Implement tracking and optimizations of packed arrays

src/x64/stub-cache-x64.cc

Index: src/x64/stub-cache-x64.cc
diff --git a/src/x64/stub-cache-x64.cc b/src/x64/stub-cache-x64.cc
index 5721e9b373169180d64ce58f5734d5099d6274c6..1b8ed3848c2ff1aeb13e5f2c5286b367e2c47ac7 100644
--- a/src/x64/stub-cache-x64.cc
+++ b/src/x64/stub-cache-x64.cc
@@ -1434,17 +1434,32 @@ Handle<Code> CallStubCompiler::CompileArrayPushCall(
         __ jmp(&fast_object);
         // In case of fast smi-only, convert to fast object, otherwise bail out.
         __ bind(&not_fast_object);
-        __ CheckFastSmiOnlyElements(rbx, &call_builtin);
+        __ CheckFastSmiElements(rbx, &call_builtin);
         // rdx: receiver
         // rbx: map
-        __ movq(r9, rdi);  // Backup rdi as it is going to be trashed.
-        __ LoadTransitionedArrayMapConditional(FAST_SMI_ONLY_ELEMENTS,
+
+        Label try_holey_map;
+        __ LoadTransitionedArrayMapConditional(FAST_SMI_ELEMENTS,
                                                FAST_ELEMENTS,
                                                rbx,
                                                rdi,
+                                               &try_holey_map);
+
+        ElementsTransitionGenerator::
+            GenerateMapChangeElementsTransition(masm());
+        // Restore edi.
+        __ movq(rdi, FieldOperand(rdx, JSArray::kElementsOffset));
+        __ jmp(&fast_object);
+
+        __ bind(&try_holey_map);
+        __ LoadTransitionedArrayMapConditional(FAST_HOLEY_SMI_ELEMENTS,
+                                               FAST_HOLEY_ELEMENTS,
+                                               rbx,
+                                               rdi,
                                                &call_builtin);
-        ElementsTransitionGenerator::GenerateSmiOnlyToObject(masm());
-        __ movq(rdi, r9);
+        ElementsTransitionGenerator::
+            GenerateMapChangeElementsTransition(masm());
+        __ movq(rdi, FieldOperand(rdx, JSArray::kElementsOffset));
         __ bind(&fast_object);
       } else {
         __ CheckFastObjectElements(rbx, &call_builtin);
@@ -3369,8 +3384,11 @@ void KeyedStoreStubCompiler::GenerateStoreExternalArray(
       __ movsd(Operand(rbx, rdi, times_8, 0), xmm0);
       break;
     case FAST_ELEMENTS:
-    case FAST_SMI_ONLY_ELEMENTS:
+    case FAST_SMI_ELEMENTS:
     case FAST_DOUBLE_ELEMENTS:
+    case FAST_HOLEY_ELEMENTS:
+    case FAST_HOLEY_SMI_ELEMENTS:
+    case FAST_HOLEY_DOUBLE_ELEMENTS:
     case DICTIONARY_ELEMENTS:
     case NON_STRICT_ARGUMENTS_ELEMENTS:
       UNREACHABLE();
@@ -3435,8 +3453,11 @@ void KeyedStoreStubCompiler::GenerateStoreExternalArray(
         case EXTERNAL_FLOAT_ELEMENTS:
         case EXTERNAL_DOUBLE_ELEMENTS:
         case FAST_ELEMENTS:
-        case FAST_SMI_ONLY_ELEMENTS:
+        case FAST_SMI_ELEMENTS:
         case FAST_DOUBLE_ELEMENTS:
+        case FAST_HOLEY_ELEMENTS:
+        case FAST_HOLEY_SMI_ELEMENTS:
+        case FAST_HOLEY_DOUBLE_ELEMENTS:
         case DICTIONARY_ELEMENTS:
         case NON_STRICT_ARGUMENTS_ELEMENTS:
           UNREACHABLE();
@@ -3587,7 +3608,7 @@ void KeyedStoreStubCompiler::GenerateStoreFastElement(
   // Check that the key is a smi or a heap number convertible to a smi.
   GenerateSmiKeyCheck(masm, rcx, rbx, xmm0, xmm1, &miss_force_generic);
 
-  if (elements_kind == FAST_SMI_ONLY_ELEMENTS) {
+  if (IsFastSmiElementsKind(elements_kind)) {
     __ JumpIfNotSmi(rax, &transition_elements_kind);
   }
 
@@ -3611,13 +3632,13 @@ void KeyedStoreStubCompiler::GenerateStoreFastElement(
   __ j(not_equal, &miss_force_generic);
 
   __ bind(&finish_store);
-  if (elements_kind == FAST_SMI_ONLY_ELEMENTS) {
+  if (IsFastSmiElementsKind(elements_kind)) {
     __ SmiToInteger32(rcx, rcx);
     __ movq(FieldOperand(rdi, rcx, times_pointer_size, FixedArray::kHeaderSize),
             rax);
   } else {
     // Do the store and update the write barrier.
-    ASSERT(elements_kind == FAST_ELEMENTS);
+    ASSERT(IsFastObjectElementsKind(elements_kind));
     __ SmiToInteger32(rcx, rcx);
     __ lea(rcx,
            FieldOperand(rdi, rcx, times_pointer_size, FixedArray::kHeaderSize));