APPENDIX A MIPS III INSTRUCTION SET DETAILS
438 Preliminary Users Manual S15543EJ1V0UM
ADDIU Add Immediate Unsi

g

ned ADDIU

rs

ADDIU

0 0 1 0 0 1 rt immediate

31 26 25 21 20 16 15 0
655 16
Format:
ADDIU rt, rs, immediate
Description:
The 16-bit
immediate
is sign-extended and added to the contents of general register
rs
to form the result. The
result is placed into general register
rt.
No integer overflow exception occurs under any circumstances. In 64-bit
mode, the operand must be valid sign-extended, 32-bit values.
The only difference between this instruction and the ADDI instruction is that ADDIU never causes an integer
overflow exception.
Operation:
32 T: GPR
[
rt
]
GPR
[
rs
]
+
(
immediate15
)
16 || immediate15...0
64 T: temp GPR
[
rs
]
+
(
immediate15
)
48 || immediate15...0
GPR
[
rt
]
(
temp31
)
32 || temp31...0
Exceptions:
None