Pipeline Loop

Syntax

#pragma HLS loop pipeline II(<int>)

Description

This pragma enables pipelining for a given loop in the code. Loop pipelining allows a new iteration of the loop to begin before the current one has completed, achieving higher throughput. It can be specified to pipeline a single loop or a nested loop. If specified on a single loop or on a inner loop of a nested loop, that loop will be pipelined. If specified on the outer loop of a nested loop, the outer loop will be pipelined and all of its inner loops will be automatically unrolled.

Parameters

Parameter	Value	Optional	Default	Description
II	Integer	Yes	1	Pipeline initiation interval

Position

Before the beginning of the loop. If there is a loop label, the pragma should be placed after the label.

Examples

#pragma HLS loop pipeline II(2)
for (int i = 0; i < 10; i++) {
  ...
}

LOOP_LABEL:
#pragma HLS loop pipeline
while (i < 10) {
  ...
}

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