A64: Tidy up a couple of TODOs.

R=ulan@chromium.org

Review URL: https://codereview.chromium.org/189883006

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19809 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/a64/code-stubs-a64.cc

@@ -4941,8 +4941,7 @@ void StoreArrayLiteralElementStub::Generate(MacroAssembler* masm) {
 
 
 void StubFailureTrampolineStub::Generate(MacroAssembler* masm) {
-  // TODO(jbramley): The ARM code leaves the (shifted) offset in r1. Why?
-  CEntryStub ces(1, kSaveFPRegs);
+  CEntryStub ces(1, fp_registers_ ? kSaveFPRegs : kDontSaveFPRegs);
   __ Call(ces.GetCode(masm->isolate()), RelocInfo::CODE_TARGET);
   int parameter_count_offset =
       StubFailureTrampolineFrame::kCallerStackParameterCountFrameOffset;

src/a64/ic-a64.cc

@@ -474,12 +474,8 @@ void LoadIC::GenerateMiss(MacroAssembler* masm) {
 
   __ IncrementCounter(isolate->counters()->load_miss(), 1, x3, x4);
 
-  // TODO(jbramley): Does the target actually expect an argument in x3, or is
-  // this inherited from ARM's push semantics?
-  __ Mov(x3, x0);
-  __ Push(x3, x2);
-
   // Perform tail call to the entry.
+  __ Push(x0, x2);
   ExternalReference ref =
       ExternalReference(IC_Utility(kLoadIC_Miss), isolate);
   __ TailCallExternalReference(ref, 2, 1);
@@ -493,11 +489,7 @@ void LoadIC::GenerateRuntimeGetProperty(MacroAssembler* masm) {
   //  -- x0    : receiver
   // -----------------------------------
 
-  // TODO(jbramley): Does the target actually expect an argument in x3, or is
-  // this inherited from ARM's push semantics?
-  __ Mov(x3, x0);
-  __ Push(x3, x2);
-
+  __ Push(x0, x2);
   __ TailCallRuntime(Runtime::kGetProperty, 2, 1);
 }
 
@@ -985,8 +977,6 @@ static void KeyedStoreGenerateGenericHelper(
   // We have to go to the runtime if the current value is the hole because there
   // may be a callback on the element.
   Label holecheck_passed;
-  // TODO(all): This address calculation is repeated later (for the store
-  // itself). We should keep the result to avoid doing the work twice.
   __ Add(x10, elements, FixedArray::kHeaderSize - kHeapObjectTag);
   __ Add(x10, x10, Operand::UntagSmiAndScale(key, kPointerSizeLog2));
   __ Ldr(x11, MemOperand(x10));
@@ -1039,8 +1029,6 @@ static void KeyedStoreGenerateGenericHelper(
   // HOLECHECK: guards "A[i] double hole?"
   // We have to see if the double version of the hole is present. If so go to
   // the runtime.
-  // TODO(all): This address calculation was done earlier. We should keep the
-  // result to avoid doing the work twice.
   __ Add(x10, elements, FixedDoubleArray::kHeaderSize - kHeapObjectTag);
   __ Add(x10, x10, Operand::UntagSmiAndScale(key, kPointerSizeLog2));
   __ Ldr(x11, MemOperand(x10));

src/a64/macro-assembler-a64.cc

@@ -1516,12 +1516,7 @@ void MacroAssembler::AssertNotSmi(Register object, BailoutReason reason) {
 
 void MacroAssembler::AssertName(Register object) {
   if (emit_debug_code()) {
-    STATIC_ASSERT(kSmiTag == 0);
-    // TODO(jbramley): Add AbortIfSmi and related functions.
-    Label not_smi;
-    JumpIfNotSmi(object, &not_smi);
-    Abort(kOperandIsASmiAndNotAName);
-    Bind(&not_smi);
+    AssertNotSmi(object, kOperandIsASmiAndNotAName);
 
     UseScratchRegisterScope temps(this);
     Register temp = temps.AcquireX();
@@ -2847,8 +2842,6 @@ void MacroAssembler::Prologue(PrologueFrameMode frame_mode) {
     ASSERT(StackPointer().Is(jssp));
     UseScratchRegisterScope temps(this);
     Register temp = temps.AcquireX();
-    // TODO(jbramley): Does x1 contain a JSFunction here, or does it already
-    // have the special STUB smi?
     __ Mov(temp, Operand(Smi::FromInt(StackFrame::STUB)));
     // Compiled stubs don't age, and so they don't need the predictable code
     // ageing sequence.