APPENDIX A MIPS III INSTRUCTION SET DETAILS
Preliminary Users Manual S15543EJ1V0UM 537
ORI Or Immediate ORI
rs

ORI

0 0 1 1 0 1 rt immediate

31 26 25 21 20 16 15 0
655 16
Format:
ORI rt, rs, immediate
Description:
The 16-bit
immediate
is zero-extended and combined with the contents of general register
rs
in a bit-wise logical
OR operation. The result is placed into general register
rt
.
Operation:
32 T: GPR [rt] GPR [rs] 31...16 || (immediate or GPR [rs]15...0)
64 T: GPR [rt] GPR [rs] 63...16 || (immediate or GPR [rs]15...0)
Exceptions:
None