Intel® High Level Synthesis Compiler Standard Edition: Reference Manual

ID 683310
Date 12/18/2019
Document Table of Contents

8.1.1. Important Usage Information on the ac_int Data Type

The ac_int datatype has a large number of API calls that are documented in the ac_int documentation included in the Intel® HLS Compiler installation package. For more information on AC datatypes, refer to Mentor Graphics Algorithmic C (AC) Datatypes, which is available as <quartus_installdir>/hls/include/ref/ac_datatypes_ref.pdf.

The ac_int datatype automatically increases the size of the result of the operation to guarantee that the intermediate operations never overflow. However, the HLS compiler automatically truncates or extends the result to the size of the specified destination container, so ensure that the storage variable for your computation is large enough.

The HLS compiler installation package includes a number of examples in the tutorials. Refer to the tutorials in <quartus_installdir>/hls/example/tutorials/ac_datatypes for some of the recommended practices.