Nec Network Controller uPD98502 Manual do Utilizador Página 534

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APPENDIX A MIPS III INSTRUCTION SET DETAILS
534
Preliminary Users Manual S15543EJ1V0UM
MULTU
Multiply Unsigned
MULTU
rs
SPECIAL
0 0 0 0 0 0
MULTU
0 1 1 0 0 1
0
0 0 0 0 0 0 0 0 0 0
31 26 25 21 20 6 5 0
65 610
rt
5
16 15
Format:
MULTU rs, rt
Description:
The contents of general register
rs
and the contents of general register
rt
are multiplied, treating both operands as
unsigned values. No overflow exception occurs under any circumstances.
In 64-bit mode, the operands must be valid 32-bit, sign-extended values.
When the operation completes, the low-order word of the double result is loaded into special register
LO
, and the
high-order word of the double result is loaded into special register
HI
.
If either of the two preceding instructions is MFHI or MFLO, the results of these instructions are undefined. Correct
operation requires separating reads of
HI
or
LO
from writes by a minimum of two instructions.
Operation:
32 T-2: LO
undefined
HI
undefined
T-1: LO
undefined
HI
undefined
T: t
(0 || GPR [rs]) * (0 || GPR [rt
])
LO
t
31...0
HI
t
63...32
64 T-2: LO
undefined
HI
undefined
T-1: LO
undefined
HI
undefined
T: t
(0 || GPR [rs]
31...0
) * (0 || GPR [rt]
31...0
)
LO
(t31
)
32
|| t
31...0
HI
(t
63
)
32
|| t
63...32
Exceptions:
None
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