* mn10300/mn10300.c (expand_prologue): Rework so that eliminating

    * mn10300/mn10300.c (expand_prologue): Rework so that eliminating
        the frame pointer produces faster/smaller code.
        (expand_epilogue): Likewise.
        (initial_offset): New function for argument pointer and frame pointer
        elimination.
        * mn10300/mn10300.h (FIRST_PSEUDO_REGISTER): Bump to 10.
        (FIXED_REGISTERS): Add argument pointer register, it's a fake fixed
        register.
        (CALL_USED_REGISTERS, REG_ALLOC_ORDER): Corresponding changes.
        (REGNO_REG_CLASS, REG_CLASS_CONTENTS): Likewise.
        (REG_OK_FOR_BASE_P, REGISTER_NAMES): Likewise.
        (reg_class, REG_CLASS_NAMES): Delete unwanted DATA_OR_SP_REGS class.
        (PREFERRED_OUTPUT_RELOAD_CLASS): Define.
        (FIRST_PARM_OFFSET): No longer include register save area in
        computation.
        (STACK_POINTER_REGNUM): Is now register 9.
        (ARG_POINTER_REGNUM): Is now register 8.
        (FRAME_POINTER_REQUIRED): Refine.
        (ELIMINABLE_REGS, INITIAL_ELIMINATION_OFFSET): Define.
        (CAN_DEUG_WITHOUT_FP): Define.
        * mn10300/mn10300.md (return_internal): Break into two patterns.

        * mn10300/mn10300.h (CONST_OK_FOR_LETTER_P): Handle 'M' too.
        (REGISTER_MOVE_COST): Fix errors and refine.

        * mn10300/mn10300.c (notice_update_cc): SET_ZN_C0 insns leave the
        overflow bit in an unuseable state.  Rename CC_SET to CC_TST.
        * mn10300/mn10300.md (cc attributes): "set" is gone, replaced by
        "tst".  Update attributes on various insns.

        * mn10300/mn10300.md: Improve sign and zero extension instructions.
        (ashlsi3): Improve.  Handle address registers too.
        (add peephole): Combine two consecutive adjustments of a register
        into a single adjustment.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@13700 138bc75d-0d04-0410-961f-82ee72b054a4