Dsra, Doubleword shift right arithmetic – NEC Network Controller uPD98502 User Manual
Page 487
APPENDIX A MIPS III INSTRUCTION SET DETAILS
Preliminary User’s Manual S15543EJ1V0UM
487
DSRA
Doubleword Shift Right Arithmetic
DSRA
0
0 0 0 0 0
SPECIAL
0 0 0 0 0 0
rt
rd
sa
DSRA
1 1 1 0 1 1
31
26 25
21 20
16 15
11 10
6 5
0
6
5
5
5
5
6
Format:
DSRA rd, rt, sa
Description:
The contents of general register
rt are shifted right by sa bits, sign-extending the high-order bits. The result is
placed in register
rd.
This operation is defined in 64-bit mode or in 32-bit kernel mode. Execution of this instruction in 32-bit user or
supervisor mode causes a reserved instruction exception.
Operation:
64
T:
s
← 0 || sa
GPR [rd]
← (GPR [rt]
63
)
s
|| GPR [rt]
63..s
Exceptions:
Reserved instruction exception (32-bit user mode/supervisor mode)