Addi, Add immediate – NEC Network Controller uPD98502 User Manual
Page 437
APPENDIX A MIPS III INSTRUCTION SET DETAILS
Preliminary User’s Manual S15543EJ1V0UM
437
ADDI
Add Immediate
ADDI
rs
ADDI
0 0 1 0 0 0
rt
immediate
31
26 25
21 20
16 15
0
6
5
5
16
Format:
ADDI 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. In 64-bit mode, the operand must be valid sign-extended, 32-bit values.
An overflow exception occurs if carries out of bits 30 and 31 differ (2’s complement overflow). The destination
register
rt is not modified when an integer overflow exception occurs.
Operation:
32
T:
GPR [rt]
← GPR [rs] + (immediate
15
)
16
|| immediate
15...0
64
T:
temp
← GPR [rs] + (immediate
15
)
48
|| immediate
15...0
GPR [rt]
← (temp
31
)
32
|| temp
31...0
Exceptions:
Integer overflow exception