Nec Network Controller uPD98502 Manuel d'utilisateur Page 437

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APPENDIX A MIPS III INSTRUCTION SET DETAILS
Preliminary Users 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
655 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 (2s 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
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