Version 3.2.6

src/mips/register-allocator-mips-inl.h

 // Copyright 2010 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 107 matching lines @@
     sp,
     s8_fp,
     ra
   };
   return kRegisters[num];
 }
 
 
 void RegisterAllocator::Initialize() {
   Reset();
-  // The non-reserved a1 and ra registers are live on JS function entry.
-  Use(a1);  // JS function.
-  Use(ra);  // Return address.
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_IA32_REGISTER_ALLOCATOR_MIPS_INL_H_