Rewinding Pipelined Loops for Performance - Rewinding Pipelined Loops for Performance - 2026.1 English - UG1399

The PIPELINE pragma has an option called rewind . This option enables overlap of the execution of successive calls to the pipelined loop when this loop is the outermost construct of the top function, or of a dataflow region and the dataflow region is executed multiple times.

The following figure shows the operation when the rewind option is used when pipelining a loop. At the end of the loop iteration count, the loop starts to execute again. While it generally re-executes immediately, a delay is possible and is shown and described in the GUI.

Figure 1. Loop Pipelining with Rewind Option