diff graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/type/TopStamp.java @ 5820:547587296886

Make ReadEliminationPhase support phis (eliminates read when the last access is a memeory phi of writes, recursively) Add a TopStamp (identity element for meet) and use it to create kind-less phis that later get a non-top phi by infering thir stamp thanks to inputs ignore binary graph files
author Gilles Duboscq <duboscq@ssw.jku.at>
date Thu, 12 Jul 2012 18:58:36 +0200
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/type/TopStamp.java	Thu Jul 12 18:58:36 2012 +0200
@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package com.oracle.graal.nodes.type;
+
+
+public final class TopStamp extends Stamp {
+
+    TopStamp() {
+        super(null);
+    }
+
+    @Override
+    public boolean alwaysDistinct(Stamp other) {
+        return false;
+    }
+
+    @Override
+    public Stamp meet(Stamp other) {
+        return other;
+    }
+
+}