Intel® High Level Synthesis Compiler Pro Edition: Reference Manual

ID 683349
Date 6/26/2023
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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 Mentor Graphics Algorithmic C (AC) Datatypes , which is available In your Intel® HLS Compiler installation as the following file: <quartus_installdir>/hls/include/ref/ac_datatypes_ref.pdf. For more information on AC datatypes, refer to

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.