Minor object store optimizations.

- Avoid emitting write barrier when the value is null.
- Do not do a typecheck on an arraystore when storing something that
  was loaded from the same array.

Change-Id: I902492928692e4553b5af0fc99cce3c2186c442a

1 files changed, 9 insertions, 0 deletions

diff --git a/compiler/optimizing/code_generator.h b/compiler/optimizing/code_generator.h
index ac4fc67c2c..a046ade929 100644
--- a/compiler/optimizing/code_generator.h
+++ b/compiler/optimizing/code_generator.h
@@ -168,6 +168,15 @@ class CodeGenerator : public ArenaObject<kArenaAllocMisc> {
 
   void EmitParallelMoves(Location from1, Location to1, Location from2, Location to2);
 
+  static bool StoreNeedsWriteBarrier(Primitive::Type type, HInstruction* value) {
+    if (kIsDebugBuild) {
+      if (type == Primitive::kPrimNot && value->IsIntConstant()) {
+        CHECK(value->AsIntConstant()->GetValue() == 0);
+      }
+    }
+    return type == Primitive::kPrimNot && !value->IsIntConstant();
+  }
+
  protected:
   CodeGenerator(HGraph* graph,
                 size_t number_of_core_registers,