Guard 32-bit SMI load/store optimization with SmiValuesAre32Bits predicate.

R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/228073004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@20634 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/x64/lithium-codegen-x64.cc

@@ -2902,7 +2902,7 @@ void LCodeGen::DoLoadNamedField(LLoadNamedField* instr) {
   }
 
   Representation representation = access.representation();
-  if (representation.IsSmi() &&
+  if (representation.IsSmi() && SmiValuesAre32Bits() &&
       instr->hydrogen()->representation().IsInteger32()) {
 #ifdef DEBUG
     Register scratch = kScratchRegister;
@@ -2912,7 +2912,7 @@ void LCodeGen::DoLoadNamedField(LLoadNamedField* instr) {
 
     // Read int value directly from upper half of the smi.
     STATIC_ASSERT(kSmiTag == 0);
-    STATIC_ASSERT(kSmiTagSize + kSmiShiftSize == 32);
+    ASSERT(kSmiTagSize + kSmiShiftSize == 32);
     offset += kPointerSize / 2;
     representation = Representation::Integer32();
   }
@@ -3116,7 +3116,7 @@ void LCodeGen::DoLoadKeyedFixedArray(LLoadKeyed* instr) {
   int offset = FixedArray::kHeaderSize - kHeapObjectTag;
   Representation representation = hinstr->representation();
 
-  if (representation.IsInteger32() &&
+  if (representation.IsInteger32() && SmiValuesAre32Bits() &&
       hinstr->elements_kind() == FAST_SMI_ELEMENTS) {
     ASSERT(!requires_hole_check);
 #ifdef DEBUG
@@ -3132,7 +3132,7 @@ void LCodeGen::DoLoadKeyedFixedArray(LLoadKeyed* instr) {
 #endif
     // Read int value directly from upper half of the smi.
     STATIC_ASSERT(kSmiTag == 0);
-    STATIC_ASSERT(kSmiTagSize + kSmiShiftSize == 32);
+    ASSERT(kSmiTagSize + kSmiShiftSize == 32);
     offset += kPointerSize / 2;
   }
 
@@ -4040,7 +4040,7 @@ void LCodeGen::DoStoreNamedField(LStoreNamedField* instr) {
     __ movp(write_register, FieldOperand(object, JSObject::kPropertiesOffset));
   }
 
-  if (representation.IsSmi() &&
+  if (representation.IsSmi() && SmiValuesAre32Bits() &&
       hinstr->value()->representation().IsInteger32()) {
     ASSERT(hinstr->store_mode() == STORE_TO_INITIALIZED_ENTRY);
 #ifdef DEBUG
@@ -4050,7 +4050,7 @@ void LCodeGen::DoStoreNamedField(LStoreNamedField* instr) {
 #endif
     // Store int value directly to upper half of the smi.
     STATIC_ASSERT(kSmiTag == 0);
-    STATIC_ASSERT(kSmiTagSize + kSmiShiftSize == 32);
+    ASSERT(kSmiTagSize + kSmiShiftSize == 32);
     offset += kPointerSize / 2;
     representation = Representation::Integer32();
   }
@@ -4263,7 +4263,7 @@ void LCodeGen::DoStoreKeyedFixedArray(LStoreKeyed* instr) {
   int offset = FixedArray::kHeaderSize - kHeapObjectTag;
   Representation representation = hinstr->value()->representation();
 
-  if (representation.IsInteger32()) {
+  if (representation.IsInteger32() && SmiValuesAre32Bits()) {
     ASSERT(hinstr->store_mode() == STORE_TO_INITIALIZED_ENTRY);
     ASSERT(hinstr->elements_kind() == FAST_SMI_ELEMENTS);
 #ifdef DEBUG
@@ -4279,7 +4279,7 @@ void LCodeGen::DoStoreKeyedFixedArray(LStoreKeyed* instr) {
 #endif
     // Store int value directly to upper half of the smi.
     STATIC_ASSERT(kSmiTag == 0);
-    STATIC_ASSERT(kSmiTagSize + kSmiShiftSize == 32);
+    ASSERT(kSmiTagSize + kSmiShiftSize == 32);
     offset += kPointerSize / 2;
   }