Basic support for tracking smi-only arrays on ia32.

src/arm/stub-cache-arm.cc

Index: src/arm/stub-cache-arm.cc
diff --git a/src/arm/stub-cache-arm.cc b/src/arm/stub-cache-arm.cc
index 2f004d8b14a3f71e5c2403484684916744b2c601..b005f59b9feb11efe6ee0f9229b8c442ed08ab1c 100644
--- a/src/arm/stub-cache-arm.cc
+++ b/src/arm/stub-cache-arm.cc
@@ -3493,6 +3493,7 @@ static bool IsElementTypeSigned(ElementsKind elements_kind) {
     case EXTERNAL_FLOAT_ELEMENTS:
     case EXTERNAL_DOUBLE_ELEMENTS:
     case FAST_ELEMENTS:
+    case FAST_SMI_ONLY_ELEMENTS:
     case FAST_DOUBLE_ELEMENTS:
     case DICTIONARY_ELEMENTS:
     case NON_STRICT_ARGUMENTS_ELEMENTS:
@@ -3579,6 +3580,7 @@ void KeyedLoadStubCompiler::GenerateLoadExternalArray(
       }
       break;
     case FAST_ELEMENTS:
+    case FAST_SMI_ONLY_ELEMENTS:
     case FAST_DOUBLE_ELEMENTS:
     case DICTIONARY_ELEMENTS:
     case NON_STRICT_ARGUMENTS_ELEMENTS:
@@ -3919,6 +3921,7 @@ void KeyedStoreStubCompiler::GenerateStoreExternalArray(
       }
       break;
     case FAST_ELEMENTS:
+    case FAST_SMI_ONLY_ELEMENTS:
     case FAST_DOUBLE_ELEMENTS:
     case DICTIONARY_ELEMENTS:
     case NON_STRICT_ARGUMENTS_ELEMENTS:
@@ -3982,6 +3985,7 @@ void KeyedStoreStubCompiler::GenerateStoreExternalArray(
           case EXTERNAL_FLOAT_ELEMENTS:
           case EXTERNAL_DOUBLE_ELEMENTS:
           case FAST_ELEMENTS:
+          case FAST_SMI_ONLY_ELEMENTS:
           case FAST_DOUBLE_ELEMENTS:
           case DICTIONARY_ELEMENTS:
           case NON_STRICT_ARGUMENTS_ELEMENTS:
@@ -4121,6 +4125,7 @@ void KeyedStoreStubCompiler::GenerateStoreExternalArray(
           case EXTERNAL_FLOAT_ELEMENTS:
           case EXTERNAL_DOUBLE_ELEMENTS:
           case FAST_ELEMENTS:
+          case FAST_SMI_ONLY_ELEMENTS:
           case FAST_DOUBLE_ELEMENTS:
           case DICTIONARY_ELEMENTS:
           case NON_STRICT_ARGUMENTS_ELEMENTS:
@@ -4273,8 +4278,10 @@ void KeyedLoadStubCompiler::GenerateLoadFastDoubleElement(
 }
 
 
-void KeyedStoreStubCompiler::GenerateStoreFastElement(MacroAssembler* masm,
-                                                      bool is_js_array) {
+void KeyedStoreStubCompiler::GenerateStoreFastElement(
+    MacroAssembler* masm,
+    bool is_js_array,
+    ElementsKind elements_kind) {
   // ----------- S t a t e -------------
   //  -- r0    : value
   //  -- r1    : key
@@ -4324,6 +4331,7 @@ void KeyedStoreStubCompiler::GenerateStoreFastElement(MacroAssembler* masm,
          Operand(key_reg, LSL, kPointerSizeLog2 - kSmiTagSize));
   __ str(value_reg, MemOperand(scratch));
   __ mov(receiver_reg, value_reg);
+  ASSERT(elements_kind == FAST_ELEMENTS);
   __ RecordWrite(elements_reg,  // Object.
                  scratch,       // Address.
                  receiver_reg,  // Value.