Nec Network Controller uPD98502 Manuale Utente Pagina 487

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APPENDIX A MIPS III INSTRUCTION SET DETAILS
Preliminary Users 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 5555 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)
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