[GR-20260] Amends NarrowNode.reverseOp to be ZeroExtend instead of Si…

…gnExtend.

PullRequest: graal/5124

compiler/src/org.graalvm.compiler.jtt/src/org/graalvm/compiler/jtt/optimize/Narrow_byte04.java

@@ -0,0 +1,55 @@
+/*
+ * Copyright (c) 2018, 2019, 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.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * 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 org.graalvm.compiler.jtt.optimize;
+
+import org.graalvm.compiler.jtt.JTTTest;
+import org.junit.Test;
+
+/*
+ */
+public class Narrow_byte04 extends JTTTest {
+    static final byte NEG_FLAG = (byte) -80;
+
+    public static byte test(byte b) {
+        byte hBits = (byte) (b & 0xF0);
+        byte loBits = (byte) (b & 0x0F);
+        return hBits == NEG_FLAG ? loBits : b;
+    }
+
+    @Test
+    public void run0() throws Throwable {
+        runTest("test", ((byte) 0xb1));
+    }
+
+    @Test
+    public void run1() throws Throwable {
+        runTest("test", ((byte) 0xFF));
+    }
+
+    @Test
+    public void run3() throws Throwable {
+        runTest("test", ((byte) 0));
+    }
+}

compiler/src/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/calc/NarrowNode.java

@@ -31,7 +31,6 @@
 import org.graalvm.compiler.core.common.type.ArithmeticOpTable;
 import org.graalvm.compiler.core.common.type.ArithmeticOpTable.IntegerConvertOp;
 import org.graalvm.compiler.core.common.type.ArithmeticOpTable.IntegerConvertOp.Narrow;
-import org.graalvm.compiler.core.common.type.ArithmeticOpTable.IntegerConvertOp.SignExtend;
 import org.graalvm.compiler.core.common.type.IntegerStamp;
 import org.graalvm.compiler.core.common.type.PrimitiveStamp;
 import org.graalvm.compiler.core.common.type.Stamp;
@@ -49,7 +48,7 @@
  * The {@code NarrowNode} converts an integer to a narrower integer.
  */
 @NodeInfo(cycles = CYCLES_1)
-public final class NarrowNode extends IntegerConvertNode<Narrow, SignExtend> {
+public final class NarrowNode extends IntegerConvertNode<Narrow, IntegerConvertOp.ZeroExtend> {
 
     public static final NodeClass<NarrowNode> TYPE = NodeClass.create(NarrowNode.class);
 
@@ -82,8 +81,8 @@ protected IntegerConvertOp<Narrow> getOp(ArithmeticOpTable table) {
     }
 
     @Override
-    protected IntegerConvertOp<SignExtend> getReverseOp(ArithmeticOpTable table) {
-        return table.getSignExtend();
+    protected IntegerConvertOp<IntegerConvertOp.ZeroExtend> getReverseOp(ArithmeticOpTable table) {
+        return table.getZeroExtend();
     }
 
     @Override