[stubs] Port LoadIndexedStringStub to CSA

src/mips/code-stubs-mips.cc

Index: src/mips/code-stubs-mips.cc
diff --git a/src/mips/code-stubs-mips.cc b/src/mips/code-stubs-mips.cc
index 2ed3ffa8a4c5748d346660c521e3d16ce81124d8..1bed734cae1898667d3be7d7b283d070a7acf2e3 100644
--- a/src/mips/code-stubs-mips.cc
+++ b/src/mips/code-stubs-mips.cc
@@ -1277,35 +1277,6 @@ void JSEntryStub::Generate(MacroAssembler* masm) {
   __ Jump(ra);
 }
 
-
-void LoadIndexedStringStub::Generate(MacroAssembler* masm) {
-  // Return address is in ra.
-  Label miss;
-
-  Register receiver = LoadDescriptor::ReceiverRegister();
-  Register index = LoadDescriptor::NameRegister();
-  Register scratch = t1;
-  Register result = v0;
-  DCHECK(!scratch.is(receiver) && !scratch.is(index));
-  DCHECK(!scratch.is(LoadWithVectorDescriptor::VectorRegister()));
-
-  StringCharAtGenerator char_at_generator(receiver, index, scratch, result,
-                                          &miss,  // When not a string.
-                                          &miss,  // When not a number.
-                                          &miss,  // When index out of range.
-                                          RECEIVER_IS_STRING);
-  char_at_generator.GenerateFast(masm);
-  __ Ret();
-
-  StubRuntimeCallHelper call_helper;
-  char_at_generator.GenerateSlow(masm, PART_OF_IC_HANDLER, call_helper);
-
-  __ bind(&miss);
-  PropertyAccessCompiler::TailCallBuiltin(
-      masm, PropertyAccessCompiler::MissBuiltin(Code::KEYED_LOAD_IC));
-}
-
-
 void FunctionPrototypeStub::Generate(MacroAssembler* masm) {
   Label miss;
   Register receiver = LoadDescriptor::ReceiverRegister();
@@ -1990,51 +1961,6 @@ void StringCharCodeAtGenerator::GenerateSlow(
   __ Abort(kUnexpectedFallthroughFromCharCodeAtSlowCase);
 }
 
-
-// -------------------------------------------------------------------------
-// StringCharFromCodeGenerator
-
-void StringCharFromCodeGenerator::GenerateFast(MacroAssembler* masm) {
-  // Fast case of Heap::LookupSingleCharacterStringFromCode.
-
-  DCHECK(!t0.is(result_));
-  DCHECK(!t0.is(code_));
-
-  STATIC_ASSERT(kSmiTag == 0);
-  STATIC_ASSERT(kSmiShiftSize == 0);
-  DCHECK(base::bits::IsPowerOfTwo32(String::kMaxOneByteCharCodeU + 1));
-  __ And(t0, code_, Operand(kSmiTagMask |
-                            ((~String::kMaxOneByteCharCodeU) << kSmiTagSize)));
-  __ Branch(&slow_case_, ne, t0, Operand(zero_reg));
-
-  __ LoadRoot(result_, Heap::kSingleCharacterStringCacheRootIndex);
-  // At this point code register contains smi tagged one-byte char code.
-  STATIC_ASSERT(kSmiTag == 0);
-  __ Lsa(result_, result_, code_, kPointerSizeLog2 - kSmiTagSize);
-  __ lw(result_, FieldMemOperand(result_, FixedArray::kHeaderSize));
-  __ LoadRoot(t0, Heap::kUndefinedValueRootIndex);
-  __ Branch(&slow_case_, eq, result_, Operand(t0));
-  __ bind(&exit_);
-}
-
-
-void StringCharFromCodeGenerator::GenerateSlow(
-    MacroAssembler* masm,
-    const RuntimeCallHelper& call_helper) {
-  __ Abort(kUnexpectedFallthroughToCharFromCodeSlowCase);
-
-  __ bind(&slow_case_);
-  call_helper.BeforeCall(masm);
-  __ push(code_);
-  __ CallRuntime(Runtime::kStringCharFromCode);
-  __ Move(result_, v0);
-
-  call_helper.AfterCall(masm);
-  __ Branch(&exit_);
-
-  __ Abort(kUnexpectedFallthroughFromCharFromCodeSlowCase);
-}
-
 void StringHelper::GenerateFlatOneByteStringEquals(
     MacroAssembler* masm, Register left, Register right, Register scratch1,
     Register scratch2, Register scratch3) {