Flatten Function

Syntax

#pragma HLS function flatten branchless(true|false)

Description

This pragma unrolls all loops and inlines all subfunctions for a given function. If the branchless option is set to true, all branches (e.g., if-else, switch) in the specified function will also be flatten to allow more parallelism between operations, specifically between the operations that are under different-yet-independent conditions.

Parameters

Parameter	Value	Optional	Default	Description
branchless	true|false	Yes	false	true to flatten branch statements

Position

At the beginning of the function definition block.

Examples

int sum(int *a) {
#pragma HLS function flatten branchless(true)
  ...
}

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