Add binary-op stub variant to handle oddball objects more efficiently.

src/x64/code-stubs-x64.cc

Index: src/x64/code-stubs-x64.cc
===================================================================
--- src/x64/code-stubs-x64.cc	(revision 7379)
+++ src/x64/code-stubs-x64.cc	(working copy)
@@ -1062,6 +1062,9 @@
     case TRBinaryOpIC::HEAP_NUMBER:
       GenerateHeapNumberStub(masm);
       break;
+    case TRBinaryOpIC::ODDBALL:
+      GenerateOddballStub(masm);
+      break;
     case TRBinaryOpIC::STRING:
       GenerateStringStub(masm);
       break;
@@ -1438,6 +1441,39 @@
 }
 
 
+void TypeRecordingBinaryOpStub::GenerateOddballStub(MacroAssembler* masm) {
+  Label call_runtime;
+
+  if (op_ == Token::ADD) {
+    // Handle string addition here, because it is the only operation
+    // that does not do a ToNumber conversion on the operands.
+    GenerateStringAddCode(masm);
+  }
+
+  // Convert odd ball arguments to numbers.
+  NearLabel check, done;
+  __ Cmp(rdx, FACTORY->undefined_value());

[Erik Corry, 2011/03/28 15:15:24]

CompareRoot and LoadRoot.

[fschneider, 2011/03/28 16:28:59]

Done.

+  __ j(not_equal, &check);
+  if (Token::IsBitOp(op_)) {
+    __ xor_(rdx, rdx);
+  } else {
+    __ Move(rdx, FACTORY->nan_value());
+  }
+  __ jmp(&done);
+  __ bind(&check);
+  __ Cmp(rax, FACTORY->undefined_value());
+  __ j(not_equal, &done);
+  if (Token::IsBitOp(op_)) {
+    __ xor_(rax, rax);
+  } else {
+    __ Move(rax, FACTORY->nan_value());
+  }
+  __ bind(&done);
+
+  GenerateHeapNumberStub(masm);
+}
+
+
 void TypeRecordingBinaryOpStub::GenerateHeapNumberStub(MacroAssembler* masm) {
   Label gc_required, not_number;
   GenerateFloatingPointCode(masm, &gc_required, &not_number);