diff --git a/compiler/utils/arm/assembler_arm.h b/compiler/utils/arm/assembler_arm.h
index 967b191..bb77113 100644
--- a/compiler/utils/arm/assembler_arm.h
+++ b/compiler/utils/arm/assembler_arm.h
@@ -470,6 +470,13 @@
     orr(rd, rn, so, cond, kCcSet);
   }
 
+  virtual void orn(Register rd, Register rn, const ShifterOperand& so,
+                   Condition cond = AL, SetCc set_cc = kCcDontCare) = 0;
+
+  virtual void orns(Register rd, Register rn, const ShifterOperand& so, Condition cond = AL) {
+    orn(rd, rn, so, cond, kCcSet);
+  }
+
   virtual void mov(Register rd, const ShifterOperand& so,
                    Condition cond = AL, SetCc set_cc = kCcDontCare) = 0;
 
diff --git a/compiler/utils/arm/assembler_arm32.cc b/compiler/utils/arm/assembler_arm32.cc
index f7772ae..c6af283 100644
--- a/compiler/utils/arm/assembler_arm32.cc
+++ b/compiler/utils/arm/assembler_arm32.cc
@@ -130,6 +130,15 @@
 }
 
 
+void Arm32Assembler::orn(Register rd ATTRIBUTE_UNUSED,
+                         Register rn ATTRIBUTE_UNUSED,
+                         const ShifterOperand& so ATTRIBUTE_UNUSED,
+                         Condition cond ATTRIBUTE_UNUSED,
+                         SetCc set_cc ATTRIBUTE_UNUSED) {
+  LOG(FATAL) << "orn is not supported on ARM32";
+}
+
+
 void Arm32Assembler::mov(Register rd, const ShifterOperand& so,
                          Condition cond, SetCc set_cc) {
   EmitType01(cond, so.type(), MOV, set_cc, R0, rd, so);
diff --git a/compiler/utils/arm/assembler_arm32.h b/compiler/utils/arm/assembler_arm32.h
index 3407369..d346096 100644
--- a/compiler/utils/arm/assembler_arm32.h
+++ b/compiler/utils/arm/assembler_arm32.h
@@ -74,6 +74,9 @@
   virtual void orr(Register rd, Register rn, const ShifterOperand& so,
                    Condition cond = AL, SetCc set_cc = kCcDontCare) OVERRIDE;
 
+  virtual void orn(Register rd, Register rn, const ShifterOperand& so,
+                   Condition cond = AL, SetCc set_cc = kCcDontCare) OVERRIDE;
+
   virtual void mov(Register rd, const ShifterOperand& so,
                    Condition cond = AL, SetCc set_cc = kCcDontCare) OVERRIDE;
 
diff --git a/compiler/utils/arm/assembler_thumb2.cc b/compiler/utils/arm/assembler_thumb2.cc
index 0f6c4f5..b8c5fd2 100644
--- a/compiler/utils/arm/assembler_thumb2.cc
+++ b/compiler/utils/arm/assembler_thumb2.cc
@@ -410,6 +410,7 @@
     case MOV:
       // TODO: Support less than or equal to 12bits.
       return ArmAssembler::ModifiedImmediate(immediate) != kInvalidModifiedImmediate;
+
     case MVN:
     default:
       return ArmAssembler::ModifiedImmediate(immediate) != kInvalidModifiedImmediate;
@@ -492,6 +493,12 @@
 }
 
 
+void Thumb2Assembler::orn(Register rd, Register rn, const ShifterOperand& so,
+                          Condition cond, SetCc set_cc) {
+  EmitDataProcessing(cond, ORN, set_cc, rn, rd, so);
+}
+
+
 void Thumb2Assembler::mov(Register rd, const ShifterOperand& so,
                           Condition cond, SetCc set_cc) {
   EmitDataProcessing(cond, MOV, set_cc, R0, rd, so);
@@ -1105,6 +1112,7 @@
       rn_is_valid = false;      // There is no Rn for these instructions.
       break;
     case TEQ:
+    case ORN:
       return true;
     case ADD:
     case SUB:
@@ -1222,6 +1230,7 @@
     case MOV: thumb_opcode =  2U /* 0b0010 */; rn = PC; break;
     case BIC: thumb_opcode =  1U /* 0b0001 */; break;
     case MVN: thumb_opcode =  3U /* 0b0011 */; rn = PC; break;
+    case ORN: thumb_opcode =  3U /* 0b0011 */; break;
     default:
       break;
   }
diff --git a/compiler/utils/arm/assembler_thumb2.h b/compiler/utils/arm/assembler_thumb2.h
index a1a8927..584a387 100644
--- a/compiler/utils/arm/assembler_thumb2.h
+++ b/compiler/utils/arm/assembler_thumb2.h
@@ -98,6 +98,9 @@
   virtual void orr(Register rd, Register rn, const ShifterOperand& so,
                    Condition cond = AL, SetCc set_cc = kCcDontCare) OVERRIDE;
 
+  virtual void orn(Register rd, Register rn, const ShifterOperand& so,
+                   Condition cond = AL, SetCc set_cc = kCcDontCare) OVERRIDE;
+
   virtual void mov(Register rd, const ShifterOperand& so,
                    Condition cond = AL, SetCc set_cc = kCcDontCare) OVERRIDE;
 
diff --git a/compiler/utils/arm/constants_arm.h b/compiler/utils/arm/constants_arm.h
index 6b4daed..2060064 100644
--- a/compiler/utils/arm/constants_arm.h
+++ b/compiler/utils/arm/constants_arm.h
@@ -148,7 +148,8 @@
   MOV = 13,  // Move
   BIC = 14,  // Bit Clear
   MVN = 15,  // Move Not
-  kMaxOperand = 16
+  ORN = 16,  // Logical OR NOT.
+  kMaxOperand = 17
 };
 std::ostream& operator<<(std::ostream& os, const Opcode& rhs);