--- /dev/null
+
+
+// Integer Instructions
+// --------------------
+//
+// MulAcc is the Multiply Accumulator.
+// This register is mapped on the the HI and LO registers.
+// Upper 32 bits of MulAcc is mapped on to lower 32 bits of HI register.
+// Lower 32 bits of MulAcc is mapped on to lower 32 bits of LO register.
+
+
+:function:::unsigned64:MulAcc:
+{
+ unsigned64 result = U8_4 (HI, LO);
+ return result;
+}
+
+:function:::void:SET_MulAcc:unsigned64 value
+{
+ *AL4_8 (&HI) = VH4_8 (value);
+ *AL4_8 (&LO) = VL4_8 (value);
+}
+
+:function:::signed64:SignedMultiply:signed32 l, signed32 r
+{
+ signed64 result = (signed64) l * (signed64) r;
+ return result;
+}
+
+:function:::unsigned64:UnsignedMultiply:unsigned32 l, unsigned32 r
+{
+ unsigned64 result = (unsigned64) l * (unsigned64) r;
+ return result;
+}
+
+:function:::unsigned64:Low32Bits:unsigned64 value
+{
+ unsigned64 result = (signed64) (signed32) VL4_8 (value);
+ return result;
+}
+
+:function:::unsigned64:High32Bits:unsigned64 value
+{
+ unsigned64 result = (signed64) (signed32) VH4_8 (value);
+ return result;
+}
+
+
+
+// Multiply and Move LO.
+000000,5.RS,5.RT,5.RD,00100,101000::::MUL
+"mul r<RD>, r<RS>, r<RT>"
+*mipsI,mipsII,mipsIII,mipsIV:
+{
+ SET_MulAcc (SD_, 0 + SignedMultiply (SD_, GPR[RS], GPR[RT]));
+ GPR[RD] = Low32Bits (SD_, MulAcc (SD_));
+}
+
+// Unsigned Multiply and Move LO.
+000000,5.RS,5.RT,5.RD,00101,101000::::MULU
+"mulu r<RD>, r<RS>, r<RT>"
+*mipsI,mipsII,mipsIII,mipsIV:
+{
+ SET_MulAcc (SD_, 0 + UnsignedMultiply (SD_, GPR[RS], GPR[RT]));
+ GPR[RD] = Low32Bits (SD_, MulAcc (SD_));
+}
+
+// Multiply and Move HI.
+000000,5.RS,5.RT,5.RD,01100,101000::::MULHI
+"mulhi r<RD>, r<RS>, r<RT>"
+*mipsI,mipsII,mipsIII,mipsIV:
+{
+ SET_MulAcc (SD_, 0 + SignedMultiply (SD_, GPR[RS], GPR[RT]));
+ GPR[RD] = High32Bits (SD_, MulAcc (SD_));
+}
+
+// Unsigned Multiply and Move HI.
+000000,5.RS,5.RT,5.RD,01101,101000::::MULHIU
+"mulhiu r<RD>, r<RS>, r<RT>"
+*mipsI,mipsII,mipsIII,mipsIV:
+{
+ SET_MulAcc (SD_, 0 + UnsignedMultiply (SD_, GPR[RS], GPR[RT]));
+ GPR[RD] = High32Bits (SD_, MulAcc (SD_));
+}
+
+
+// Multiply, Accumulate
+000000,5.RS,5.RT,00000,00000,101000::::MAC
+"mac r<RS>, r<RT>"
+*vr4320:
+{
+ SET_MulAcc (SD_, MulAcc (SD_) + SignedMultiply (SD_, GPR[RS], GPR[RT]));
+}
+
+// D-Multiply, Accumulate
+000000,5.RS,5.RT,00000,00000,101001::::DMAC
+"dmac r<RS>, r<RT>"
+*mipsI,mipsII,mipsIII,mipsIV:
+{
+ LO = MulAcc (SD_) + SignedMultiply (SD_, GPR[RS], GPR[RT]);
+}
+
+// Multiply, Accumulate and Move LO.
+000000,5.RS,5.RT,5.RD,00010,101000::::MACC
+"macc r<RD>, r<RS>, r<RT>"
+*mipsI,mipsII,mipsIII,mipsIV:
+{
+ SET_MulAcc (SD_, MulAcc (SD_) + SignedMultiply (SD_, GPR[RS], GPR[RT]));
+ GPR[RD] = Low32Bits (SD_, MulAcc (SD_));
+}
+
+// Unsigned Multiply, Accumulate and Move LO.
+000000,5.RS,5.RT,5.RD,00011,101000::::MACCU
+"maccu r<RD>, r<RS>, r<RT>"
+*mipsI,mipsII,mipsIII,mipsIV:
+{
+ SET_MulAcc (SD_, MulAcc (SD_) + UnsignedMultiply (SD_, GPR[RS], GPR[RT]));
+ GPR[RD] = Low32Bits (SD_, MulAcc (SD_));
+}
+
+// Multiply, Accumulate and Move HI.
+000000,5.RS,5.RT,5.RD,01010,101000::::MACCHI
+"macchi r<RD>, r<RS>, r<RT>"
+*mipsI,mipsII,mipsIII,mipsIV:
+{
+ SET_MulAcc (SD_, MulAcc (SD_) + SignedMultiply (SD_, GPR[RS], GPR[RT]));
+ GPR[RD] = High32Bits (SD_, MulAcc (SD_));
+}
+
+// Unsigned Multiply, Accumulate and Move HI.
+000000,5.RS,5.RT,5.RD,01011,101000::::MACCHIU
+"macchiu r<RD>, r<RS>, r<RT>"
+*mipsI,mipsII,mipsIII,mipsIV:
+{
+ SET_MulAcc (SD_, MulAcc (SD_) + UnsignedMultiply (SD_, GPR[RS], GPR[RT]));
+ GPR[RD] = High32Bits (SD_, MulAcc (SD_));
+
+}
+