Experimental: handle single-entry basic blocks as a special case....

src/codegen-ia32.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 420 matching lines @@
   // is optimal compared to the default code generated for a switch statement
   // on that platform.
   int FastCaseSwitchMinCaseCount();
 
   // Allocate a jump table and create code to jump through it.
   // Should call GenerateFastCaseSwitchCases to generate the code for
   // all the cases at the appropriate point.
   void GenerateFastCaseSwitchJumpTable(SwitchStatement* node,
                                        int min_index,
                                        int range,
-                                       JumpTarget* fail_label,
-                                       Vector<JumpTarget*> case_targets,
-                                       Vector<JumpTarget> case_labels);
+                                       Label* fail_label,
+                                       Vector<Label*> case_targets,
+                                       Vector<Label> case_labels);
 
   // Generate the code for cases for the fast case switch.
   // Called by GenerateFastCaseSwitchJumpTable.
   void GenerateFastCaseSwitchCases(SwitchStatement* node,
-                                   Vector<JumpTarget> case_labels,
-                                   JumpTarget* table_start);
+                                   Vector<Label> case_labels,
+                                   VirtualFrame* start_frame);
 
   // Fast support for constant-Smi switches.
   void GenerateFastCaseSwitchStatement(SwitchStatement* node,
                                        int min_index,
                                        int range,
                                        int default_index);
 
   // Fast support for constant-Smi switches. Tests whether switch statement
   // permits optimization and calls GenerateFastCaseSwitch if it does.
   // Returns true if the fast-case switch was generated, and false if not.
@@ skipping 56 matching lines @@
   cgen_->set_in_spilled_code(false);
   GetValue(typeof_state);
   cgen_->frame()->SpillAll();
   cgen_->set_in_spilled_code(true);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_CODEGEN_IA32_H_