[NDS32] Implment USE_LOAD_POST_INCREMENT, USE_LOAD_POST_DECREMENT,…

[NDS32] Implment USE_LOAD_POST_INCREMENT, USE_LOAD_POST_DECREMENT, USE_STORE_POST_DECREMENT and USE_STORE_POST_INCREMENT.

gcc/
	* config/nds32/nds32-protos.h (nds32_use_load_post_increment): Declare.
	* config/nds32/nds32.c (nds32_use_load_post_increment): New.
	* config/nds32/nds32.h
	(USE_LOAD_POST_INCREMENT, USE_LOAD_POST_DECREMENT): Define.
	(USE_STORE_POST_INCREMENT, USE_STORE_POST_DECREMENT): Define.

From-SVN: r259552

gcc/ChangeLog

 2018-04-22  Shiva Chen  <shiva0217@gmail.com>
 
+	* config/nds32/nds32-protos.h (nds32_use_load_post_increment): Declare.
+	* config/nds32/nds32.c (nds32_use_load_post_increment): New.
+	* config/nds32/nds32.h
+	(USE_LOAD_POST_INCREMENT, USE_LOAD_POST_DECREMENT): Define.
+	(USE_STORE_POST_INCREMENT, USE_STORE_POST_DECREMENT): Define.
+
+2018-04-22  Shiva Chen  <shiva0217@gmail.com>
+
 	* config/nds32/nds32-protos.h (nds32_ls_333_p): Remove.
 	* config/nds32/nds32.c (nds32_ls_333_p): Remove.
 

gcc/config/nds32/nds32-protos.h

@@ -275,6 +275,8 @@ rtx extract_branch_target_rtx (rtx_insn *);
 rtx extract_branch_condition_rtx (rtx_insn *);
 } // namespace nds32
 
+extern bool nds32_use_load_post_increment(machine_mode);
+
 /* Functions for create nds32 specific optimization pass.  */
 extern rtl_opt_pass *make_pass_nds32_relax_opt (gcc::context *);
 

gcc/config/nds32/nds32.c

@@ -1354,6 +1354,14 @@ nds32_naked_function_p (tree func)
   return (t != NULL_TREE);
 }
 
+/* Function that determine whether a load postincrement is a good thing to use
+   for a given mode.  */
+bool
+nds32_use_load_post_increment (machine_mode mode)
+{
+  return (GET_MODE_SIZE (mode) <= GET_MODE_SIZE(E_DImode));
+}
+
 /* Function that check if 'X' is a valid address register.
    The variable 'STRICT' is very important to
    make decision for register number.

gcc/config/nds32/nds32.h

@@ -1083,6 +1083,12 @@ enum reg_class
 /* We have "LW.bi   Rt, [Ra], Rb" instruction form.  */
 #define HAVE_POST_MODIFY_REG  1
 
+#define USE_LOAD_POST_INCREMENT(mode) \
+  nds32_use_load_post_increment(mode)
+#define USE_LOAD_POST_DECREMENT(mode) USE_LOAD_POST_INCREMENT(mode)
+#define USE_STORE_POST_DECREMENT(mode) USE_LOAD_POST_DECREMENT(mode)
+#define USE_STORE_POST_INCREMENT(mode) USE_LOAD_POST_INCREMENT(mode)
+
 #define CONSTANT_ADDRESS_P(x) (CONSTANT_P (x) && GET_CODE (x) != CONST_DOUBLE)
 
 #define MAX_REGS_PER_ADDRESS 3