Implement trigonometric functions using a fdlibm port.

src/runtime.cc

Index: src/runtime.cc
diff --git a/src/runtime.cc b/src/runtime.cc
index 55db916751f3c3e8e18f263f5976752c82562811..52a7d0d0b698ea745a9eafb6dea52db7d6b73d47 100644
--- a/src/runtime.cc
+++ b/src/runtime.cc
@@ -45,6 +45,7 @@
 #include "src/utils.h"
 #include "src/v8threads.h"
 #include "src/vm-state-inl.h"
+#include "third_party/fdlibm/fdlibm.h"
 
 #ifdef V8_I18N_SUPPORT
 #include "src/i18n.h"
@@ -7676,6 +7677,21 @@ RUNTIME_FUNCTION(Runtime_ConstructDouble) {
 }
 
 
+RUNTIME_FUNCTION(Runtime_RemPiO2) {
+  HandleScope handle_scope(isolate);
+  DCHECK(args.length() == 1);
+  CONVERT_DOUBLE_ARG_CHECKED(x, 0);
+  Factory* factory = isolate->factory();
+  double y[2];
+  int n = rempio2(x, y);
+  Handle<FixedArray> array = factory->NewFixedArray(3);
+  array->set(0, Smi::FromInt(n));
+  array->set(1, *factory->NewHeapNumber(y[0]));
+  array->set(2, *factory->NewHeapNumber(y[1]));
+  return *factory->NewJSArrayWithElements(array);
+}
+
+
 static const double kPiDividedBy4 = 0.78539816339744830962;