C/C++ Kernels

Vitis Unified Software Platform Documentation: Application Acceleration Development (UG1393)

Document ID
Release Date
2020.2 English

In the Vitis™ core development kit, the kernel code is generally a compute-intensive part of the algorithm and meant to be accelerated on the FPGA. The Vitis core development kit supports the kernel code written in C/C++, OpenCL™ , and also in RTL. This guide mainly focuses on the C kernel coding style.

During the runtime, the C/C++ kernel executable is called through the host code executable.

Important: Because the host code and the kernel code are developed and compiled independently, there could be a name mangling issue if one is written in C and the other in C++. To avoid this issue, wrap the kernel function declaration with the extern "C" linkage in the header file, or wrap the whole function in the kernel code.
extern "C" {
           void kernel_function(int *in, int *out, int size);