Accelerate charCodeAt on ARM.

src/x64/codegen-x64.cc

 // Copyright 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 3727 matching lines @@
   __ movl(temp.reg(), FieldOperand(object.reg(), String::kLengthOffset));
   __ shrl_cl(temp.reg());
   // Check for index out of range.
   __ cmpl(index.reg(), temp.reg());
   __ j(greater_equal, &slow_case);
   // Reload the instance type (into the temp register this time)..
   __ movq(temp.reg(), FieldOperand(object.reg(), HeapObject::kMapOffset));
   __ movzxbl(temp.reg(), FieldOperand(temp.reg(), Map::kInstanceTypeOffset));
 
   // We need special handling for non-flat strings.
-  ASSERT(kSeqStringTag == 0);
+  ASSERT_EQ(0, kSeqStringTag);
   __ testb(temp.reg(), Immediate(kStringRepresentationMask));
   __ j(not_zero, &not_a_flat_string);
   // Check for 1-byte or 2-byte string.
+  ASSERT_EQ(0, kTwoByteStringTag);
   __ testb(temp.reg(), Immediate(kStringEncodingMask));
   __ j(not_zero, &ascii_string);
 
   // 2-byte string.
   // Load the 2-byte character code into the temp register.
   __ movzxwl(temp.reg(), FieldOperand(object.reg(),
                                       index.reg(),
                                       times_2,
                                       SeqTwoByteString::kHeaderSize));
   __ jmp(&got_char_code);
@@ skipping 4081 matching lines @@
   masm.GetCode(&desc);
   // Call the function from C++.
   return FUNCTION_CAST<ModuloFunction>(buffer);
 }
 
 #endif
 
 #undef __
 
 } }  // namespace v8::internal