[turbofan] Add operators for float32 support.

src/runtime.cc

 // Copyright 2012 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 <stdlib.h>
 #include <limits>
 
 #include "src/v8.h"
 
 #include "src/accessors.h"
@@ skipping 7953 matching lines @@
   CONVERT_DOUBLE_ARG_CHECKED(x, 0);
   return *isolate->factory()->NewNumber(fast_sqrt(x));
 }
 
 
 RUNTIME_FUNCTION(Runtime_MathFround) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 1);
 
   CONVERT_DOUBLE_ARG_CHECKED(x, 0);
-  float xf = static_cast<float>(x);
+  float xf = DoubleToFloat32(x);
   return *isolate->factory()->NewNumber(xf);
 }
 
 
 RUNTIME_FUNCTION(Runtime_DateMakeDay) {
   SealHandleScope shs(isolate);
   DCHECK(args.length() == 2);
 
   CONVERT_SMI_ARG_CHECKED(year, 0);
   CONVERT_SMI_ARG_CHECKED(month, 1);
@@ skipping 7754 matching lines @@
   }
   return NULL;
 }
 
 
 const Runtime::Function* Runtime::FunctionForId(Runtime::FunctionId id) {
   return &(kIntrinsicFunctions[static_cast<int>(id)]);
 }
 
 } }  // namespace v8::internal