PPC: [turbofan] Implemented the TruncateFloat64ToUint64 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 1119 matching lines @@
     case kPPC_DoubleToInt32:
     case kPPC_DoubleToUint32:
     case kPPC_DoubleToInt64:
       __ ConvertDoubleToInt64(i.InputDoubleRegister(0),
 #if !V8_TARGET_ARCH_PPC64
                               kScratchReg,
 #endif
                               i.OutputRegister(), kScratchDoubleReg);
       DCHECK_EQ(LeaveRC, i.OutputRCBit());
       break;
+#if V8_TARGET_ARCH_PPC64
+    case kPPC_DoubleToUint64:
+      __ ConvertDoubleToUnsignedInt64(i.InputDoubleRegister(0),
+                                      i.OutputRegister(), kScratchDoubleReg);
+      DCHECK_EQ(LeaveRC, i.OutputRCBit());
+      break;
+#endif
     case kPPC_DoubleToFloat32:
       ASSEMBLE_FLOAT_UNOP_RC(frsp);
       break;
     case kPPC_Float32ToDouble:
       // Nothing to do.
       __ Move(i.OutputDoubleRegister(), i.InputDoubleRegister(0));
       DCHECK_EQ(LeaveRC, i.OutputRCBit());
       break;
     case kPPC_DoubleExtractLowWord32:
       __ MovDoubleLowToInt(i.OutputRegister(), i.InputDoubleRegister(0));
@@ skipping 585 matching lines @@
       padding_size -= v8::internal::Assembler::kInstrSize;
     }
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8