PPC: [compiler] Introduce code stubs for string relational comparisons.

src/ppc/code-stubs-ppc.cc

 // Copyright 2014 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_PPC
 
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
@@ skipping 2925 matching lines @@
   __ lbzx(scratch1, MemOperand(left, index));
   __ lbzx(r0, MemOperand(right, index));
   __ cmp(scratch1, r0);
   __ bne(chars_not_equal);
   __ addi(index, index, Operand(1));
   __ cmpi(index, Operand::Zero());
   __ bne(&loop);
 }
 
 
-void StringCompareStub::Generate(MacroAssembler* masm) {
-  // ----------- S t a t e -------------
-  //  -- r4    : left
-  //  -- r3    : right
-  //  -- lr    : return address
-  // -----------------------------------
-  __ AssertString(r4);
-  __ AssertString(r3);
-
-  Label not_same;
-  __ cmp(r3, r4);
-  __ bne(&not_same);
-  __ LoadSmiLiteral(r3, Smi::FromInt(EQUAL));
-  __ IncrementCounter(isolate()->counters()->string_compare_native(), 1, r4,
-                      r5);
-  __ Ret();
-
-  __ bind(&not_same);
-
-  // Check that both objects are sequential one-byte strings.
-  Label runtime;
-  __ JumpIfNotBothSequentialOneByteStrings(r4, r3, r5, r6, &runtime);
-
-  // Compare flat one-byte strings natively.
-  __ IncrementCounter(isolate()->counters()->string_compare_native(), 1, r5,
-                      r6);
-  StringHelper::GenerateCompareFlatOneByteStrings(masm, r4, r3, r5, r6, r7);
-
-  // Call the runtime; it returns -1 (less), 0 (equal), or 1 (greater)
-  // tagged as a small integer.
-  __ bind(&runtime);
-  __ Push(r4, r3);
-  __ TailCallRuntime(Runtime::kStringCompare);
-}
-
-
 void BinaryOpICWithAllocationSiteStub::Generate(MacroAssembler* masm) {
   // ----------- S t a t e -------------
   //  -- r4    : left
   //  -- r3    : right
   //  -- lr    : return address
   // -----------------------------------
 
   // Load r5 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 2878 matching lines @@
   CallApiFunctionAndReturn(masm, api_function_address, thunk_ref,
                            kStackUnwindSpace, NULL, return_value_operand, NULL);
 }
 
 
 #undef __
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_PPC