Inline Math.fround in optimized code.

src/x64/lithium-codegen-x64.cc

 // Copyright 2013 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/v8.h"
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/code-stubs.h"
 #include "src/hydrogen-osr.h"
@@ skipping 3794 matching lines @@
     __ movq(output_reg, input_reg);
     __ testq(output_reg, output_reg);
     __ RecordComment("Minus zero");
     DeoptimizeIf(negative, instr->environment());
   }
   __ Set(output_reg, 0);
   __ bind(&done);
 }
 
 
+void LCodeGen::DoMathFround(LMathFround* instr) {
+  XMMRegister input_reg = ToDoubleRegister(instr->value());
+  XMMRegister output_reg = ToDoubleRegister(instr->result());
+  __ cvtsd2ss(output_reg, input_reg);
+  __ cvtss2sd(output_reg, output_reg);
+}
+
+
 void LCodeGen::DoMathSqrt(LMathSqrt* instr) {
   XMMRegister output = ToDoubleRegister(instr->result());
   if (instr->value()->IsDoubleRegister()) {
     XMMRegister input = ToDoubleRegister(instr->value());
     __ sqrtsd(output, input);
   } else {
     Operand input = ToOperand(instr->value());
     __ sqrtsd(output, input);
   }
 }
@@ skipping 2019 matching lines @@
   CallRuntime(Runtime::kPushBlockContext, 2, instr);
   RecordSafepoint(Safepoint::kNoLazyDeopt);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64