Support for Cache Discard Instruction (e.g., CDISCARD) in Rocketchip

[arthurchang09]

I would like to ask whether Rocketchip supports a cache discard instruction, such as CDISCARD. I have noticed that there is an implementation of CFLUSH in the project, but I could not find any reference to CDISCARD.

• Is there any implementation of a CDISCARD instruction in Rocketchip?
• If not, is there a specific reason why CDISCARD is not supported or adopted?

Thank you for your help!