PPC: [turbofan] Added the RoundInt64ToFloat64 instruction to TurboFan.

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 646 matching lines @@
 
 void MacroAssembler::ConvertIntToFloat(const DoubleRegister dst,
                                        const Register src,
                                        const Register int_scratch) {
   MovIntToDouble(dst, src, int_scratch);
   fcfid(dst, dst);
   frsp(dst, dst);
 }
 
 
+#if V8_TARGET_ARCH_PPC64
+void MacroAssembler::ConvertInt64ToDouble(Register src,
+                                          DoubleRegister double_dst) {
+  MovInt64ToDouble(double_dst, src);
+  fcfid(double_dst, double_dst);
+}
+#endif
+
+
 void MacroAssembler::ConvertDoubleToInt64(const DoubleRegister double_input,
 #if !V8_TARGET_ARCH_PPC64
                                           const Register dst_hi,
 #endif
                                           const Register dst,
                                           const DoubleRegister double_dst,
                                           FPRoundingMode rounding_mode) {
   if (rounding_mode == kRoundToZero) {
     fctidz(double_dst, double_input);
   } else {
@@ skipping 3715 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