Encoding:

SPECIAL

000000

rs

rt

0

MULTU

00000

MULTU

011001

6

5

5

5

5

6

Format: 

MULTU rs, rt

SmartMIPS Crypto

Multiply Unsigned Word

Purpose:

Multiply Unsigned Word

To multiply 32-bit unsigned integers

Description: 

(LO, HI) = GPR[rs] × GPR[rt]

The 32-bit word value in GPR rt is multiplied by the 32-bit value in GPR rs, treating both operands as unsigned values, to produce a 64-bit result. The low-order 32-bit word of the result is placed into special register LO, and the high-order 32-bit word is placed into special register HI. The special register ACX is cleared.

No arithmetic exception occurs under any circumstances.

Restrictions:

None

Operation: 

prod = (0 || GPR[rs]31..0) × (0 || GPR[rt]31..0)
LO = sign_extend(prod31..0)
HI = sign_extend(prod63..32)
ACX = 0

Exceptions:

None