commit 6a791b26577a61fd14f4836c795d616869bd2957
author buzbee <buzbee@google.com> Thu Feb 07 05:35:08 2013 -0800
committer buzbee <buzbee@google.com> Thu Feb 07 05:35:08 2013 -0800
tree b2beddd9fda1daf451805aa416137f80d84782f2
parent 4ef3e45d7c6ec3c482a1a48f4df470811aa3cf0a

Skip card mark when storing known null reference

We don't need to mark the gc card if storing a null reference.

Change-Id: I445db196a097ed92b67b8bf1e6b486c6fac7d08f

src/compiler/codegen/gen_common.cc

diff --git a/src/compiler/codegen/gen_common.cc b/src/compiler/codegen/gen_common.cc
index a4c8d0c..40ec2bf 100644
--- a/src/compiler/codegen/gen_common.cc
+++ b/src/compiler/codegen/gen_common.cc
@@ -425,7 +425,7 @@
     if (is_volatile) {
       GenMemBarrier(cu, kStoreLoad);
     }
-    if (is_object) {
+    if (is_object && !IsConstantNullRef(cu, rl_src)) {
       MarkGCCard(cu, rl_src.low_reg, rBase);
     }
     FreeTemp(cu, rBase);
@@ -766,7 +766,7 @@
       if (is_volatile) {
         GenMemBarrier(cu, kLoadLoad);
       }
-      if (is_object) {
+      if (is_object && !IsConstantNullRef(cu, rl_src)) {
         MarkGCCard(cu, rl_src.low_reg, rl_obj.low_reg);
       }
     }