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diff --git a/vm/mterp/x86-atom/unop.S b/vm/mterp/x86-atom/unop.S
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+++ b/vm/mterp/x86-atom/unop.S
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+   /* Copyright (C) 2008 The Android Open Source Project
+    *
+    * Licensed under the Apache License, Version 2.0 (the "License");
+    * you may not use this file except in compliance with the License.
+    * You may obtain a copy of the License at
+    *
+    * http://www.apache.org/licenses/LICENSE-2.0
+    *
+    * Unless required by applicable law or agreed to in writing, software
+    * distributed under the License is distributed on an "AS IS" BASIS,
+    * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    * See the License for the specific language governing permissions and
+    * limitations under the License.
+    */
+
+   /*
+    * File: unop.S
+    *
+    * Code: Generic 32-bit unary operation. Provide an "instr" variable and a
+    *       preinstr variable that together specify an instruction that
+    *       performs, for example, "%ecx = op %edx".
+    *
+    * For: int-to-byte, int-to-char, int-to-short, neg-float, neg-int, not-int
+    *
+    * Description: Perform the identified unary operation on the source
+    *              register, storing the result in the destination register
+    *
+    * Format: B|A|op (12x)
+    *
+    * Syntax: op vA, vB
+    */
+
+%default {"preinstr":"", "instr":""}
+
+    movl        rINST, %ecx             # %ecx<- BA+
+    shr         $$4, %ecx               # %ecx<- B
+    and         $$15, rINST             # rINST<- A
+    FFETCH_ADV  1, %eax                 # %eax<- next instruction hi; fetch, advance
+    GET_VREG    %ecx                    # %ecx<- vB
+    $preinstr                           # do operation part 1
+    $instr                              # do operation part 2
+    SET_VREG    %ecx, rINST             # vA<- result
+    FGETOP_JMP  1, %eax                 # jump to next instruction; getop, jmp