PPC: [turbofan] Implemented the TruncateFloat64ToUint64 TurboFan operator.

src/ppc/macro-assembler-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 <assert.h>  // For assert
 #include <limits.h>  // For LONG_MIN, LONG_MAX.
 
 #if V8_TARGET_ARCH_PPC
 
 #include "src/base/bits.h"
@@ skipping 697 matching lines @@
     ResetRoundingMode();
   }
 
   MovDoubleToInt64(
 #if !V8_TARGET_ARCH_PPC64
       dst_hi,
 #endif
       dst, double_dst);
 }
 
+#if V8_TARGET_ARCH_PPC64
+void MacroAssembler::ConvertDoubleToUnsignedInt64(
+    const DoubleRegister double_input, const Register dst,
+    const DoubleRegister double_dst, FPRoundingMode rounding_mode) {
+  if (rounding_mode == kRoundToZero) {
+    fctiduz(double_dst, double_input);
+  } else {
+    SetRoundingMode(rounding_mode);
+    fctidu(double_dst, double_input);
+    ResetRoundingMode();
+  }
+
+  MovDoubleToInt64(dst, double_dst);
+}
+#endif
+
 
 void MacroAssembler::LoadConstantPoolPointerRegisterFromCodeTargetAddress(
     Register code_target_address) {
   lwz(kConstantPoolRegister,
       MemOperand(code_target_address,
                  Code::kConstantPoolOffset - Code::kHeaderSize));
   add(kConstantPoolRegister, kConstantPoolRegister, code_target_address);
 }
 
 
@@ skipping 3684 matching lines @@
   }
   if (mag.shift > 0) srawi(result, result, mag.shift);
   ExtractBit(r0, dividend, 31);
   add(result, result, r0);
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_PPC