Implement inline string compare 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 8213 matching lines @@
     __ j(not_equal, &loop);
   }
   // Completed loop without finding different characters.
   // Compare lengths (precomputed).
   __ bind(&compare_lengths);
   __ testl(length_difference, length_difference);
   __ j(not_zero, &result_not_equal);
 
   // Result is EQUAL.
   __ Move(rax, Smi::FromInt(EQUAL));
-  __ IncrementCounter(&Counters::string_compare_native, 1);
   __ ret(2 * kPointerSize);
 
   Label result_greater;
   __ bind(&result_not_equal);
   // Unequal comparison of left to right, either character or length.
   __ j(greater, &result_greater);
 
   // Result is LESS.
   __ Move(rax, Smi::FromInt(LESS));
-  __ IncrementCounter(&Counters::string_compare_native, 1);
   __ ret(2 * kPointerSize);
 
   // Result is GREATER.
   __ bind(&result_greater);
   __ Move(rax, Smi::FromInt(GREATER));
-  __ IncrementCounter(&Counters::string_compare_native, 1);
   __ ret(2 * kPointerSize);
 }
 
 
 void StringCompareStub::Generate(MacroAssembler* masm) {
   Label runtime;
 
   // Stack frame on entry.
   //  rsp[0]: return address
   //  rsp[8]: right string
   //  rsp[16]: left string
 
   __ movq(rdx, Operand(rsp, 2 * kPointerSize));  // left
   __ movq(rax, Operand(rsp, 1 * kPointerSize));  // right
 
   // Check for identity.
   Label not_same;
   __ cmpq(rdx, rax);
   __ j(not_equal, &not_same);
   __ Move(rax, Smi::FromInt(EQUAL));
   __ IncrementCounter(&Counters::string_compare_native, 1);
   __ ret(2 * kPointerSize);
 
   __ bind(&not_same);
 
   // Check that both are sequential ASCII strings.
   __ JumpIfNotBothSequentialAsciiStrings(rdx, rax, rcx, rbx, &runtime);
 
   // Inline comparison of ascii strings.
+  __ IncrementCounter(&Counters::string_compare_native, 1);
   GenerateCompareFlatAsciiStrings(masm, rdx, rax, rcx, rbx, rdi, r8);
 
   // Call the runtime; it returns -1 (less), 0 (equal), or 1 (greater)
   // tagged as a small integer.
   __ bind(&runtime);
   __ TailCallRuntime(ExternalReference(Runtime::kStringCompare), 2, 1);
 }
 
 #undef __
 
@@ skipping 85 matching lines @@
   // Call the function from C++.
   return FUNCTION_CAST<ModuloFunction>(buffer);
 }
 
 #endif
 
 
 #undef __
 
 } }  // namespace v8::internal