PPC64: Implemented the Word64Clz TurboFan operator.

src/compiler/ppc/code-generator-ppc.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/code-generator.h"
 
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/osr.h"
@@ skipping 926 matching lines @@
     case kPPC_RoundDouble:
       ASSEMBLE_FLOAT_UNOP_RC(frin);
       break;
     case kPPC_NegDouble:
       ASSEMBLE_FLOAT_UNOP_RC(fneg);
       break;
     case kPPC_Cntlz32:
       __ cntlzw_(i.OutputRegister(), i.InputRegister(0));
       DCHECK_EQ(LeaveRC, i.OutputRCBit());
       break;
+#if V8_TARGET_ARCH_PPC64
+    case kPPC_Cntlz64:
+      __ cntlzd_(i.OutputRegister(), i.InputRegister(0));
+      DCHECK_EQ(LeaveRC, i.OutputRCBit());
+      break;
+#endif
     case kPPC_Popcnt32:
       __ popcntw(i.OutputRegister(), i.InputRegister(0));
       DCHECK_EQ(LeaveRC, i.OutputRCBit());
       break;
     case kPPC_Cmp32:
       ASSEMBLE_COMPARE(cmpw, cmplw);
       break;
 #if V8_TARGET_ARCH_PPC64
     case kPPC_Cmp64:
       ASSEMBLE_COMPARE(cmp, cmpl);
@@ skipping 695 matching lines @@
       padding_size -= v8::internal::Assembler::kInstrSize;
     }
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8