Altera Nios II User Manual page 192

8–12
beq
Operation:
Assembler Syntax:
Example:
Description:
Exceptions:
Instruction Type:
Instruction Fields:
31 30 29 28 27 26 25
A
Nios II Processor Reference Handbook
if (rA == rB)
then PC ← PC + 4 + σ (IMM16)
else PC ← PC + 4
beq rA, rB, label
beq r6, r7, label
If rA == rB, then beq 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 beq. 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
Chapter 8: Instruction Set Reference
Instruction Set Reference
branch if equal
8 7 6 5 4 3 2 1
0x26
February 2014 Altera Corporation
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