* mn10300/mn10300.c (const_costs): Remove unused function.

    * mn10300/mn10300.c (const_costs): Remove unused function.
        * mn10300/mn10300.h (CONST_COSTS): Rework to generate better code.

        * mn10300/mn10300.c (print_operand): Handle 'H' and 'L' output
        modifers for high/low part of a 64bit value.
        * mn10300/mn10300.h (CONST_DOUBLE_OK_FOR_LETTER_P): Handle 'G'
        (LEGITIMATE_CONSTANT_P): Allow any constant.
        * mn10300/mn10300.md (movdi, movdf): Implement.
        (adddi3, subdi3): New expanders and patterns.

        * mn10300/mn10300.c (print_operand): Handle 'A' modifier for an
        address which can't be simple register indirect.
        * mn10300/mn10300.h (EXTRA_CONSTRAINT): Handle 'R' for bit ops.
        * mn10300/mn10300.md: Add several patterns to test, set and clear
        bitfields.

        * mn10300/mn10300.c (can_use_return_insn): New function.
        (expand_epilogue): Emit a RETURN insn if possible.
        * mn10300/mn10300.md (return): New pattern.

        * mn10300/mn10300.h (CONST_OK_FOR_LETTER_P): Handle 'N'.
        * mn10300/mn10300.md (andsi3): Catch "and 255,dn" and "and 65535,dn"
        which were not turned into zero_extend patterns.

        * mn10300/mn10300.h (GO_IF_LEGITIMATE_ADDRESS): Handle symbolic
        constant as an index/base too.

        * mn10300/mn10300.md (movsi): Allow SP to be loaded/saved with
        reg+d8 addresses.

        * mn10300/mn10300.md (cmpsi): Allow second operand to be a constant.
        (subsi3): Likewise.

        * mn10300/mn10300.md (sign extension patterns): Fix thinko when
        extending from memory.

        * mn10300/mn10300.md (tst peepholes): Add peepholes for test/branch
        based on N bit being set/clear and the data value being tested dies.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@13701 138bc75d-0d04-0410-961f-82ee72b054a4