
APPENDIX A MIPS III INSTRUCTION SET DETAILS
Preliminary User’s Manual S15543EJ1V0UM
439
ADDU
Add Unsigned
ADDU
rs
SPECIAL
0 0 0 0 0 0
rt rd
0
0 0 0 0 0
ADDU
1 0 0 0 0 1
31 26 25 21 20 16 15 11 10 6 5 0
6 5555 6
Format:
ADDU 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 integer overflow exception occurs under any circumstances. In 64-bit mode,
the operands must be valid sign-extended, 32-bit values.
The only difference between this instruction and the ADD instruction is that ADDU never causes an integer
overflow exception.
Operation:
32 T:
GPR [rd] ← GPR [
rs] + GPR [rt]
64 T:
temp ← GPR [
rs] + GPR [rt]
GPR [rd] ← (temp
31
)
32
|| temp
31...0
Exceptions:
None
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