# HG changeset patch
# User Roland Schatz <roland.schatz@oracle.com>
# Date 1403602982 -7200
# Node ID ef1834ac566c1a4e5c7b600f28c1d51f9cb62e8a
# Parent  5785eca138b08f340d4476a8b144751b4d4816fd
Fold nodes with alwaysNull stamp into constant.

diff -r 5785eca138b0 -r ef1834ac566c graal/com.oracle.graal.compiler.common/src/com/oracle/graal/compiler/common/type/ObjectStamp.java
--- a/graal/com.oracle.graal.compiler.common/src/com/oracle/graal/compiler/common/type/ObjectStamp.java	Mon Jun 23 18:04:15 2014 -0700
+++ b/graal/com.oracle.graal.compiler.common/src/com/oracle/graal/compiler/common/type/ObjectStamp.java	Tue Jun 24 11:43:02 2014 +0200
@@ -64,4 +64,13 @@
         }
         return false;
     }
+
+    @Override
+    public Constant asConstant() {
+        if (alwaysNull()) {
+            return Constant.NULL_OBJECT;
+        } else {
+            return null;
+        }
+    }
 }
diff -r 5785eca138b0 -r ef1834ac566c graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/nodes/type/NarrowOopStamp.java
--- a/graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/nodes/type/NarrowOopStamp.java	Mon Jun 23 18:04:15 2014 -0700
+++ b/graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/nodes/type/NarrowOopStamp.java	Tue Jun 24 11:43:02 2014 +0200
@@ -26,6 +26,7 @@
 import com.oracle.graal.compiler.common.spi.*;
 import com.oracle.graal.compiler.common.type.*;
 import com.oracle.graal.hotspot.HotSpotVMConfig.CompressEncoding;
+import com.oracle.graal.hotspot.meta.*;
 
 public class NarrowOopStamp extends AbstractObjectStamp {
 
@@ -100,4 +101,13 @@
         }
         return super.equals(other);
     }
+
+    @Override
+    public Constant asConstant() {
+        if (alwaysNull()) {
+            return HotSpotCompressedNullConstant.COMPRESSED_NULL;
+        } else {
+            return null;
+        }
+    }
 }