[AArch64] Cortex-A57 Choose some new branch costs.

gcc/

	* config/aarch64/aarch64.c (cortexa57_branch_costs): New.
	(cortexa57_tunings): Use it.

From-SVN: r230409

gcc/ChangeLog

+2015-11-16  James Greenhalgh  <james.greenhalgh@arm.com>
+
+	* config/aarch64/aarch64.c (cortexa57_branch_costs): New.
+	(cortexa57_tunings): Use it.
+
 2015-11-16  Christian Bruel  <christian.bruel@st.com>
 
 	PR target/65837

gcc/config/aarch64/aarch64.c

@@ -338,6 +338,13 @@ static const struct cpu_branch_cost generic_branch_cost =
   2   /* Unpredictable.  */
 };
 
+/* Branch costs for Cortex-A57.  */
+static const struct cpu_branch_cost cortexa57_branch_cost =
+{
+  1,  /* Predictable.  */
+  3   /* Unpredictable.  */
+};
+
 static const struct tune_params generic_tunings =
 {
   &cortexa57_extra_costs,
@@ -393,7 +400,7 @@ static const struct tune_params cortexa57_tunings =
   &cortexa57_addrcost_table,
   &cortexa57_regmove_cost,
   &cortexa57_vector_cost,
-  &generic_branch_cost,
+  &cortexa57_branch_cost,
   4, /* memmov_cost  */
   3, /* issue_rate  */
   (AARCH64_FUSE_MOV_MOVK | AARCH64_FUSE_ADRP_ADD