Re-apply "Inline floating point compare"...

src/codegen.h

 // Copyright 2006-2008 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 328 matching lines @@
 enum NaNInformation {
   kBothCouldBeNaN,
   kCantBothBeNaN
 };
 
 
 class CompareStub: public CodeStub {
  public:
   CompareStub(Condition cc,
               bool strict,
-              NaNInformation nan_info = kBothCouldBeNaN) :
-      cc_(cc), strict_(strict), never_nan_nan_(nan_info == kCantBothBeNaN) { }
+              NaNInformation nan_info = kBothCouldBeNaN,
+              bool include_number_compare = true) :
+      cc_(cc),
+      strict_(strict),
+      never_nan_nan_(nan_info == kCantBothBeNaN),
+      include_number_compare_(include_number_compare),
+      name_(NULL) { }
 
   void Generate(MacroAssembler* masm);
 
  private:
   Condition cc_;
   bool strict_;
   // Only used for 'equal' comparisons.  Tells the stub that we already know
   // that at least one side of the comparison is not NaN.  This allows the
   // stub to use object identity in the positive case.  We ignore it when
   // generating the minor key for other comparisons to avoid creating more
   // stubs.
   bool never_nan_nan_;
+  // Do generate the number comparison code in the stub. Stubs without number
+  // comparison code is used when the number comparison has been inlined, and
+  // the stub will be called if one of the operands is not a number.
+  bool include_number_compare_;
 
   // Encoding of the minor key CCCCCCCCCCCCCCNS.
   class StrictField: public BitField<bool, 0, 1> {};
   class NeverNanNanField: public BitField<bool, 1, 1> {};
-  class ConditionField: public BitField<int, 2, 14> {};
+  class IncludeNumberCompareField: public BitField<bool, 2, 1> {};
+  class ConditionField: public BitField<int, 3, 13> {};
 
   Major MajorKey() { return Compare; }
 
   int MinorKey();
 
   // Branch to the label if the given object isn't a symbol.
   void BranchIfNonSymbol(MacroAssembler* masm,
                          Label* label,
                          Register object,
                          Register scratch);
 
   // Unfortunately you have to run without snapshots to see most of these
   // names in the profile since most compare stubs end up in the snapshot.
+  char* name_;
   const char* GetName();
 #ifdef DEBUG
   void Print() {
-    PrintF("CompareStub (cc %d), (strict %s)\n",
+    PrintF("CompareStub (cc %d), (strict %s), "
+           "(never_nan_nan %s), (number_compare %s)\n",
            static_cast<int>(cc_),
-           strict_ ? "true" : "false");
+           strict_ ? "true" : "false",
+           never_nan_nan_ ? "true" : "false",
+           include_number_compare_ ? "included" : "not included");
   }
 #endif
 };
 
 
 class CEntryStub : public CodeStub {
  public:
   explicit CEntryStub(int result_size,
                       ExitFrame::Mode mode = ExitFrame::MODE_NORMAL)
       : result_size_(result_size), mode_(mode) { }
@@ skipping 190 matching lines @@
  private:
   Major MajorKey() { return ToBoolean; }
   int MinorKey() { return 0; }
 };
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CODEGEN_H_