Lattice Mico32 port

[Jon Beniston]

Thanks for the feedback Richard. The attached patch should address pretty
much everything you have mentioned, except for adding this:

(define_insn "*ashlsi3_const"
   [(set (match_operand:SI 0 "register_operand" "=R1")
         (ashift:SI (match_operand:SI 1 "register_operand" "0")
                    (match_operand:SI 2 "const_5bit_operand" "i")))
    (clobber (match_scratch:SI 3 "=RA"))]
   "!TARGET_BARREL_SHIFT_ENABLED"
   "calli	__ashlsi3_%2"
   [(set_attr "type" "call")])


As I kept on getting "unable to find a register to spill in class R1" and
wasn't sure how to fix it. As you say, this is something that can be added
later. I've also fixed a few other issues that have cropped up during
testing.

Cheers,
Jon

ChangeLog

gcc/
2009-09-28  Jon Beniston <jon@beniston.com>

        * config.gcc: Add lm32 elf and uclinux targets.
        * config/lm32: New directory.
        * config/lm32/arithmetic.c: New file.
        * config/lm32/crti.S: New file.
        * config/lm32/crtn.S: New file.
        * config/lm32/lib1funcs.S: New file.
        * config/lm32/lm32.c: New file.
        * config/lm32/lm32.h: New file.
        * config/lm32/lm32.md: New file.
        * config/lm32/lm32.opt: New file.
        * config/lm32/lm32-protos.h: New file.
        * config/lm32/predicates.md: New file.
        * config/lm32/sfp-machine.h: New file.
        * config/lm32/t-fprules-softfp: New file.
        * config/lm32/t-lm32: New file.
        * config/lm32/uclinux-elf.h: New file.
        * doc/invoke.texi: Document lm32 options. 
        * doc/contrib.texi: Document lm32 porter.
        * doc/install.texi: Document lm32 targets.

gcc/testsuite/
2009-09-28  Jon Beniston <jon@beniston.com>

        * lib/target-supports.exp (check_profiling_available): lm32 target 
          doesn't support profiling.
        * gcc.dg/20020312-2.c: Add lm32 support.
        * g++.dg/other/packed1.C: Expect to fail on lm32.        
        * g++.old-deja/g++.jason/thunk3.C: Likewise.                 

libgcc/
2009-09-28  Jon Beniston <jon@beniston.com>

        * config.host: Add lm32 targets.
        * config/lm32: New directory.
        * config/lm32/t-elf: New file.
        * config/lm32/t-uclinux: New file.
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