thj
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Re: HLS with quartus-compile enabled failed using a library created from an RTL module using VHDL-2008
Hello BB, Thank you for your answer. At command line, I can invoke the i++ compiler with the compile flag --quartus-compile. That invokes the quartus synthesis tools (quartus compiler) with the fitter. The outcome of the fitter is important for me to estimate the resource consumption properly. What I did is indeed to start the quartus project manually and changing the VHDL input to the correct version. Then I start the synthesis flow again. Now I investigate if the output is meaningful, because the i++ compile flow is broken, and I fear the quartus compile flow (fitter) optimizes away a lot because of not connected signals in the resulting hardware design. By the way, I have instantiated an HDL object as described in the Intel High Level Synthesis Compiler Pro Edition Reference Manual Chapter 11.4. The reason is to investigate the resource consumption between a version written in HLS compared to one written in VHDL and the effect of the maximum throughput I can get when I insatiate the HDL object within my component function. For me the C++ (HLS, DPC++) features are very interesting, because that enables template metaprogramming as well and could be quite useful to create powerful designs with a minimum of resource consumption on FPGA hardware, too. Best Regards, Thomas1.1KViews0likes0CommentsHLS with quartus-compile enabled failed using a library created from an RTL module using VHDL-2008
I have created a VHDL Entity with IEEE.FIXED_PKG and made a library from it to use it in HLS components. I can emulate the component and do also RTL simulation with it. But when I try to invoke the i++ compiler with --quartus-compile flag, the synthesis fails because in the generated QSF file is not the vhdl-2008 version enabled. The result is it cannot find the IEEE.FIXED_PKG library. It uses the standard vhdl-1993 verison. Is there a way to change to the vhdl-2008 version? Synthesis directive in the VHLD file does not help. Here is the command I use, using Qartus 20.4 Pro and also Quartus 21.2 Pro versions: i++ -march=Arria10 libRTLMod.a --fpga-only -ghdl --quartus-compile -I ./lib -I./hdl test_comp_fpga_qii.o HLS run Quartus compile failed The debug.log files reports this: Error (13785): VHDL Use Clause error at moving_avg.vhd(5): design library "ieee" does not contain primary unit "fixed_pkg" File: ...moving_avg.vhd Line: 5 In the test_comp_fpga_qii/quartus directory is a quartus_compile.qsf file. Here would help setting a global assignment like this: set_global_assignment -name VHDL_INPUT_VERSION VHDL_2008 Is there a way to guide the compiler to add such a line using the appropriate VHDL version?1.2KViews0likes2Comments