Daddu, Doubleword add unsigned – NEC Network Controller uPD98502 User Manual
Page 472
APPENDIX A MIPS III INSTRUCTION SET DETAILS
472
Preliminary User’s Manual S15543EJ1V0UM
DADDU
Doubleword Add Unsigned
DADDU
rs
SPECIAL
0 0 0 0 0 0
rt
rd
0
0 0 0 0 0
DADDU
1 0 1 1 0 1
31
26 25
21 20
16 15
11 10
6 5
0
6
5
5
5
5
6
Format:
DADDU rd, rs, rt
Description:
The contents of general register
rs and the contents of general register rt are added to form the result. The result
is placed into general register
rd.
No overflow exception occurs under any circumstances.
The only difference between this instruction and the DADD instruction is that DADDU never causes an overflow
exception.
Operation:
64
T:
GPR [rd]
← GPR [rs] + GPR [rt]
Exceptions:
Reserved instruction exception (32-bit user mode/supervisor mode)