diff --git a/src/twopassassembly.c b/src/twopassassembly.c
index 48090b9..97944ab 100644
--- a/src/twopassassembly.c
+++ b/src/twopassassembly.c
@@ -75,6 +75,59 @@ word dpi(a64inst_instruction cI) {
     return out;
 }
 
+word dpr(a64inst_instruction cI) {
+    word out = 0;
+    a64inst_DPRegisterData data = cI.data.DPRegisterData;
+    // sf
+    int sf = data.regType;
+    // bits 27-25
+    out += 5*(2^25);
+    int m = data.DPROpType;
+    int opc = 0;
+    int opr = 0;
+    int rm = 0;
+    int operand = 0;
+    int rn = 0;
+    int rd = 0;
+    // multiply
+    if (m == 1) {
+        //opc = 0;
+        opr = 8;
+        if (data.processOpData.multiplydata.negProd) {
+            operand += 32;
+        }
+        operand += data.processOpData.multiplydata.summand;
+    }
+    // arithmetic and logical
+    else {
+        // shift
+        opr += 2*data.processOpData.arithmLogicData.shiftType;
+        // arithmetic
+        if (data.processOpData.arithmLogicData.type == 1){
+            opr += 8;
+        }
+        // logical
+        else {
+            if (data.processOpData.arithmLogicData.negShiftedSrc2) {
+                opr += 1;
+            }
+        }
+        operand += data.processOpData.arithmLogicData.shiftAmount;
+    }
+    rm += data.src1;
+    rn += data.src2;
+    rd += data.dest;
+    out += sf*(2^31);
+    out += opc * (2^29);
+    out += m* (2^28);
+    out += opr * (2^21);
+    out += rm * (2^16);
+    out += operand * 1024;
+    out += rn * 32;
+    out += rd;
+    return out;
+}
+
 void secondPass(a64inst_instruction instrs[], int numInstrs, st* table){
     //TODO:
     // iterate over instructions again, this time replacing labels
@@ -86,6 +139,9 @@ void secondPass(a64inst_instruction instrs[], int numInstrs, st* table){
             case a64inst_DPIMMEDIATE:
                 dpi(cI);
                 break;
+            case a64inst_DPREGISTER:
+                dpr(cI);
+                break;
             default:
                 break;
         }