Intel® High Level Synthesis Compiler Pro Edition: User Guide

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ID 683456
Date 3/28/2022
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Document Table of Contents
Document Table of Contents x
1. Intel® High Level Synthesis Compiler Pro Edition User Guide 2. Overview of the Intel® High Level Synthesis (HLS) Compiler Pro Edition 3. Creating a High-Level Synthesis Component and Testbench 4. Verifying the Functionality of Your Design 5. Optimizing and Refining Your Component 6. Verifying Your IP with Simulation 7. Synthesize your Component IP with Intel® Quartus® Prime Pro Edition 8. Integrating your IP into a System A. Reviewing the High-Level Design Reports (report.html) B. Intel® HLS Compiler Pro Edition Restrictions C. Intel® HLS Compiler Pro Edition User Guide Archives D. Document Revision History for Intel® HLS Compiler Pro Edition User Guide
2. Overview of the Intel® High Level Synthesis (HLS) Compiler Pro Edition x
2.1. High Level Synthesis Design Flow 2.2. The Project Directory
3. Creating a High-Level Synthesis Component and Testbench x
3.1. Intel® HLS Compiler Pro Edition Compiler-Defined Preprocessor Macros
5. Optimizing and Refining Your Component x
5.1. The High-Level Design Reports
6. Verifying Your IP with Simulation x
6.1. Generation of the Verification Testbench Executable 6.2. Debugging during Verification 6.3. High-Throughput Simulation (Asynchronous Component Calls) Using Enqueue Function Calls
6.3. High-Throughput Simulation (Asynchronous Component Calls) Using Enqueue Function Calls x
6.3.1. Execution Model 6.3.2. Comparison of Explicit and Enqueued Function Calls
8. Integrating your IP into a System x
8.1. Adding the HLS Compiler-Generated IP into an Intel® Quartus® Prime Pro Edition Project 8.2. Adding the HLS Compiler-Generated IP into a Platform Designer System
A. Reviewing the High-Level Design Reports (report.html) x
A.1. Reviewing the Summary Report A.2. Reviewing Component Architecture A.3. Reviewing Factors That Affect Throughput A.4. Reviewing Component Area Usage A.5. Accessing HLD FPGA Reports in JSON Format
A.2. Reviewing Component Architecture x
A.2.1. System Viewer A.2.2. Function Memory Viewer A.2.3. Schedule Viewer (Beta)
A.2.1. System Viewer x
A.2.1.1. Reviewing System Information A.2.1.2. Reviewing Function Information A.2.1.3. Reviewing Block Information A.2.1.4. Reviewing Cluster Information
A.2.1.2. Reviewing Function Information x
A.2.1.2.1. Reviewing Component Interfaces A.2.1.2.2. Reviewing Loops and Blocks in Your Component or Task
A.3. Reviewing Factors That Affect Throughput x
A.3.1. Loop Analysis Report A.3.2. Loops Viewer (Alpha) A.3.3. Verification Statistics Report
1. Intel® High Level Synthesis Compiler Pro Edition User Guide
2. Overview of the Intel® High Level Synthesis (HLS) Compiler Pro Edition
3. Creating a High-Level Synthesis Component and Testbench
4. Verifying the Functionality of Your Design
5. Optimizing and Refining Your Component
6. Verifying Your IP with Simulation
7. Synthesize your Component IP with Intel® Quartus® Prime Pro Edition
8. Integrating your IP into a System
A. Reviewing the High-Level Design Reports (report.html)
B. Intel® HLS Compiler Pro Edition Restrictions
C. Intel® HLS Compiler Pro Edition User Guide Archives
D. Document Revision History for Intel® HLS Compiler Pro Edition User Guide

B. Intel® HLS Compiler Pro Edition Restrictions

When creating your IP using the HLS compiler, be aware of the current set of software and programming restrictions.

C++ Language Restrictions

The Intel® HLS Compiler accepts C++ code.

  • A component cannot include virtual functions, function pointers, or bit fields.
  • Function-scoped static variables that are a part of the component cannot use function arguments for initialization.
  • A component or task function cannot contain an irreducible loop. That is, loops in component and task functions must have only one entry point into the loop.
C++ restrictions
  • The HLS compiler does not support using lambda functions as components.
Class membership
  • HLS component functions cannot be a C++ class member. However, you can declare your component function as a wrapper function. This wrapper function can call a member function of a class or a part of a namespace.
Exception handling
  • A component cannot contain exception handling.
Library calls
  • The HLS compiler does not currently support calls to C++ runtime libraries on Windows, including calls from the testbench code.
Library functions
  • A component cannot contain standard C or C++ library functions, unless they are explicitly supported by header files provided with the Intel® HLS Compiler.
Multiple inheritance
  • The HLS compiler does not support classes with multiple inheritance used as parameters. You may use classes as parameters provided that each class inherits from, at most, one class directly.
Namespaces
  • HLS component functions cannot be a part of a declared namespace. However, you can declare your component function as a global wrapper function. This wrapper function can call a member function of a class or a part of a namespace
Parameters
  • The HLS compiler does not support classes with multiple inheritance used as parameters. You may use classes as parameters if each class inherits from, at most, one class directly.
Recursion
  • The HLS compiler does not support the synthesis of components that use recursion; however, tail recursion is supported.

    If a component has an algorithm that uses recursion, and it is identified for FPGA acceleration, modify the algorithm to use tail recursion, if possible.

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