Implement tracking and optimizations of packed arrays

src/mips/lithium-codegen-mips.cc

Index: src/mips/lithium-codegen-mips.cc
diff --git a/src/mips/lithium-codegen-mips.cc b/src/mips/lithium-codegen-mips.cc
index 122fd1ef4c29aca625dcdda34e0e6ea7ffc72f5c..f4adfb78d655a5eecf95fe70aa7e6b9796fcd472 100644
--- a/src/mips/lithium-codegen-mips.cc
+++ b/src/mips/lithium-codegen-mips.cc
@@ -2453,6 +2453,8 @@ void LCodeGen::DoLoadElements(LLoadElements* instr) {
            Map::kElementsKindBitCount);
     __ Branch(&done, eq, scratch,
               Operand(FAST_ELEMENTS));
+    __ Branch(&done, eq, scratch,
+              Operand(FAST_HOLEY_ELEMENTS));
     __ Branch(&fail, lt, scratch,
               Operand(FIRST_EXTERNAL_ARRAY_ELEMENTS_KIND));
     __ Branch(&done, le, scratch,
@@ -3682,20 +3684,21 @@ void LCodeGen::DoTransitionElementsKind(LTransitionElementsKind* instr) {
   __ Branch(&not_applicable, ne, scratch, Operand(from_map));
 
   __ li(new_map_reg, Operand(to_map));
-  if (from_kind == FAST_SMI_ONLY_ELEMENTS && to_kind == FAST_ELEMENTS) {
+  if (IsFastSmiElementsKind(from_kind) && IsFastObjectElementsKind(to_kind)) {
     __ sw(new_map_reg, FieldMemOperand(object_reg, HeapObject::kMapOffset));
     // Write barrier.
     __ RecordWriteField(object_reg, HeapObject::kMapOffset, new_map_reg,
                         scratch, kRAHasBeenSaved, kDontSaveFPRegs);
-  } else if (from_kind == FAST_SMI_ONLY_ELEMENTS &&
-      to_kind == FAST_DOUBLE_ELEMENTS) {
+  } else if (IsFastSmiElementsKind(from_kind) &&
+             IsFastDoubleElementsKind(to_kind)) {
     Register fixed_object_reg = ToRegister(instr->temp_reg());
     ASSERT(fixed_object_reg.is(a2));
     ASSERT(new_map_reg.is(a3));
     __ mov(fixed_object_reg, object_reg);
     CallCode(isolate()->builtins()->TransitionElementsSmiToDouble(),
              RelocInfo::CODE_TARGET, instr);
-  } else if (from_kind == FAST_DOUBLE_ELEMENTS && to_kind == FAST_ELEMENTS) {
+  } else if (IsFastDoubleElementsKind(from_kind) &&
+             IsFastElementsKind(to_kind)) {
     Register fixed_object_reg = ToRegister(instr->temp_reg());
     ASSERT(fixed_object_reg.is(a2));
     ASSERT(new_map_reg.is(a3));
@@ -4450,8 +4453,8 @@ void LCodeGen::DoArrayLiteral(LArrayLiteral* instr) {
 
   // Deopt if the array literal boilerplate ElementsKind is of a type different
   // than the expected one. The check isn't necessary if the boilerplate has
-  // already been converted to FAST_ELEMENTS.
-  if (boilerplate_elements_kind != FAST_ELEMENTS) {
+  // already been converted to TERMINAL_FAST_ELEMENTS_KIND.
+  if (boilerplate_elements_kind != TERMINAL_FAST_ELEMENTS_KIND) {
     __ LoadHeapObject(a1, instr->hydrogen()->boilerplate_object());
     // Load map into a2.
     __ lw(a2, FieldMemOperand(a1, HeapObject::kMapOffset));