Bit Fields
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
A
B
IMM16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
IMM16
0x30
8.5.39. cmpne
Instruction
compare not equal
Operation
if (rA != rB)
then rC ← 1
else rC ← 0
Assembler Syntax
cmpne rC, rA, rB
Example
cmpne r6, r7, r8
Description
If rA != rB, then stores 1 to rC; otherwise stores 0 to rC.
Usage
cmpne
performs the != operation of the C programming
language.
Exceptions
None
Instruction Type
R
Instruction Fields
A
= Register index of operand rA
B
= Register index of operand rB
C
= Register index of operand rC
Bit Fields
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
A
B
C
0x18
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0x18
0
0x3a
8.5.40. cmpnei
Instruction
compare not equal immediate
Operation
if (rA != σ(IMM16))
then rB ← 1
else rB ← 0
Assembler Syntax
cmpnei rB, rA, IMM16
Example
cmpnei r6, r7, 100
Description
Sign-extends the 16-bit immediate value IMM16 to 32 bits
and compares it to the value of rA. If rA != σ(IMM16), then
cmpnei
stores 1 to rB; otherwise stores 0 to rB.
Usage
cmpnei
performs the != operation of the C programming
language.
continued...
8. Instruction Set Reference
NII-PRG | 2018.04.18
Nios II Processor Reference Guide
194
