Nios II Classic Processor Reference Guide

ID 683620
Date 10/28/2016
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4.6.1.3. Bitswap Custom Instruction

The Nios II processor core offers a bitswap custom instruction to reduce the time spent performing bit reversal operations.

To add the bitswap custom instruction to the Nios II processor in Qsys, select Bitswap under Custom Instruction Modules on the Component Library tab, and click Add.

The bitswap custom instruction reverses a 32-bit value in a single clock cycle. To perform the equivalent operation in software requires many mask and shift operations.

For details about integrating the bitswap custom instruction into your own algorithm, refer to the Nios II Custom Instruction User Guide.