[NDS32] Rewrite cost model.

gcc/
	* config/nds32/nds32-cost.c (rtx_cost_model_t): New structure.
	(insn_size_16bit, insn_size_32bit): New variables for cost evaluation.
	(nds32_rtx_costs_impl): Simplify.
	(nds32_address_cost_impl): Simplify.
	(nds32_init_rtx_costs): New function.
	(nds32_rtx_costs_speed_prefer): Likewise.
	(nds32_rtx_costs_size_prefer): Likewise.
	(nds32_address_cost_speed_prefer): Likewise.
	(nds32_address_cost_speed_fwprop): Likewise.
	(nds32_address_cost_size_prefer): Likewise.
	* config/nds32/nds32-protos.h (nds32_init_rtx_costs): Declare.
	* config/nds32/nds32.c (nds32_option_override): Use
	nds32_init_rtx_costs function.

Co-Authored-By: Chung-Ju Wu <jasonwucj@gmail.com>

From-SVN: r260411

gcc/ChangeLog

+2018-05-20  Kito Cheng  <kito.cheng@gmail.com>
+	    Chung-Ju Wu  <jasonwucj@gmail.com>
+
+	* config/nds32/nds32-cost.c (rtx_cost_model_t): New structure.
+	(insn_size_16bit, insn_size_32bit): New variables for cost evaluation.
+	(nds32_rtx_costs_impl): Simplify.
+	(nds32_address_cost_impl): Simplify.
+	(nds32_init_rtx_costs): New function.
+	(nds32_rtx_costs_speed_prefer): Likewise.
+	(nds32_rtx_costs_size_prefer): Likewise.
+	(nds32_address_cost_speed_prefer): Likewise.
+	(nds32_address_cost_speed_fwprop): Likewise.
+	(nds32_address_cost_size_prefer): Likewise.
+	* config/nds32/nds32-protos.h (nds32_init_rtx_costs): Declare.
+	* config/nds32/nds32.c (nds32_option_override): Use
+	nds32_init_rtx_costs function.
+
 2018-05-20  Chung-Ju Wu  <jasonwucj@gmail.com>
 
 	* config/nds32/nds32.c (nds32_asm_file_start): Output pipeline model.

gcc/config/nds32/nds32-protos.h

@@ -311,6 +311,7 @@ extern bool nds32_isr_function_p (tree);
 
 /* Auxiliary functions for cost calculation.  */
 
+extern void nds32_init_rtx_costs (void);
 extern bool nds32_rtx_costs_impl (rtx, machine_mode, int, int, int *, bool);
 extern int nds32_address_cost_impl (rtx, machine_mode, addr_space_t, bool);
 

gcc/config/nds32/nds32.c

@@ -4096,6 +4096,7 @@ nds32_option_override (void)
 	       "must be enable '-mext-fpu-sp' or '-mext-fpu-dp'");
     }
 
+  nds32_init_rtx_costs ();
 
   nds32_register_passes ();
 }