
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 5555 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)
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