[AArch64] Add handling of bswap operations in rtx costs

	* config/aarch64/aarch64.c (aarch64_rtx_costs): Handle BSWAP.

From-SVN: r209706

gcc/ChangeLog

 2014-04-23  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
 
+	* config/aarch64/aarch64.c (aarch64_rtx_costs): Handle BSWAP.
+
+2014-04-23  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
+
 	* config/arm/arm.md (arm_rev16si2): New pattern.
 	(arm_rev16si2_alt): Likewise.
 	* config/arm/arm.c (arm_new_rtx_costs): Handle rev16 case.

gcc/config/aarch64/aarch64.c

@@ -4694,6 +4694,14 @@ aarch64_rtx_costs (rtx x, int code, int outer ATTRIBUTE_UNUSED,
 
       return false;
 
+    case BSWAP:
+      *cost = COSTS_N_INSNS (1);
+
+      if (speed)
+        *cost += extra_cost->alu.rev;
+
+      return false;
+
     case IOR:
       if (aarch_rev16_p (x))
         {