Intel High Level Synthesis Compiler: Version 19.2 Release Notes
Intel High Level Synthesis Compiler Version 19.2 Release Notes
The Intel® High Level Synthesis Compiler Release Notes provide late-breaking information about the Intel® High Level Synthesis Compiler Version 19.2.
New Features and Enhancements
-
Added new pipelining controls:
- The disable_loop_pipelining pragma helps you control loop pipelining.
- The hls_disable_component_pipelining attribute helps you control component pipelining.
-
Added support for the following math
functions:
acosh/acoshf asinh/asinhf atanh/atanhf log1pf logb/logbf erf/erff erfc/erfcf tgamma/tgammaf lgamma/lgammaf lgamma_r/lgamma_rf remainder/remainderf remquo/remquof copysign/copysignf nextafter/nextafterf fma/fmaf fpclassify/fpclassifyf (Linux only) isnormal/isnormalf (Linux only) signbit/signbitf (Linux only) isunordered (Linux only) maxmag/maxmagf minmag/minmagf mad/madf rootn/rootnf oclnan/oclnanf fract/fractf isordered/isorderedf
- Intel® HLS Compiler Standard Edition Version 19.2 is not available.
Intel High Level Synthesis Compiler Prerequisites
For detailed instructions about installing Intel® Quartus® Prime software, including system requirements, prerequisites, and licensing requirements, see Intel® FPGA Software Installation and Licensing .
The Intel® HLS Compiler requires the following software in addition to Intel® Quartus® Prime:
C++ Compiler
-
GCC compiler and C++
Libraries version 5.4.0
You must install these libraries manually. See Installing the Intel® HLS Compiler on Linux Systems for instructions.
-
GCC
compiler and C++ Libraries version
4.4.7
These libraries are included in the version of Linux supported by the Intel® HLS Compiler.
- Microsoft Visual Studio 2015 Professional
- Microsoft Visual Studio 2015 Community
- Microsoft Visual Studio 2010 Professional
Mentor Graphics* ModelSim* Software
- ModelSim* - Intel® FPGA Edition
- ModelSim* - Intel® FPGA Starter Edition
On Linux systems, ModelSim* software requires the Red Hat development tools packages. Additionally, any 32-bit versions of ModelSim* software (including those provided with Intel® Quartus® Prime) require additional 32-bit libraries. The commands to install these requirements are provided in Installing the Intel® HLS Compiler on Linux Systems.
For information about all the ModelSim* software versions that the Intel® software supports, refer to the EDA Interface Information section in the Software and Device Support Release Notes for your edition of Intel® Quartus® Prime
Known Issues and Workarounds
This section provides information about known issues that affect the Intel® High Level Synthesis Compiler Version 19.2.
| Description | Workaround |
|---|---|
|
(Windows only) Compiling a design in a directory with a long path name can result in compile failures. |
Compile the design in a directory with a short path name. |
| (Windows only) A long path for your Intel® Quartus® Prime installation directory can prevent you from successfully compiling and running the Intel® HLS Compiler tutorials and example designs. | Move the tutorials and examples to a short path name before trying to run them. |
| When you use the -c command option to have separate compilation and linking stages in your workflow, and if you do not specify the -march option in the linking stage (or specify a different -march option value), your linking stage might fail with or without error messages. | Ensure that you use the same -march option value for both the compilation with the -c command option stage and the linking stage. |
| Applying the hls_merge memory attribute to an array declared within an unrolled or partially unrolled loop creates an unexpectedly wide memory. | Avoid using the hls_merge memory
attribute in unrolled loops. If you need to merge memories in an unrolled loop, explicitly declare an array of struct type. |
| Slave memories cannot be implemented as MLABs. They can be implemented only as M20K blocks. | N/A |
|
In rare cases, the compiler might fail to initialize internal linkage global variables (such static or const global variables) in the generated hardware. This failure can result in functional differences between the generated hardware and x86 emulation results. |
If an internal linkage global variable requires initialization through a function, mark the function as constexpr. If it is not possible to mark the function as constexpr, declare and initialize the global variable inside the component using it. The bit_fill_hex functions of the ac_int.h header are currently not marked as constexpr. If you need to, you can mark the functions as constexpr with the __HLS_CONSTEXPR__ macro. |
Software Issues Resolved
The following issues were corrected or otherwise resolved in the Intel® HLS Compiler Pro Edition Version 19.2.
| Customer Service Request Numbers | ||||||
|---|---|---|---|---|---|---|
| 00387783 | 00402868 | 00422693 | 00428138 | |||
Intel High Level Synthesis Compiler Release Notes Archives
Document Revision History for Intel HLS Compiler Version 19.2 Release Notes
| Document Version | Intel® Quartus® Prime Version | Changes |
|---|---|---|
| 2019.07.01 | 19.2 |
|