[AArch64][2/2] Add rtx cost function handling of clz, clrsb, rbit.

	* config/aarch64/aarch64.c (aarch64_rtx_costs): Handle CLRSB, CLZ.
	(case UNSPEC): Handle UNSPEC_RBIT.

From-SVN: r212913

gcc/ChangeLog

 2014-07-22  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
 
+	* config/aarch64/aarch64.c (aarch64_rtx_costs): Handle CLRSB, CLZ.
+	(case UNSPEC): Handle UNSPEC_RBIT.
+
+2014-07-22  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
+
 	* config/aarch64/aarch64.md: Delete UNSPEC_CLS.
 	(clrsb<mode>2): Use clrsb RTL code instead of UNSPEC_CLS.
 

gcc/config/aarch64/aarch64.c

@@ -5151,6 +5151,13 @@ aarch64_rtx_costs (rtx x, int code, int outer ATTRIBUTE_UNUSED,
 
       return false;
 
+    case CLRSB:
+    case CLZ:
+      if (speed)
+        *cost += extra_cost->alu.clz;
+
+      return false;
+
     case COMPARE:
       op0 = XEXP (x, 0);
       op1 = XEXP (x, 1);
@@ -5796,6 +5803,14 @@ cost_plus:
 
           return false;
         }
+
+      if (XINT (x, 1) == UNSPEC_RBIT)
+        {
+          if (speed)
+            *cost += extra_cost->alu.rev;
+
+          return false;
+        }
       break;
 
     case TRUNCATE: