[Patch AArch64 Obvious] Unify branch costs to generic_branch_cost

All the cores in AArch64 use the pair {1, 3} for their branch costs. As
that is covered by generic_branch_cost, we can just use that directly and
save the tiny amount of redundant code. If in future any core wants to
modify this, they can always add a special-case branch-cost back.

gcc/

	* config/aarch64/aarch64.c (cortexa57_branch_cost): Remove.
	(thunderx2t99_branch_cost): Likewise.
	(cortexa35_tunings): Update to use generic_branch_cost.
	(cortexa53_tunings): Likewise.
	(cortexa57_tunings): Likewise.
	(cortexa72_tunings): Likewise.
	(cortexa73_tunings): Likewise.
	(thunderx2t99_tunings): Likewise.

From-SVN: r250582

gcc/ChangeLog

+2017-07-26  James Greenhalgh  <james.greenhalgh@arm.com>
+
+	* config/aarch64/aarch64.c (cortexa57_branch_cost): Remove.
+	(thunderx2t99_branch_cost): Likewise.
+	(cortexa35_tunings): Update to use generic_branch_cost.
+	(cortexa53_tunings): Likewise.
+	(cortexa57_tunings): Likewise.
+	(cortexa72_tunings): Likewise.
+	(cortexa73_tunings): Likewise.
+	(thunderx2t99_tunings): Likewise.
+
 2017-07-26  Sebastian Huber  <sebastian.huber@embedded-brains.de>
 
 	* config/sparc/sparc.c (dump_target_flag_bits): Dump MASK_FSMULD.

gcc/config/aarch64/aarch64.c

@@ -488,20 +488,6 @@ static const struct cpu_branch_cost generic_branch_cost =
   3   /* Unpredictable.  */
 };
 
-/* Branch costs for Cortex-A57.  */
-static const struct cpu_branch_cost cortexa57_branch_cost =
-{
-  1,  /* Predictable.  */
-  3   /* Unpredictable.  */
-};
-
-/* Branch costs for Vulcan.  */
-static const struct cpu_branch_cost thunderx2t99_branch_cost =
-{
-  1,  /* Predictable.  */
-  3   /* Unpredictable.  */
-};
-
 /* Generic approximation modes.  */
 static const cpu_approx_modes generic_approx_modes =
 {
@@ -612,7 +598,7 @@ static const struct tune_params cortexa35_tunings =
   &generic_addrcost_table,
   &cortexa53_regmove_cost,
   &generic_vector_cost,
-  &cortexa57_branch_cost,
+  &generic_branch_cost,
   &generic_approx_modes,
   4, /* memmov_cost  */
   1, /* issue_rate  */
@@ -638,7 +624,7 @@ static const struct tune_params cortexa53_tunings =
   &generic_addrcost_table,
   &cortexa53_regmove_cost,
   &generic_vector_cost,
-  &cortexa57_branch_cost,
+  &generic_branch_cost,
   &generic_approx_modes,
   4, /* memmov_cost  */
   2, /* issue_rate  */
@@ -664,7 +650,7 @@ static const struct tune_params cortexa57_tunings =
   &cortexa57_addrcost_table,
   &cortexa57_regmove_cost,
   &cortexa57_vector_cost,
-  &cortexa57_branch_cost,
+  &generic_branch_cost,
   &generic_approx_modes,
   4, /* memmov_cost  */
   3, /* issue_rate  */
@@ -690,7 +676,7 @@ static const struct tune_params cortexa72_tunings =
   &cortexa57_addrcost_table,
   &cortexa57_regmove_cost,
   &cortexa57_vector_cost,
-  &cortexa57_branch_cost,
+  &generic_branch_cost,
   &generic_approx_modes,
   4, /* memmov_cost  */
   3, /* issue_rate  */
@@ -716,7 +702,7 @@ static const struct tune_params cortexa73_tunings =
   &cortexa57_addrcost_table,
   &cortexa57_regmove_cost,
   &cortexa57_vector_cost,
-  &cortexa57_branch_cost,
+  &generic_branch_cost,
   &generic_approx_modes,
   4, /* memmov_cost.  */
   2, /* issue_rate.  */
@@ -871,7 +857,7 @@ static const struct tune_params thunderx2t99_tunings =
   &thunderx2t99_addrcost_table,
   &thunderx2t99_regmove_cost,
   &thunderx2t99_vector_cost,
-  &thunderx2t99_branch_cost,
+  &generic_branch_cost,
   &generic_approx_modes,
   4, /* memmov_cost.  */
   4, /* issue_rate.  */