diff --git a/baksmali/src/main/java/org/jf/baksmali/Adaptors/Format/InstructionMethodItem.java b/baksmali/src/main/java/org/jf/baksmali/Adaptors/Format/InstructionMethodItem.java
index e9c871da..75d19741 100644
--- a/baksmali/src/main/java/org/jf/baksmali/Adaptors/Format/InstructionMethodItem.java
+++ b/baksmali/src/main/java/org/jf/baksmali/Adaptors/Format/InstructionMethodItem.java
@@ -212,8 +212,7 @@ public class InstructionMethodItem<T extends Instruction> extends MethodItem {
                 writer.write(", ");
                 writeReference(writer);
                 return true;
-            //TODO: uncomment
-            /*case Format3rmi:
+            case Format3rmi:
                 writeOpcode(writer);
                 writer.write(' ');
                 writeInvokeRangeRegisters(writer);
@@ -226,7 +225,7 @@ public class InstructionMethodItem<T extends Instruction> extends MethodItem {
                 writeInvokeRangeRegisters(writer);
                 writer.write(", ");
                 writeVtableIndex(writer);
-                return true;*/
+                return true;
         }
         assert false;
         return false;
diff --git a/dexlib2/src/main/java/org/jf/dexlib2/dexbacked/instruction/DexBackedInstruction.java b/dexlib2/src/main/java/org/jf/dexlib2/dexbacked/instruction/DexBackedInstruction.java
index 0ba0e722..e0613818 100644
--- a/dexlib2/src/main/java/org/jf/dexlib2/dexbacked/instruction/DexBackedInstruction.java
+++ b/dexlib2/src/main/java/org/jf/dexlib2/dexbacked/instruction/DexBackedInstruction.java
@@ -128,6 +128,10 @@ public abstract class DexBackedInstruction implements Instruction {
                 return new DexBackedInstruction35mi(dexFile, opcode, instructionStartOffset);
             case Format3rc:
                 return new DexBackedInstruction3rc(dexFile, opcode, instructionStartOffset);
+            case Format3rmi:
+                return new DexBackedInstruction3rmi(dexFile, opcode, instructionStartOffset);
+            case Format3rms:
+                return new DexBackedInstruction3rms(dexFile, opcode, instructionStartOffset);
             case Format51l:
                 return new DexBackedInstruction51l(dexFile, opcode, instructionStartOffset);
             case PackedSwitchPayload:
diff --git a/dexlib2/src/main/java/org/jf/dexlib2/dexbacked/instruction/DexBackedInstruction3rmi.java b/dexlib2/src/main/java/org/jf/dexlib2/dexbacked/instruction/DexBackedInstruction3rmi.java
new file mode 100644
index 00000000..7b79d7e7
--- /dev/null
+++ b/dexlib2/src/main/java/org/jf/dexlib2/dexbacked/instruction/DexBackedInstruction3rmi.java
@@ -0,0 +1,60 @@
+/*
+ * Copyright 2013, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package org.jf.dexlib2.dexbacked.instruction;
+
+import org.jf.dexlib2.Opcode;
+import org.jf.dexlib2.dexbacked.DexBackedDexFile;
+import org.jf.dexlib2.iface.instruction.formats.Instruction3rmi;
+
+import javax.annotation.Nonnull;
+
+public class DexBackedInstruction3rmi extends DexBackedInstruction implements Instruction3rmi {
+    public DexBackedInstruction3rmi(@Nonnull DexBackedDexFile dexFile,
+                                    @Nonnull Opcode opcode,
+                                    int instructionStart) {
+        super(dexFile, opcode, instructionStart);
+    }
+
+    @Override public int getRegisterCount() {
+        return dexFile.readUbyte(instructionStart + 1);
+    }
+
+    @Override
+    public int getStartRegister() {
+        return dexFile.readUshort(instructionStart + 4);
+    }
+
+    @Override
+    public int getInlineIndex() {
+        return dexFile.readUshort(instructionStart + 2);
+    }
+}
diff --git a/dexlib2/src/main/java/org/jf/dexlib2/dexbacked/instruction/DexBackedInstruction3rms.java b/dexlib2/src/main/java/org/jf/dexlib2/dexbacked/instruction/DexBackedInstruction3rms.java
new file mode 100644
index 00000000..eff952e0
--- /dev/null
+++ b/dexlib2/src/main/java/org/jf/dexlib2/dexbacked/instruction/DexBackedInstruction3rms.java
@@ -0,0 +1,60 @@
+/*
+ * Copyright 2013, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package org.jf.dexlib2.dexbacked.instruction;
+
+import org.jf.dexlib2.Opcode;
+import org.jf.dexlib2.dexbacked.DexBackedDexFile;
+import org.jf.dexlib2.iface.instruction.formats.Instruction3rms;
+
+import javax.annotation.Nonnull;
+
+public class DexBackedInstruction3rms extends DexBackedInstruction implements Instruction3rms {
+    public DexBackedInstruction3rms(@Nonnull DexBackedDexFile dexFile,
+                                    @Nonnull Opcode opcode,
+                                    int instructionStart) {
+        super(dexFile, opcode, instructionStart);
+    }
+
+    @Override public int getRegisterCount() {
+        return dexFile.readUbyte(instructionStart + 1);
+    }
+
+    @Override
+    public int getStartRegister() {
+        return dexFile.readUshort(instructionStart + 4);
+    }
+
+    @Override
+    public int getVtableIndex() {
+        return dexFile.readUshort(instructionStart + 2);
+    }
+}
diff --git a/dexlib2/src/main/java/org/jf/dexlib2/iface/instruction/formats/Instruction3rmi.java b/dexlib2/src/main/java/org/jf/dexlib2/iface/instruction/formats/Instruction3rmi.java
new file mode 100644
index 00000000..246dbf60
--- /dev/null
+++ b/dexlib2/src/main/java/org/jf/dexlib2/iface/instruction/formats/Instruction3rmi.java
@@ -0,0 +1,38 @@
+/*
+ * Copyright 2013, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package org.jf.dexlib2.iface.instruction.formats;
+
+import org.jf.dexlib2.iface.instruction.InlineIndexInstruction;
+import org.jf.dexlib2.iface.instruction.RegisterRangeInstruction;
+
+public interface Instruction3rmi extends RegisterRangeInstruction, InlineIndexInstruction {
+}
diff --git a/dexlib2/src/main/java/org/jf/dexlib2/iface/instruction/formats/Instruction3rms.java b/dexlib2/src/main/java/org/jf/dexlib2/iface/instruction/formats/Instruction3rms.java
new file mode 100644
index 00000000..c01200d7
--- /dev/null
+++ b/dexlib2/src/main/java/org/jf/dexlib2/iface/instruction/formats/Instruction3rms.java
@@ -0,0 +1,38 @@
+/*
+ * Copyright 2013, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package org.jf.dexlib2.iface.instruction.formats;
+
+import org.jf.dexlib2.iface.instruction.RegisterRangeInstruction;
+import org.jf.dexlib2.iface.instruction.VtableIndexInstruction;
+
+public interface Instruction3rms extends RegisterRangeInstruction, VtableIndexInstruction {
+}
diff --git a/dexlib2/src/main/java/org/jf/dexlib2/immutable/instruction/ImmutableInstruction.java b/dexlib2/src/main/java/org/jf/dexlib2/immutable/instruction/ImmutableInstruction.java
index 9311c097..d32c46a5 100644
--- a/dexlib2/src/main/java/org/jf/dexlib2/immutable/instruction/ImmutableInstruction.java
+++ b/dexlib2/src/main/java/org/jf/dexlib2/immutable/instruction/ImmutableInstruction.java
@@ -111,6 +111,10 @@ public abstract class ImmutableInstruction implements Instruction {
                 return ImmutableInstruction35ms.of((Instruction35ms)instruction);
             case Format3rc:
                 return ImmutableInstruction3rc.of((Instruction3rc)instruction);
+            case Format3rmi:
+                return ImmutableInstruction3rmi.of((Instruction3rmi)instruction);
+            case Format3rms:
+                return ImmutableInstruction3rms.of((Instruction3rms)instruction);
             case Format51l:
                 return ImmutableInstruction51l.of((Instruction51l)instruction);
             case PackedSwitchPayload:
diff --git a/dexlib2/src/main/java/org/jf/dexlib2/immutable/instruction/ImmutableInstruction3rc.java b/dexlib2/src/main/java/org/jf/dexlib2/immutable/instruction/ImmutableInstruction3rc.java
index 22992a7d..19e211bd 100644
--- a/dexlib2/src/main/java/org/jf/dexlib2/immutable/instruction/ImmutableInstruction3rc.java
+++ b/dexlib2/src/main/java/org/jf/dexlib2/immutable/instruction/ImmutableInstruction3rc.java
@@ -54,9 +54,9 @@ public class ImmutableInstruction3rc extends ImmutableInstruction implements Ins
                                    int registerCount,
                                    @Nonnull Reference reference) {
         super(opcode);
-        Preconditions.checkFormat(opcode, Format.Format3rc);
+        Preconditions.checkFormat(opcode, FORMAT);
         this.startRegister = Preconditions.checkShortRegister(startRegister);
-        this.registerCount = Preconditions.check3rcRegisterCount(registerCount);
+        this.registerCount = Preconditions.checkRegisterRangeCount(registerCount);
         this.reference = ImmutableReferenceFactory.of(opcode.referenceType, reference);
     }
 
diff --git a/dexlib2/src/main/java/org/jf/dexlib2/immutable/instruction/ImmutableInstruction3rmi.java b/dexlib2/src/main/java/org/jf/dexlib2/immutable/instruction/ImmutableInstruction3rmi.java
new file mode 100644
index 00000000..6943930e
--- /dev/null
+++ b/dexlib2/src/main/java/org/jf/dexlib2/immutable/instruction/ImmutableInstruction3rmi.java
@@ -0,0 +1,77 @@
+/*
+ * Copyright 2013, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package org.jf.dexlib2.immutable.instruction;
+
+import org.jf.dexlib2.Format;
+import org.jf.dexlib2.Opcode;
+import org.jf.dexlib2.iface.instruction.formats.Instruction3rmi;
+import org.jf.dexlib2.util.Preconditions;
+
+import javax.annotation.Nonnull;
+
+public class ImmutableInstruction3rmi extends ImmutableInstruction implements Instruction3rmi {
+    public static final Format FORMAT = Format.Format3rmi;
+
+    protected final int startRegister;
+    protected final int registerCount;
+
+    protected final int inlineIndex;
+
+    public ImmutableInstruction3rmi(@Nonnull Opcode opcode,
+                                    int startRegister,
+                                    int registerCount,
+                                    int inlineIndex) {
+        super(opcode);
+        Preconditions.checkFormat(opcode, FORMAT);
+        this.startRegister = Preconditions.checkShortRegister(startRegister);
+        this.registerCount = Preconditions.checkRegisterRangeCount(registerCount);
+        this.inlineIndex = Preconditions.checkInlineIndex(inlineIndex);
+    }
+
+    public static ImmutableInstruction3rmi of(Instruction3rmi instruction) {
+        if (instruction instanceof ImmutableInstruction3rmi) {
+            return (ImmutableInstruction3rmi)instruction;
+        }
+        return new ImmutableInstruction3rmi(
+                instruction.getOpcode(),
+                instruction.getStartRegister(),
+                instruction.getRegisterCount(),
+                instruction.getInlineIndex());
+    }
+
+    @Override public int getStartRegister() { return startRegister; }
+    @Override public int getRegisterCount() { return registerCount; }
+    @Override public int getInlineIndex() { return inlineIndex; }
+
+    @Override public Format getFormat() { return FORMAT; }
+}
+
diff --git a/dexlib2/src/main/java/org/jf/dexlib2/immutable/instruction/ImmutableInstruction3rms.java b/dexlib2/src/main/java/org/jf/dexlib2/immutable/instruction/ImmutableInstruction3rms.java
new file mode 100644
index 00000000..f1e72d25
--- /dev/null
+++ b/dexlib2/src/main/java/org/jf/dexlib2/immutable/instruction/ImmutableInstruction3rms.java
@@ -0,0 +1,77 @@
+/*
+ * Copyright 2013, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package org.jf.dexlib2.immutable.instruction;
+
+import org.jf.dexlib2.Format;
+import org.jf.dexlib2.Opcode;
+import org.jf.dexlib2.iface.instruction.formats.Instruction3rms;
+import org.jf.dexlib2.util.Preconditions;
+
+import javax.annotation.Nonnull;
+
+public class ImmutableInstruction3rms extends ImmutableInstruction implements Instruction3rms {
+    public static final Format FORMAT = Format.Format3rms;
+
+    protected final int startRegister;
+    protected final int registerCount;
+
+    protected final int vtableIndex;
+
+    public ImmutableInstruction3rms(@Nonnull Opcode opcode,
+                                    int startRegister,
+                                    int registerCount,
+                                    int vtableIndex) {
+        super(opcode);
+        Preconditions.checkFormat(opcode, FORMAT);
+        this.startRegister = Preconditions.checkShortRegister(startRegister);
+        this.registerCount = Preconditions.checkRegisterRangeCount(registerCount);
+        this.vtableIndex = Preconditions.checkVtableIndex(vtableIndex);
+    }
+
+    public static ImmutableInstruction3rms of(Instruction3rms instruction) {
+        if (instruction instanceof ImmutableInstruction3rms) {
+            return (ImmutableInstruction3rms)instruction;
+        }
+        return new ImmutableInstruction3rms(
+                instruction.getOpcode(),
+                instruction.getStartRegister(),
+                instruction.getRegisterCount(),
+                instruction.getVtableIndex());
+    }
+
+    @Override public int getStartRegister() { return startRegister; }
+    @Override public int getRegisterCount() { return registerCount; }
+    @Override public int getVtableIndex() { return vtableIndex; }
+
+    @Override public Format getFormat() { return FORMAT; }
+}
+
diff --git a/dexlib2/src/main/java/org/jf/dexlib2/util/Preconditions.java b/dexlib2/src/main/java/org/jf/dexlib2/util/Preconditions.java
index e8e33b32..ea9cfb69 100644
--- a/dexlib2/src/main/java/org/jf/dexlib2/util/Preconditions.java
+++ b/dexlib2/src/main/java/org/jf/dexlib2/util/Preconditions.java
@@ -130,7 +130,7 @@ public class Preconditions {
         return registerCount;
     }
 
-    public static int check3rcRegisterCount(int registerCount) {
+    public static int checkRegisterRangeCount(int registerCount) {
         if ((registerCount & 0xFFFFFF00) != 0) {
             throw new IllegalArgumentException(
                     String.format("Invalid register count: %d. Must be between 0 and 255, inclusive.", registerCount));