Specifications

Altera Corporation 8–29
October 2007 Nios II Processor Reference Handbook
cmpeq
cmpeq
compare equal
Operation: if (rA == rB)
then rC
←
1
else rC
←
0
Assembler Syntax:
cmpeq rC, rA, rB
Example:
cmpeq r6, r7, r8
Description: If rA == rB, then stores 1 to rC; otherwise, stores 0 to rC.
Usage:
cmpeq performs the == operation of the C programming language. Also, cmpeq can
be used to implement the C logical-negation operator “!”.
cmpeq rC, rA, r0 ; Implements rC = !rA
Instruction Type: R
Instruction Fields: A = Register index of operand rA
B = Register index of operand rB
C = Register index of operand rC
313029282726252423222120191817161514131211109876543210
ABC0x2000x3a