Use finite-length end-anchored regexps to reduce part of regexp that is searched.

src/regexp-macro-assembler-irregexp.cc

 // Copyright 2008-2009 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 127 matching lines @@
 
 
 void RegExpMacroAssemblerIrregexp::ReadStackPointerFromRegister(
     int register_index) {
   ASSERT(register_index >= 0);
   ASSERT(register_index <= kMaxRegister);
   Emit(BC_SET_SP_TO_REGISTER, register_index);
 }
 
 
+void RegExpMacroAssemblerIrregexp::SetCurrentPositionFromEnd(int by) {
+  ASSERT(is_uint24(by));
+  Emit(BC_SET_CURRENT_POSITION_FROM_END, by);
+}
+
+
 void RegExpMacroAssemblerIrregexp::SetRegister(int register_index, int to) {
   ASSERT(register_index >= 0);
   ASSERT(register_index <= kMaxRegister);
   Emit(BC_SET_REGISTER, register_index);
   Emit32(to);
 }
 
 
 void RegExpMacroAssemblerIrregexp::AdvanceRegister(int register_index, int by) {
   ASSERT(register_index >= 0);
@@ skipping 297 matching lines @@
   own_buffer_ = true;
   memcpy(buffer_.start(), old_buffer.start(), old_buffer.length());
   if (old_buffer_was_our_own) {
     old_buffer.Dispose();
   }
 }
 
 #endif  // V8_INTERPRETED_REGEXP
 
 } }  // namespace v8::internal