Mercurial > hg > graal-compiler

changeset 22259:2241ccc653a0

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ValuePhiNode should be an ArrayLengthProvider
author Tom Rodriguez <tom.rodriguez@oracle.com>
date Mon, 20 Jul 2015 11:19:06 -0700
parents 4a07b29e44c4
children f68516869b75
files graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/ValuePhiNode.java
diffstat 1 files changed, 22 insertions(+), 1 deletions(-) [+]
line wrap: on
line diff
--- a/graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/ValuePhiNode.java	Mon Jul 20 11:18:50 2015 -0700
+++ b/graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/ValuePhiNode.java	Mon Jul 20 11:19:06 2015 -0700
@@ -25,13 +25,15 @@
 import com.oracle.graal.compiler.common.type.*;
 import com.oracle.graal.graph.*;
 import com.oracle.graal.nodeinfo.*;
+import com.oracle.graal.nodes.spi.*;
 import com.oracle.graal.nodes.type.*;
+import com.oracle.graal.nodes.util.*;
 
 /**
  * Value {@link PhiNode}s merge data flow values at control flow merges.
  */
 @NodeInfo(nameTemplate = "Phi({i#values})")
-public class ValuePhiNode extends PhiNode {
+public class ValuePhiNode extends PhiNode implements ArrayLengthProvider {
 
     public static final NodeClass<ValuePhiNode> TYPE = NodeClass.create(ValuePhiNode.class);
     @Input protected NodeInputList<ValueNode> values;
@@ -65,4 +67,23 @@
         }
         return updateStamp(valuesStamp);
     }
+
+    public ValueNode length() {
+        if (merge() instanceof LoopBeginNode) {
+            return null;
+        }
+        ValueNode length = null;
+        for (ValueNode input : values()) {
+            ValueNode l = GraphUtil.arrayLength(input);
+            if (l == null) {
+                return null;
+            }
+            if (length == null) {
+                length = l;
+            } else if (length != l) {
+                return null;
+            }
+        }
+        return length;
+    }
 }