-native (default 1).])
 AC_ARG_VAR(GCC_PR15242_WORKAROUND, [Force the enabling (1) or disabling (0) of a workaround for a gcc-3.x performance bug (default unset: use workaround for gcc-3.x)])
 
@@ -314,6 +315,9 @@ case "$host_cpu" in
 		test x$ac_cv_sizeof_long_long = x && 
 		($CC -v 2>&1 |grep -q 'gcc version 2.95') &&
 		ac_cv_sizeof_long_long=0
+                #The only architecture with enough callee-saved registers
+                test x$STACK_CACHE_REGS = x && STACK_CACHE_REGS=3
+                #or use 2, hardly slower at run-time and starts up faster
 		;;
 	*)
 		AC_MSG_WARN([Using a generic machine description])
@@ -348,6 +352,11 @@ then
 fi
 AC_SUBST(MAKEINC)
 
+AC_ARG_VAR(STACK_CACHE_REGS, [number of registers in the maximum stack cache state for gforth-fast and gforth-native (default platform-dependent).])
+
+test x$STACK_CACHE_REGS = x && STACK_CACHE_REGS=1
+AC_DEFINE_UNQUOTED(STACK_CACHE_REGS, $STACK_CACHE_REGS,
+		   [number of registers in the maximum stack cache state for gforth-fast and gforth-native])
 test x$STACK_CACHE_DEFAULT_FAST = x && STACK_CACHE_DEFAULT_FAST=1
 AC_DEFINE_UNQUOTED(STACK_CACHE_DEFAULT_FAST, $STACK_CACHE_DEFAULT_FAST,
 		   [number of registers in the default stack cache state for gforth-fast and gforth-native])