Altera Nios II User Manual page 269

Chapter 8: Instruction Set Reference
Instruction Set Reference
sra
Operation:
Assembler Syntax:
Example:
Description:
Usage:
Exceptions:
Instruction Type:
Instruction Fields:
31 30 29 28 27 26 25
A
February 2014 Altera Corporation
rC ← (signed) rA >> ((unsigned) rB
sra rC, rA, rB
sra r6, r7, r8
Shifts rA right by the number of bits specified in rB
the result in rC. Bits 31–5 are ignored.
sra performs the signed >> operation of the C programming language.
None
R
A = Register index of operand rA
B = Register index of operand rB
C = Register index of operand rC
24 23 22 21 20 19 18 17
B C
)
4..0
(duplicating the sign bit), and then stores
4..0
16 15 14 13 12 11 10 9
0x3b
shift right arithmetic
8 7 6 5 4 3 2 1
0 0x3a
Nios II Processor Reference Handbook
8–89
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