The HLS compiler automatically determines the level of pipelining to use for
internal operations. You can use the BIND_OP or BIND_STORAGE pragmas with the -latency option to explicitly specify the number of pipeline
stages and override the number determined by the tool.
RTL synthesis might use the additional pipeline registers to help improve timing issues that might result after place and route. Registers added to the output of the operation typically help improve timing in the output datapath. Registers added to the input of the operation typically help improve timing in both the input datapath and the control logic from the FSM.
You can use the Operator Configuration commands to pipeline all instances of a specific operation used in the design that have the same pipeline depth.