Srav, Shift right arithmetic variable – NEC Network Controller uPD98502 User Manual
Page 554
APPENDIX A MIPS III INSTRUCTION SET DETAILS
554
Preliminary User’s Manual S15543EJ1V0UM
SRAV
Shift Right Arithmetic Variable
SRAV
rs
SPECIAL
0 0 0 0 0 0
rt
rd
0
0 0 0 0 0
SRAV
0 0 0 1 1 1
31
26 25
21 20
16 15
11 10
6 5
0
6
5
5
5
5
6
Format:
SRAV rd, rt, rs
Description:
The contents of general register
rt are shifted right by the number of bits specified by the low-order five bits of
general register
rs, sign-extending the high-order bits.
The result is placed in register
rd.
In 64-bit mode, the operand must be a valid sign-extended, 32-bit value.
Operation:
32
T:
s
← GPR [rs]
4...0
GPR [rd]
← (GPR [rt]
31
)
s
|| GPR [rt]
31...s
64
T:
s
← GPR [rs]
4...0
temp
← (GPR [rt]
31
)
s
|| GPR [rt]
31...s
GPR [rd]
← (temp
31
)
32
|| temp
Exceptions:
None