[turbofan] Implemented the RoundUint64ToFloat32 TurboFan operator for x64, arm64,

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 653 matching lines @@
 
 
 #if V8_TARGET_ARCH_PPC64
 void MacroAssembler::ConvertInt64ToDouble(Register src,
                                           DoubleRegister double_dst) {
   MovInt64ToDouble(double_dst, src);
   fcfid(double_dst, double_dst);
 }
 
 
+void MacroAssembler::ConvertUnsignedInt64ToFloat(Register src,
+                                                 DoubleRegister double_dst) {
+  MovInt64ToDouble(double_dst, src);
+  fcfidus(double_dst, double_dst);
+}
+
+
 void MacroAssembler::ConvertUnsignedInt64ToDouble(Register src,
                                                   DoubleRegister double_dst) {
   MovInt64ToDouble(double_dst, src);
   fcfidu(double_dst, double_dst);
 }
 
 
 void MacroAssembler::ConvertInt64ToFloat(Register src,
                                          DoubleRegister double_dst) {
   MovInt64ToDouble(double_dst, src);
@@ skipping 3730 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