Harmony: implement Math.fround.

src/runtime.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 7811 matching lines @@
 RUNTIME_FUNCTION(MaybeObject*, Runtime_Math_sqrt) {
   SealHandleScope shs(isolate);
   ASSERT(args.length() == 1);
   isolate->counters()->math_sqrt()->Increment();
 
   CONVERT_DOUBLE_ARG_CHECKED(x, 0);
   return isolate->heap()->AllocateHeapNumber(fast_sqrt(x));
 }
 
 
+RUNTIME_FUNCTION(MaybeObject*, Runtime_Math_fround) {
+  SealHandleScope shs(isolate);
+  ASSERT(args.length() == 1);
+
+  CONVERT_DOUBLE_ARG_CHECKED(x, 0);
+  float xf = static_cast<float>(x);
+  return isolate->heap()->AllocateHeapNumber(xf);
+}
+
+
 RUNTIME_FUNCTION(MaybeObject*, Runtime_DateMakeDay) {
   SealHandleScope shs(isolate);
   ASSERT(args.length() == 2);
 
   CONVERT_SMI_ARG_CHECKED(year, 0);
   CONVERT_SMI_ARG_CHECKED(month, 1);
 
   return Smi::FromInt(isolate->date_cache()->DaysFromYearMonth(year, month));
 }
 
@@ skipping 7037 matching lines @@
     // Handle last resort GC and make sure to allow future allocations
     // to grow the heap without causing GCs (if possible).
     isolate->counters()->gc_last_resort_from_js()->Increment();
     isolate->heap()->CollectAllGarbage(Heap::kNoGCFlags,
                                        "Runtime::PerformGC");
   }
 }
 
 
 } }  // namespace v8::internal