C-SKY: Add fpuv3 instructions and CK860 arch.

C-SKY: Add fpuv3 instructions and CK860 arch.

gcc/ChangeLog:

	* config/csky/constraints.md ("W"): New constriant for mem operand
	with base reg, index register.
	("Q"): Renamed and modified "csky_valid_fpuv2_mem_operand" to
	"csky_valid_mem_constraint_operand" to deal with both "Q" and "W"
	constraint.
	("Dv"): New constraint for const double value that can be used at
	fmovi instruction.
	* config/csky/csky-modes.def (HFmode): New mode.
	* config/csky/csky-protos.h (csky_valid_fpuv2_mem_operand): Rename
	to "csky_valid_mem_constraint_operand" and support new constraint
	"W".
	(csky_get_movedouble_length): New.
	(fpuv3_output_move): New.
	(fpuv3_const_double): New.
	* config/csky/csky.c (csky_option_override): New arch CK860 with fpv3.
	(decompose_csky_address): Refine.
	(csky_print_operand): New "CONST_DOUBLE" operand.
	(csky_output_move): Support fpv3 instructions.
	(csky_get_movedouble_length): New.
	(fpuv3_output_move): New.
	(fpuv3_const_double): New.
	(csky_emit_compare): Cover float comparsion.
	(csky_emit_compare_float): Refine.
	(csky_vaild_fpuv2_mem_operand): Rename to
	"csky_valid_mem_constraint_operand" and support new constraint "W".
	(ck860_rtx_costs): New.
	(csky_rtx_costs): Add the cost calculation of CK860.
	(regno_reg_class): New vregs for fpuv3.
	(csky_dbx_regno): Likewise.
	(csky_cpu_cpp_builtins): New builtin macro for fpuv3.
	(csky_conditional_register_usage): Suporrot fpuv3.
	(csky_dwarf_register_span): Suporrot fpuv3.
	(csky_init_builtins, csky_mangle_type): Support "__fp16" type.
	(ck810_legitimate_index_p): Support fp16.
	* config/csky/csky.h (TARGET_TLS): ADD CK860.
	(CSKY_VREG_P, CSKY_VREG_LO_P, CSKY_VREG_HI_P): Support fpuv3.
	(TARGET_SINGLE_FPU): Support fpuv3.
	(TARGET_SUPPORT_FPV3): New.
	(FIRST_PSEUDO_REGISTER): Change to 202 to hold the new fpuv3 registers.
	(FIXED_REGISTERS, CALL_REALLY_USED_REGISTERS, REGISTER_NAMES,
	 REG_CLASS_CONTENTS): Support fpuv3.
	* config/csky/csky.md (movsf): Move to cksy_insn_fpu.md and refine.
	(csky_movsf_fpv2): Likewise.
	(ck801_movsf): Likewise.
	(csky_movsf): Likewise.
	(movdf): Likewise.
	(csky_movdf_fpv2): Likewise.
	(ck801_movdf): Likewise.
	(csky_movdf): Likewise.
	(movsicc): Refine. Use "comparison_operatior" instead of
	"ordered_comparison_operatior".
	(addsicc): Likewise.
	(CSKY_FIRST_VFP3_REGNUM, CSKY_LAST_VFP3_REGNUM): New constant.
	(call_value_internal_vh): New.
	* config/csky/csky_cores.def (CK860): New arch and cpu.
	(fpv3_hf): New.
	(fpv3_hsf): New.
	(fpv3_sdf): New.
	(fpv3): New.
	* config/csky/csky_insn_fpu.md: Refactor. Separate all float patterns
	into emit-patterns and match-patterns, remain the emit-patterns here,
	and move the match-patterns to csky_insn_fpuv2.md or
	csky_insn_fpuv3.md.
	* config/csky/csky_insn_fpuv2.md: New file for fpuv2 instructions.
	* config/csky/csky_insn_fpuv3.md: New file and new patterns for fpuv3
	isntructions.
	* config/csky/csky_isa.def (fcr): New.
	(fpv3_hi): New.
	(fpv3_hf): New.
	(fpv3_sf): New.
	(fpv3_df): New.
	(CK860): New definition for ck860.
	* config/csky/csky_tables.opt (ck860): New processors ck860,
	ck860f. And new arch ck860.
	(fpv3_hf): New.
	(fpv3_hsf): New.
	(fpv3_hdf): New.
	(fpv3): New.
	* config/csky/predicates.md (csky_float_comparsion_operator): Delete
	"geu", "gtu", "leu", "ltu", which will never appear at float comparison.
	* config/csky/t-csky-elf: Support 860.
	* config/csky/t-csky-linux: Likewise.
	* doc/md.texi: Add "Q" and "W" constraints for C-SKY.