[compiler] Introduce code stubs for string relational comparisons.

src/ia32/code-stubs-ia32.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if V8_TARGET_ARCH_IA32
 
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
@@ skipping 2846 matching lines @@
   Label loop;
   __ bind(&loop);
   __ mov_b(scratch, Operand(left, index, times_1, 0));
   __ cmpb(scratch, Operand(right, index, times_1, 0));
   __ j(not_equal, chars_not_equal, chars_not_equal_near);
   __ inc(index);
   __ j(not_zero, &loop);
 }
 
 
-void StringCompareStub::Generate(MacroAssembler* masm) {
-  // ----------- S t a t e -------------
-  //  -- edx    : left string
-  //  -- eax    : right string
-  //  -- esp[0] : return address
-  // -----------------------------------
-  __ AssertString(edx);
-  __ AssertString(eax);
-
-  Label not_same;
-  __ cmp(edx, eax);
-  __ j(not_equal, &not_same, Label::kNear);
-  __ Move(eax, Immediate(Smi::FromInt(EQUAL)));
-  __ IncrementCounter(isolate()->counters()->string_compare_native(), 1);
-  __ Ret();
-
-  __ bind(&not_same);
-
-  // Check that both objects are sequential one-byte strings.
-  Label runtime;
-  __ JumpIfNotBothSequentialOneByteStrings(edx, eax, ecx, ebx, &runtime);
-
-  // Compare flat one-byte strings.
-  __ IncrementCounter(isolate()->counters()->string_compare_native(), 1);
-  StringHelper::GenerateCompareFlatOneByteStrings(masm, edx, eax, ecx, ebx,
-                                                  edi);
-
-  // Call the runtime; it returns -1 (less), 0 (equal), or 1 (greater)
-  // tagged as a small integer.
-  __ bind(&runtime);
-  __ PopReturnAddressTo(ecx);
-  __ Push(edx);
-  __ Push(eax);
-  __ PushReturnAddressFrom(ecx);
-  __ TailCallRuntime(Runtime::kStringCompare);
-}
-
-
 void BinaryOpICWithAllocationSiteStub::Generate(MacroAssembler* masm) {
   // ----------- S t a t e -------------
   //  -- edx    : left
   //  -- eax    : right
   //  -- esp[0] : return address
   // -----------------------------------
 
   // Load ecx with the allocation site.  We stick an undefined dummy value here
   // and replace it with the real allocation site later when we instantiate this
   // stub in BinaryOpICWithAllocationSiteStub::GetCodeCopyFromTemplate().
@@ skipping 3014 matching lines @@
                            return_value_operand, NULL);
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_IA32