[turbofan] Added the optional Float64RoundTiesEven operator to turbofan.

src/compiler/mips64/code-generator-mips64.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"
 #include "src/mips/macro-assembler-mips.h"
@@ skipping 195 matching lines @@
 };
 
 
 class OutOfLineCeil final : public OutOfLineRound {
  public:
   OutOfLineCeil(CodeGenerator* gen, DoubleRegister result)
       : OutOfLineRound(gen, result) {}
 };
 
 
+class OutOfLineTiesEven final : public OutOfLineRound {
+ public:
+  OutOfLineTiesEven(CodeGenerator* gen, DoubleRegister result)
+      : OutOfLineRound(gen, result) {}
+};
+
+
 class OutOfLineRecordWrite final : public OutOfLineCode {
  public:
   OutOfLineRecordWrite(CodeGenerator* gen, Register object, Register index,
                        Register value, Register scratch0, Register scratch1,
                        RecordWriteMode mode)
       : OutOfLineCode(gen),
         object_(object),
         index_(index),
         value_(value),
         scratch0_(scratch0),
@@ skipping 628 matching lines @@
       break;
     }
     case kMips64Float64RoundTruncate: {
       ASSEMBLE_ROUND_DOUBLE_TO_DOUBLE(trunc_l_d, Truncate);
       break;
     }
     case kMips64Float64RoundUp: {
       ASSEMBLE_ROUND_DOUBLE_TO_DOUBLE(ceil_l_d, Ceil);
       break;
     }
+    case kMips64Float64RoundTiesEven: {
+      ASSEMBLE_ROUND_DOUBLE_TO_DOUBLE(round_l_d, TiesEven);
+      break;
+    }
     case kMips64Float64Max: {
       // (b < a) ? a : b
       if (kArchVariant == kMips64r6) {
         __ cmp_d(OLT, i.OutputDoubleRegister(), i.InputDoubleRegister(1),
                  i.InputDoubleRegister(0));
         __ sel_d(i.OutputDoubleRegister(), i.InputDoubleRegister(1),
                  i.InputDoubleRegister(0));
       } else {
         __ c_d(OLT, i.InputDoubleRegister(0), i.InputDoubleRegister(1));
         // Left operand is result, passthrough if false.
@@ skipping 803 matching lines @@
       padding_size -= v8::internal::Assembler::kInstrSize;
     }
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8