Implement tracking and optimizations of packed arrays

src/ia32/code-stubs-ia32.cc

Index: src/ia32/code-stubs-ia32.cc
diff --git a/src/ia32/code-stubs-ia32.cc b/src/ia32/code-stubs-ia32.cc
index a1c6edd0fab30080f0c6d2480ccfd33281b386c7..c6ee5616e2fb0cef3911d72798179fb93cd09756 100644
--- a/src/ia32/code-stubs-ia32.cc
+++ b/src/ia32/code-stubs-ia32.cc
@@ -7057,8 +7057,8 @@ static const AheadOfTimeWriteBarrierStubList kAheadOfTime[] = {
   // KeyedStoreStubCompiler::GenerateStoreFastElement.
   { REG(edi), REG(ebx), REG(ecx), EMIT_REMEMBERED_SET},
   { REG(edx), REG(edi), REG(ebx), EMIT_REMEMBERED_SET},
-  // ElementsTransitionGenerator::GenerateSmiOnlyToObject
-  // and ElementsTransitionGenerator::GenerateSmiOnlyToDouble
+  // ElementsTransitionGenerator::GenerateMapChangeElementTransition
+  // and ElementsTransitionGenerator::GenerateSmiToDouble
   // and ElementsTransitionGenerator::GenerateDoubleToObject
   { REG(edx), REG(ebx), REG(edi), EMIT_REMEMBERED_SET},
   { REG(edx), REG(ebx), REG(edi), OMIT_REMEMBERED_SET},
@@ -7330,9 +7330,9 @@ void StoreArrayLiteralElementStub::Generate(MacroAssembler* masm) {
 
   __ CheckFastElements(edi, &double_elements);
 
-  // FAST_SMI_ONLY_ELEMENTS or FAST_ELEMENTS
+  // Check for FAST_*_SMI_ELEMENTS or FAST_*_ELEMENTS elements
   __ JumpIfSmi(eax, &smi_element);
-  __ CheckFastSmiOnlyElements(edi, &fast_elements, Label::kNear);
+  __ CheckFastSmiElements(edi, &fast_elements, Label::kNear);
 
   // Store into the array literal requires a elements transition. Call into
   // the runtime.
@@ -7354,7 +7354,7 @@ void StoreArrayLiteralElementStub::Generate(MacroAssembler* masm) {
   __ pop(edx);
   __ jmp(&slow_elements);
 
-  // Array literal has ElementsKind of FAST_ELEMENTS and value is an object.
+  // Array literal has ElementsKind of FAST_*_ELEMENTS and value is an object.
   __ bind(&fast_elements);
   __ mov(ebx, FieldOperand(ebx, JSObject::kElementsOffset));
   __ lea(ecx, FieldOperand(ebx, ecx, times_half_pointer_size,
@@ -7367,15 +7367,15 @@ void StoreArrayLiteralElementStub::Generate(MacroAssembler* masm) {
                  OMIT_SMI_CHECK);
   __ ret(0);
 
-  // Array literal has ElementsKind of FAST_SMI_ONLY_ELEMENTS or
-  // FAST_ELEMENTS, and value is Smi.
+  // Array literal has ElementsKind of FAST_*_SMI_ELEMENTS or FAST_*_ELEMENTS,
+  // and value is Smi.
   __ bind(&smi_element);
   __ mov(ebx, FieldOperand(ebx, JSObject::kElementsOffset));
   __ mov(FieldOperand(ebx, ecx, times_half_pointer_size,
                       FixedArrayBase::kHeaderSize), eax);
   __ ret(0);
 
-  // Array literal has ElementsKind of FAST_DOUBLE_ELEMENTS.
+  // Array literal has ElementsKind of FAST_*_DOUBLE_ELEMENTS.
   __ bind(&double_elements);
 
   __ push(edx);