[PATCH] [AArch64] Distinct costs for sign and zero extension

gcc/

	* config/aarch64/aarch64-protos.h (cpu_addrcost_table): Split member
	for register extension into sign and zero register extension.
	* config/aarch64/aarch64.c (generic_addrcost_table): Infer values
	for sign and zero register extension.
	(cortexa57_addrcost_table): Likewise.
	(xgene1_addrcost_table): Likewise.

From-SVN: r229431

gcc/ChangeLog

+2015-10-27  Evandro Menezes  <e.menezes@samsung.com>
+
+	* config/aarch64/aarch64-protos.h (cpu_addrcost_table): Split member
+	for register extension into sign and zero register extension.
+	* config/aarch64/aarch64.c (generic_addrcost_table): Infer values
+	for sign and zero register extension.
+	(cortexa57_addrcost_table): Likewise.
+	(xgene1_addrcost_table): Likewise.
+
 2015-10-27  Richard Sandiford  <richard.sandiford@arm.com>
 
 	* fold-const.c (fold_minmax): Delete.

gcc/config/aarch64/aarch64-protos.h

@@ -134,7 +134,8 @@ struct cpu_addrcost_table
   const int pre_modify;
   const int post_modify;
   const int register_offset;
-  const int register_extend;
+  const int register_sextend;
+  const int register_zextend;
   const int imm_offset;
 };
 

gcc/config/aarch64/aarch64.c

@@ -194,7 +194,8 @@ static const struct cpu_addrcost_table generic_addrcost_table =
   0, /* pre_modify  */
   0, /* post_modify  */
   0, /* register_offset  */
-  0, /* register_extend  */
+  0, /* register_sextend  */
+  0, /* register_zextend  */
   0 /* imm_offset  */
 };
 
@@ -209,7 +210,8 @@ static const struct cpu_addrcost_table cortexa57_addrcost_table =
   0, /* pre_modify  */
   0, /* post_modify  */
   0, /* register_offset  */
-  0, /* register_extend  */
+  0, /* register_sextend  */
+  0, /* register_zextend  */
   0, /* imm_offset  */
 };
 
@@ -224,7 +226,8 @@ static const struct cpu_addrcost_table xgene1_addrcost_table =
   1, /* pre_modify  */
   0, /* post_modify  */
   0, /* register_offset  */
-  1, /* register_extend  */
+  1, /* register_sextend  */
+  1, /* register_zextend  */
   0, /* imm_offset  */
 };
 
@@ -5530,9 +5533,12 @@ aarch64_address_cost (rtx x,
 	cost += addr_cost->register_offset;
 	break;
 
-      case ADDRESS_REG_UXTW:
       case ADDRESS_REG_SXTW:
-	cost += addr_cost->register_extend;
+	cost += addr_cost->register_sextend;
+	break;
+
+      case ADDRESS_REG_UXTW:
+	cost += addr_cost->register_zextend;
 	break;
 
       default: