用HLS实现c++的哈夫曼编码

Question

当我尝试使用Vivado HLS进行合成时，我得到了关于不可合成的type.My项目是关于huffman编码的错误。

@I [HLS-10] Starting code transformations ...
@I [HLS-10] Checking synthesizability ...
@E [SYNCHK-11] huff.c:17: Constant 'temp' has an unsynthesizable type '[13 x %struct.tnode.0.2.4]*' (possible cause(s): structure variable cannot be decomposed due to unsupported type conversion or memory copy operation).
@E [SYNCHK-11] huff.c:21: Constant 'ptemp' has an unsynthesizable type '[13 x %struct.tnode.0.2.4*]*' (possible cause(s): pointer to pointer or global pointer).
@E [SYNCHK-72] huff.c:24: unsupported c/c++ library function 'qsort'.
@E [SYNCHK-41] huff.c:38: unsupported pointer reinterpretation from type '%struct.tnode.0.2.4 = type { %struct.tnode.0.2.4*, %struct.t...' to type 'i8*' on variable 'ptemp'.
@E [SYNCHK-42] huff.c:47: pointer comparison is not supported.
@I [SYNCHK-10] 5 error(s), 0 warning(s).
@E [HLS-70] Synthesizability check failed. 

而且在做C模拟的时候也有一些困难。

    **..
...
@I [APCC-3] Tmp directory is apcc_db
@I [APCC-1] APCC is done.
@I [LIC-101] Checked in feature [VIVADO_HLS]
   Generating csim.exe
@E Simulation failed: SIGSEGV.
@E [SIM-1] CSim failed with errors.
4
    while executing
"source C:/Users/qijun/Desktop/Huff/hls/solution1/csim.tcl"
    invoked from within
"hls::main C:/Users/qijun/Desktop/Huff/hls/solution1/csim.tcl"
    ("uplevel" body line 1)
    invoked from within
"uplevel 1 hls::main {*}$args"
    (procedure "hls_proc" line 5)
    invoked from within
"hls_proc $argv"
@I [LIC-101] Checked in feature [VIVADO_HLS] **

附件包括我的"top函数“的代码。我没有使用HLS工具的经验。有人能帮我解决这个问题吗？我们如何在vivado HLS的top函数中包含数据结构？谢谢

Answer 1

首先，您忘记添加附件或任何代码。

其次，我强烈建议您至少阅读一些Xilinx文档中的Recommended Coding Styles，其中特别说明了某些类型的C构造是不受支持的，比如您在输出中看到的那些构造。

因此，您可能只想重构或重新编码您的霍夫曼的一部分，以满足这些标准。