CTZ instruction implemented as optional operator.

src/compiler/instruction-selector.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/instruction-selector.h"
 
 #include <limits>
 
 #include "src/base/adapters.h"
 #include "src/compiler/instruction-selector-impl.h"
@@ skipping 593 matching lines @@
     case IrOpcode::kWord32Shr:
       return MarkAsWord32(node), VisitWord32Shr(node);
     case IrOpcode::kWord32Sar:
       return MarkAsWord32(node), VisitWord32Sar(node);
     case IrOpcode::kWord32Ror:
       return MarkAsWord32(node), VisitWord32Ror(node);
     case IrOpcode::kWord32Equal:
       return VisitWord32Equal(node);
     case IrOpcode::kWord32Clz:
       return MarkAsWord32(node), VisitWord32Clz(node);
+    case IrOpcode::kWord32Ctz:
+      return MarkAsWord32(node), VisitWord32Ctz(node);
     case IrOpcode::kWord64And:
       return MarkAsWord64(node), VisitWord64And(node);
     case IrOpcode::kWord64Or:
       return MarkAsWord64(node), VisitWord64Or(node);
     case IrOpcode::kWord64Xor:
       return MarkAsWord64(node), VisitWord64Xor(node);
     case IrOpcode::kWord64Shl:
       return MarkAsWord64(node), VisitWord64Shl(node);
     case IrOpcode::kWord64Shr:
       return MarkAsWord64(node), VisitWord64Shr(node);
@@ skipping 524 matching lines @@
   for (StateValuesAccess::TypedNode input_node : StateValuesAccess(stack)) {
     inputs->push_back(OperandForDeopt(&g, input_node.node, kind));
     descriptor->SetType(value_index++, input_node.type);
   }
   DCHECK(value_index == descriptor->GetSize());
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8