Using Libraries in Vitis HLS - 2022.2 English

Vitis High-Level Synthesis User Guide (UG1399)

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2022.2 English

Vitis HLS Libraries

Vitis HLS provides foundational C libraries allowing common hardware design constructs and functions to be easily modeled in C and synthesized to RTL. The following C libraries are provided with Vitis HLS:

  • Arbitrary Precision Data Types Library: Arbitrary precision data types let your C code use variables with smaller bit-widths than standard C or C++ data types, to enable improved performance and reduced area in hardware.
  • Vitis HLS Math Library: Used to specify standard math operations for synthesis into RTL and implementation on Xilinx devices.
  • HLS Stream Library: For modeling and compiling streaming data structures.

You can use each of the C libraries in your design by including the library header file in your code. These header files are located in the include directory in the Vitis HLS installation area.

Important: The header files for the Vitis HLS C libraries do not have to be in the include path if the design is used in Vitis HLS. The paths to the library header files are automatically added.

Vitis Libraries

In addition, the Vitis accelerated libraries are available for use with Vitis HLS, including common functions of math, statistics, Linear algebra and DSP; and also supporting domain specific applications, like vision and image processing, quantitative finance, database, data analytics, and data compression. Documentation for the libraries can be found at The libraries can be downloaded from

The Vitis™ libraries contain functions and constructs that are optimized for implementation on Xilinx devices. Using these libraries helps to ensure high quality of results (QoR); that the results of synthesis are a high-performance design that optimizes resource usage. Because the libraries are provided in C and C++, you can incorporate the libraries into your top-level function and simulate them to verify the functional correctness before synthesis.

Tip: The Vitis application acceleration libraries are not available for use on the Windows operating system.