Hi,

Please find the attached patch "cr16-gcc.patch" that adds compiler 
support for National Semiconductor's CR16 Architecture.
	
The following link provides an insight into previous attempts,
http://gcc.gnu.org/ml/gcc-patches/2007-09/msg01806.html

These sources have been updated and enhanced to suit latest version
of gcc branch.

The binutils and gdb-sim support were added at the following links
http://sourceware.org/ml/binutils/2007-06/msg00260.html
http://sourceware.org/ml/gdb-patches/2008-02/msg00253.html

Newlib support for this target was added recently by KPIT and 
the patches have been accepted in latest sources,
http://sourceware.org/ml/newlib/2010/msg00596.html

CR16 target port characteristics:
         | Characteristics 
Target   | HMSLQNFICBD lqrcpfgmbdates
---------+---------------------------
cr16     |    L  FI    l  cp g         

The CR16 compiler has been validated against gcc-testsuite. I will 
submit the results to gcc-testsuite mailing list soon.

Please review the patch and let me know if there should be any 
modifications in it.

gcc/ChangeLog:
--------------
2010-12-21	Sumanth G <sumanth.gundapaneni@kpitcummins.com>
		Jayant R Sonar <jayant.sonar@kpitcummins.com>
		
	* config.gcc: Add cr16-* support.

	* doc/extend.texi: Document cr16 extensions.
	* doc/install.texi: Document cr16 install.
	* doc/invoke.texi: Document cr16 options.
	* doc/md.texi: Document cr16 constraints.

	* config/cr16/cr16.c: New file.
	* config/cr16/cr16.h: New file.
	* config/cr16/cr16.md: New file.
	* config/cr16/cr16.opt: New file.
	* config/cr16/cr16-libgcc.s: New file.
	* config/cr16/cr16-protos.h: New file.
	* config/cr16/crti.s: New file.
	* config/cr16/crtlibid.s: New file.
	* config/cr16/crtn.s: New file.
	* config/cr16/divmodhi3.c: New file.
	* config/cr16/predicates.md: New file.
	* config/cr16/t-cr16: New file.
	* config/cr16/unwind-dw2-cr16.c: New file.
	* config/cr16/unwind-dw2.h: New file. 

libgcc/ChangeLog:
-----------------
2010-12-21  Sumanth G <sumanth.gundapaneni@kpitcummins.com>
		Jayant R Sonar <jayant.sonar@kpitcummins.com>

	*config.host: Add National Semiconductor CR16 target (cr16-*-*).
		
libstdc++-v3/ChangeLog:
-----------------------
2010-12-21  Sumanth G <sumanth.gundapaneni@kpitcummins.com>
		Jayant R Sonar <jayant.sonar@kpitcummins.com>

	*configure: Add National Semiconductor CR16 target (cr16-*-*).		
	*crossconfig.m4 : Add support for National Semiconductor CR16 target.

ChangeLog:
----------
2010-12-21  Sumanth G <sumanth.gundapaneni@kpitcummins.com>
		Jayant R Sonar <jayant.sonar@kpitcummins.com>

	* config.sub: Add National Semiconductor CR16 target.
	* configure.ac: Add National Semiconductor CR16 target.
	* configure: Regenerate
   
Thanks in advance,
Sumanth G,
KPIT Cummins Infosystems Limited,
PUNE (India).