Convert pdp11 back end to CCmode.

Convert pdp11 back end to CCmode.

	* common/config/pdp11/pdp11-common.c (pdp11_handle_option): Handle
	mutually exclusive options.
	* config/pdp11/constraints.md (h): New constraint.
	(O): Update definition to match shift code generation.
	(D): New constraint.
	* config/pdp11/pdp11-modes.def (CCNZ): Define mode.
	(CCFP): Remove.
	* config/pdp11/pdp11-protos.h (int_no_side_effect_operand): New
	function.
	(output_jump): Change arguments.
	(pdp11_fixed_cc_regs): New function.
	(pdp11_cc_mode): Ditto.
	(pdp11_expand_shift): Ditto.
	(pdp11_assemble_shift): Ditto.
	(pdp11_small_shift): Ditto.
	(pdp11_branch_cost): Remove.
	* config/pdp11/pdp11.c (pdp11_assemble_integer): Remove comments
	from output.
	(pdp11_register_move_cost): Update for CC registers.
	(pdp11_rtx_costs): Add case for LSHIFTRT.
	(pdp11_output_jump): Add CCNZ mode conditional branches.
	(notice_update_cc_on_set): Remove.
	(pdp11_cc_mode): New function.
	(simple_memory_operand): Correct pre/post decrement case.
	(no_side_effect_operand): New function.
	(pdp11_regno_reg_class): Add CC_REGS class.
	(pdp11_fixed_cc_regs): New function.
	(pdp11_small_shift): New function.
	(pdp11_expand_shift): New function to expand shift insns.
	(pdp11_assemble_shift): New function to output shifts.
	(pdp11_branch_cost): Remove.
	(pdp11_modes_tieable_p): Make QI/HI modes tieable.
	* config/pdp11/pdp11.h (SIZE_TYPE): Ensure 16-bit type.
	(WCHAR_TYPE): Ditto.
	(PTRDIFF_TYPE): Ditto.
	(ADJUST_INSN_LENGTH): New macro.
	(FIXED_REGISTERS): Add CC registers.
	(CALL_USED_REGISTERS): Ditto.
	(reg_class): Ditto.
	(REG_CLASS_NAMES): Ditto.
	(REG_CLASS_CONTENTS): Ditto.
	(SELECT_CC_MODE): Use new function.
	(TARGET_FLAGS_REGNUM): New macro.
	(TARGET_FIXED_CONDITION_CODE_REGS): Ditto.
	(cc0_reg_rtx): Remove.
	(CC_STATUS_MDEP): Remove.
	(CC_STATUS_MDEFP_INIT): Remove.
	(CC_IN_FPU): Remove.
	(NOTICE_UPDATE_CC): Remove.
	(REGISTER_NAMES): Add CC registers.
	(BRANCH_COST): Change to constant 1.
	* config/pdp11/pdp11.md: Rewrite for CCmode condition code
	handling.
	* config/pdp11/pdp11.opt (mbcopy): Remove.
	(mbcopy-builtin): Remove.
	(mbranch-cheap): Remove.
	(mbranch-expensive): Remove.
	* config/pdp11/predicates.md (expand_shift_operand): Update to
	match shift code generation.
	(ccnz_operator): New predicate.
	* doc/invoke.texi (PDP-11 Options): Remove deleted options
	-mbcopy, -mbcopy-builtin, -mbranch-cheap, -mbranch-expensive.
	Remove non-existent option -mabshi, -mno-abshi.  Document mutually
	exclusive options.
	* doc/md.texi (PDP-11): Document new D and h constraints.  Update
	description of O constraint.

From-SVN: r262198