Require smi for keyed store to smi.

R=jkummerow@chromium.org

Review URL: https://chromiumcodereview.appspot.com/15884002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@14779 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/arm/lithium-arm.cc

@@ -2252,7 +2252,7 @@ LInstruction* LChunkBuilder::DoStoreKeyed(HStoreKeyed* instr) {
       val = UseTempRegister(instr->value());
       key = UseRegisterOrConstantAtStart(instr->key());
     } else {
-      ASSERT(instr->value()->representation().IsTagged());
+      ASSERT(instr->value()->representation().IsSmiOrTagged());
       object = UseTempRegister(instr->elements());
       val = needs_write_barrier ? UseTempRegister(instr->value())
           : UseRegisterAtStart(instr->value());

src/hydrogen-instructions.h

@@ -5723,6 +5723,9 @@ class HStoreKeyed
     } else if (IsFastDoubleElementsKind(elements_kind)) {
       SetGVNFlag(kChangesDoubleArrayElements);
       SetFlag(kDeoptimizeOnUndefined);
+    } else if (IsFastSmiElementsKind(elements_kind)) {
+      SetGVNFlag(kChangesArrayElements);
+      SetFlag(kDeoptimizeOnUndefined);
     } else {
       SetGVNFlag(kChangesArrayElements);
     }
@@ -5751,6 +5754,10 @@ class HStoreKeyed
       return Representation::Double();
     }
 
+    if (IsFastSmiElementsKind(elements_kind())) {
+      return Representation::Smi();
+    }
+
     return is_external() ? Representation::Integer32()
                          : Representation::Tagged();
   }

src/ia32/lithium-ia32.cc

@@ -2344,7 +2344,7 @@ LInstruction* LChunkBuilder::DoStoreKeyed(HStoreKeyed* instr) {
       LOperand* key = UseRegisterOrConstantAtStart(instr->key());
       return new(zone()) LStoreKeyed(object, key, val);
     } else {
-      ASSERT(instr->value()->representation().IsTagged());
+      ASSERT(instr->value()->representation().IsSmiOrTagged());
       bool needs_write_barrier = instr->NeedsWriteBarrier();
 
       LOperand* obj = UseRegister(instr->elements());

src/x64/lithium-x64.cc

@@ -2172,7 +2172,7 @@ LInstruction* LChunkBuilder::DoStoreKeyed(HStoreKeyed* instr) {
       key = clobbers_key ? UseTempRegister(instr->key())
           : UseRegisterOrConstantAtStart(instr->key());
     } else {
-      ASSERT(instr->value()->representation().IsTagged());
+      ASSERT(instr->value()->representation().IsSmiOrTagged());
       object = UseTempRegister(instr->elements());
       if (needs_write_barrier) {
         val = UseTempRegister(instr->value());