PPC64: Implemented the RoundUint64ToFloat64 TurboFan operator.

src/ppc/simulator-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 <stdarg.h>
 #include <stdlib.h>
 #include <cmath>
 
 #if V8_TARGET_ARCH_PPC
 
@@ skipping 2874 matching lines @@
     }
     case FCFID: {
       int frt = instr->RTValue();
       int frb = instr->RBValue();
       double t_val = get_double_from_d_register(frb);
       int64_t* frb_val_p = reinterpret_cast<int64_t*>(&t_val);
       double frt_val = static_cast<double>(*frb_val_p);
       set_d_register_from_double(frt, frt_val);
       return;
     }
+    case FCFIDU: {
+      int frt = instr->RTValue();
+      int frb = instr->RBValue();
+      double t_val = get_double_from_d_register(frb);
+      uint64_t* frb_val_p = reinterpret_cast<uint64_t*>(&t_val);
+      double frt_val = static_cast<double>(*frb_val_p);
+      set_d_register_from_double(frt, frt_val);
+      return;
+    }
     case FCTID: {
       int frt = instr->RTValue();
       int frb = instr->RBValue();
       double frb_val = get_double_from_d_register(frb);
       int64_t frt_val;
       int64_t one = 1;  // work-around gcc
       int64_t kMinLongLong = (one << 63);
       int64_t kMaxLongLong = kMinLongLong - 1;
 
       if (frb_val > kMaxLongLong) {
@@ skipping 1040 matching lines @@
   uintptr_t* stack_slot = reinterpret_cast<uintptr_t*>(current_sp);
   uintptr_t address = *stack_slot;
   set_register(sp, current_sp + sizeof(uintptr_t));
   return address;
 }
 }  // namespace internal
 }  // namespace v8
 
 #endif  // USE_SIMULATOR
 #endif  // V8_TARGET_ARCH_PPC