Avoid a call to the runtime system when doing binary fp ops on ARM...

src/assembler.cc

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // 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.
 //
@@ skipping 564 matching lines @@
 }
 
 ExternalReference ExternalReference::new_space_allocation_limit_address() {
   return ExternalReference(Heap::NewSpaceAllocationLimitAddress());
 }
 
 ExternalReference ExternalReference::debug_step_in_fp_address() {
   return ExternalReference(Debug::step_in_fp_addr());
 }
 
+
+static double add_two_doubles(double x, double y) {
+  return x + y;
+}
+
+
+static double sub_two_doubles(double x, double y) {
+  return x - y;
+}
+
+
+static double mul_two_doubles(double x, double y) {
+  return x * y;
+}
+
+
+ExternalReference ExternalReference::double_fp_operation(
+    Token::Value operation) {
+  typedef double BinaryFPOperation(double x, double y);
+  BinaryFPOperation* function = NULL;
+  switch (operation) {
+    case Token::ADD:
+      function = &add_two_doubles;
+      break;
+    case Token::SUB:
+      function = &sub_two_doubles;
+      break;
+    case Token::MUL:
+      function = &mul_two_doubles;
+      break;
+    default:
+      UNREACHABLE();
+  }
+  return ExternalReference(FUNCTION_ADDR(function));
+}
+
 } }  // namespace v8::internal