[stubs] Refactor StringCompareStub and use it for HStringCompareAndBranch.

src/arm64/lithium-codegen-arm64.cc

 // Copyright 2013 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.
 
 #include "src/arm64/frames-arm64.h"
 #include "src/arm64/lithium-codegen-arm64.h"
 #include "src/arm64/lithium-gap-resolver-arm64.h"
 #include "src/base/bits.h"
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
@@ skipping 2080 matching lines @@
     case CodeStub::RegExpExec: {
       RegExpExecStub stub(isolate());
       CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
       break;
     }
     case CodeStub::SubString: {
       SubStringStub stub(isolate());
       CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
       break;
     }
-    case CodeStub::StringCompare: {
-      StringCompareStub stub(isolate());
-      CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
-      break;
-    }
     default:
       UNREACHABLE();
   }
   RecordPushedArgumentsDelta(instr->hydrogen()->argument_delta());
 }
 
 
 void LCodeGen::DoUnknownOSRValue(LUnknownOSRValue* instr) {
   GenerateOsrPrologue();
 }
@@ skipping 3380 matching lines @@
 
   PushSafepointRegistersScope scope(this);
   __ SmiTagAndPush(char_code);
   CallRuntimeFromDeferred(Runtime::kCharFromCode, 1, instr, instr->context());
   __ StoreToSafepointRegisterSlot(x0, result);
 }
 
 
 void LCodeGen::DoStringCompareAndBranch(LStringCompareAndBranch* instr) {
   DCHECK(ToRegister(instr->context()).is(cp));
-  Token::Value op = instr->op();
+  DCHECK(ToRegister(instr->left()).is(x1));
+  DCHECK(ToRegister(instr->right()).is(x0));
 
-  Handle<Code> ic =
-      CodeFactory::CompareIC(isolate(), op, Strength::WEAK).code();
-  CallCode(ic, RelocInfo::CODE_TARGET, instr);
-  InlineSmiCheckInfo::EmitNotInlined(masm());
+  Handle<Code> code = CodeFactory::StringCompare(isolate()).code();
+  CallCode(code, RelocInfo::CODE_TARGET, instr);
 
-  Condition condition = TokenToCondition(op, false);
-
-  EmitCompareAndBranch(instr, condition, x0, 0);
+  EmitCompareAndBranch(instr, TokenToCondition(instr->op(), false), x0, 0);
 }
 
 
 void LCodeGen::DoSubI(LSubI* instr) {
   bool can_overflow = instr->hydrogen()->CheckFlag(HValue::kCanOverflow);
   Register result = ToRegister32(instr->result());
   Register left = ToRegister32(instr->left());
   Operand right = ToShiftedRightOperand32(instr->right(), instr);
 
   if (can_overflow) {
@@ skipping 494 matching lines @@
   Handle<ScopeInfo> scope_info = instr->scope_info();
   __ Push(scope_info);
   __ Push(ToRegister(instr->function()));
   CallRuntime(Runtime::kPushBlockContext, 2, instr);
   RecordSafepoint(Safepoint::kNoLazyDeopt);
 }
 
 
 }  // namespace internal
 }  // namespace v8