[compiler] Introduce code stubs for string relational comparisons.

src/mips/code-stubs-mips.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_MIPS
 
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
@@ skipping 2985 matching lines @@
   __ Addu(scratch3, left, index);
   __ lbu(scratch1, MemOperand(scratch3));
   __ Addu(scratch3, right, index);
   __ lbu(scratch2, MemOperand(scratch3));
   __ Branch(chars_not_equal, ne, scratch1, Operand(scratch2));
   __ Addu(index, index, 1);
   __ Branch(&loop, ne, index, Operand(zero_reg));
 }
 
 
-void StringCompareStub::Generate(MacroAssembler* masm) {
-  // ----------- S t a t e -------------
-  //  -- a1    : left
-  //  -- a0    : right
-  //  -- ra    : return address
-  // -----------------------------------
-  __ AssertString(a1);
-  __ AssertString(a0);
-
-  Label not_same;
-  __ Branch(&not_same, ne, a0, Operand(a1));
-  __ li(v0, Operand(Smi::FromInt(EQUAL)));
-  __ IncrementCounter(isolate()->counters()->string_compare_native(), 1, a1,
-                      a2);
-  __ Ret();
-
-  __ bind(&not_same);
-
-  // Check that both objects are sequential one-byte strings.
-  Label runtime;
-  __ JumpIfNotBothSequentialOneByteStrings(a1, a0, a2, a3, &runtime);
-
-  // Compare flat ASCII strings natively.
-  __ IncrementCounter(isolate()->counters()->string_compare_native(), 1, a2,
-                      a3);
-  StringHelper::GenerateCompareFlatOneByteStrings(masm, a1, a0, a2, a3, t0, t1);
-
-  __ bind(&runtime);
-  __ Push(a1, a0);
-  __ TailCallRuntime(Runtime::kStringCompare);
-}
-
-
 void BinaryOpICWithAllocationSiteStub::Generate(MacroAssembler* masm) {
   // ----------- S t a t e -------------
   //  -- a1    : left
   //  -- a0    : right
   //  -- ra    : return address
   // -----------------------------------
 
   // Load a2 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 2753 matching lines @@
                            return_value_operand, NULL);
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS