Altera Nios II User Manual page 201

Chapter 8: Instruction Set Reference
Instruction Set Reference
bne
Operation:
Assembler Syntax:
Example:
Description:
Exceptions:
Instruction Type:
Instruction Fields:
31 30 29 28 27 26 25
A
February 2014 Altera Corporation
if (rA != rB)
then PC ← PC + 4 + σ (IMM16)
else PC ← PC + 4
bne rA, rB, label
bne r6, r7, top_of_loop
If rA != rB, then bne transfers program control to the instruction at label. In the instruction
encoding, the offset given by IMM16 is treated as a signed number of bytes relative to the
instruction immediately following bne. The two least-significant bits of IMM16 are always zero,
because instruction addresses must be word-aligned.
Misaligned destination address
I
A = Register index of operand rA
B = Register index of operand rB
IMM16 = 16-bit signed immediate value
24 23 22 21 20 19 18 17
B
16 15 14 13 12 11 10 9
IMM16
branch if not equal
8 7 6 5 4 3 2 1
0x1e
Nios II Processor Reference Handbook
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