--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.max.asmdis/src/com/sun/max/asm/gen/risc/field/AlignedImmediateOperandField.java	Sat Dec 17 19:59:18 2011 +0100
@@ -0,0 +1,108 @@
+/*
+ * Copyright (c) 2007, 2011, 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.sun.max.asm.gen.risc.field;
+
+import java.util.*;
+
+import com.sun.max.asm.*;
+import com.sun.max.asm.gen.*;
+import com.sun.max.asm.gen.risc.bitRange.*;
+
+/**
+ * An instruction field whose encoded value does not include bits for
+ * the low-order 0 bits of the aligned values that the field represents.
+ * This class can convert between the field's <i>argument</i> (i.e.
+ * the represented value) and it's <i>operand</i> (i.e. the encoded value).
+ */
+public class AlignedImmediateOperandField extends ImmediateOperandField {
+
+    protected int zeroes;
+
+    public AlignedImmediateOperandField(BitRange bitRange, int zeroes) {
+        super(bitRange);
+        this.zeroes = zeroes;
+    }
+
+    @Override
+    public String asJavaExpression() {
+        final String value = valueString();
+        return "(" + super.asJavaExpression() + ") && ((" + value + " % " + grain() + ") == 0)";
+    }
+
+    @Override
+    public boolean check(Template template, List<Argument> arguments) {
+        if (!super.check(template, arguments)) {
+            return false;
+        }
+        final long value = template.bindingFor(this, arguments).asLong();
+        return (value % grain()) == 0;
+    }
+
+    @Override
+    public int maxArgumentValue() {
+        return super.maxArgumentValue() << zeroes();
+    }
+
+    @Override
+    public int minArgumentValue() {
+        return super.minArgumentValue() << zeroes();
+    }
+
+    @Override
+    public int zeroes() {
+        return zeroes;
+    }
+
+    /**
+     * Converts an argument value to the operand value that does not include bits for the
+     * implied low-order 0 bits that the aligned argument value is guaranteed to contain.
+     * For example, if this field represents a 4-byte aligned value, then {@code argumentToOperand(536) == 134}.
+     */
+    private int argumentToOperand(int value) throws AssemblyException {
+        final int p = grain();
+        if (value % p != 0) {
+            throw new AssemblyException("unaligned immediate operand: " + value);
+        }
+        return value / p;
+    }
+
+    /**
+     * Converts an operand value to the argument value that includes
+     * low-order 0 bits for the alignment of this field.
+     * For example, if this field represents a 4-byte aligned value,
+     * then {@code operandToArgument(134) == 536}.
+     */
+    private int operandToArgument(int operand) {
+        return operand << zeroes();
+    }
+
+    @Override
+    public int assemble(int value) throws IndexOutOfBoundsException, AssemblyException {
+        return super.assemble(argumentToOperand(value));
+    }
+
+    @Override
+    public Immediate32Argument disassemble(int instruction) {
+        return new Immediate32Argument(operandToArgument(extract(instruction)));
+    }
+}