Bad Synthesis Report

[losepatience]

Hi. I synthesized the following code with vitis2024.1, and the synthesis report is beyond my comprehension. The "latency" seems too big. Is this a bug of 2024.1? It's OK in 2022.02.

void crop(hls::stream<ap_axiu<192, 1, 1, 1> >& src, hls::stream<ap_axiu<192, 1, 1, 1> >& dst, int rows, int cols) {
// clang-format off
#pragma HLS INTERFACE axis port=src
#pragma HLS INTERFACE axis port=dst
#pragma HLS INTERFACE s_axilite port=rows               
#pragma HLS INTERFACE s_axilite port=cols               
#pragma HLS INTERFACE s_axilite port=return
    // clang-format on

    xf::cv::Mat<XF_8UC3, ROWS, COLS, XF_NPPC8, 3> src_mat(rows, cols);
    //xf::cv::Mat<XF_8UC3, ROWS, COLS, XF_NPPC8> dst_mat(rows, cols);
// clang-format off
#pragma HLS dataflow
    // clang-format on
    xf::cv::AXIvideo2xfMat<192,XF_8UC3, ROWS, COLS, XF_NPPC8, 3>(src, src_mat);
    xf::cv::xfMat2AXIvideo<192,XF_8UC3, ROWS, COLS, XF_NPPC8, 3>(src_mat, dst);

    return;
}

• Performance & Resource Estimates:

  PS: '+' for module; 'o' for loop; '*' for dataflow
  +----------------------------------------------------------------------+------+------+--------------+-----------+-----------+--------------+-----------+----------+---------+----+------------+-----------+-----+
  |                                Modules                               | Issue|      |   Latency    |  Latency  | Iteration |              |    Trip   |          |         |    |            |           |     |
  |                                & Loops                               | Type | Slack|   (cycles)   |    (ns)   |  Latency  |   Interval   |   Count   | Pipelined|  BRAM   | DSP|     FF     |    LUT    | URAM|
  +----------------------------------------------------------------------+------+------+--------------+-----------+-----------+--------------+-----------+----------+---------+----+------------+-----------+-----+
  |+ crop*                                                               |     -|  0.00|  322122559208|  1.611e+12|          -|  322122559208|          -|  dataflow|  11 (4%)|   -|  1374 (~0%)|  1502 (1%)|    -|
  | + Block_entry_split_proc                                             |     -|  3.65|             0|      0.000|          -|             0|          -|        no|        -|   -|    66 (~0%)|   29 (~0%)|    -|
  | + AXIvideo2xfMat_192_16_1200_1920_8_192_s                            |     -|  0.00|  322122559207|  1.611e+12|          -|  322122559207|          -|        no|        -|   -|   488 (~0%)|  544 (~0%)|    -|
  |  + AXIvideo2xfMat_192_16_1200_1920_8_192_Pipeline_loop_start_hunt    |     -|  2.54|             3|     15.000|          -|             3|          -|        no|        -|   -|     4 (~0%)|   38 (~0%)|    -|
  |   o loop_start_hunt                                                  |     -|  3.65|             1|      5.000|          1|             1|          1|       yes|        -|   -|           -|          -|    -|
  |  o loop_row_axi2mat                                                  |     -|  3.65|  322122559200|  1.611e+12|  268435466|             -|       1200|        no|        -|   -|           -|          -|    -|
  |   + AXIvideo2xfMat_192_16_1200_1920_8_192_Pipeline_loop_col_zxi2mat  |     -|  1.37|     268435457|  1.342e+09|          -|     268435457|          -|        no|        -|   -|   226 (~0%)|  193 (~0%)|    -|
  |    o loop_col_zxi2mat                                                |     -|  3.65|     268435455|  1.342e+09|          2|             1|  268435455|       yes|        -|   -|           -|          -|    -|
  |   + AXIvideo2xfMat_192_16_1200_1920_8_192_Pipeline_loop_last_hunt    |     -|  2.54|             3|     15.000|          -|             3|          -|        no|        -|   -|     4 (~0%)|   52 (~0%)|    -|
  |    o loop_last_hunt                                                  |     -|  3.65|             1|      5.000|          1|             1|          1|       yes|        -|   -|           -|          -|    -|
  | + xfMat2AXIvideo_192_16_1200_1920_8_192_s                            |     -|  0.66|  322122552002|  1.611e+12|          -|  322122552002|          -|        no|        -|   -|   146 (~0%)|  399 (~0%)|    -|
  |  o loop_row_mat2axi                                                  |     -|  3.65|  322122552000|  1.611e+12|  268435460|             -|       1200|        no|        -|   -|           -|          -|    -|
  |   + xfMat2AXIvideo_192_16_1200_1920_8_192_Pipeline_loop_col_mat2axi  |     -|  0.93|     268435458|  1.342e+09|          -|     268435458|          -|        no|        -|   -|    35 (~0%)|  183 (~0%)|    -|
  |    o loop_col_mat2axi                                                |     -|  3.65|     268435456|  1.342e+09|          2|             1|  268435455|       yes|        -|   -|           -|          -|    -|
  +----------------------------------------------------------------------+------+------+--------------+-----------+-----------+--------------+-----------+----------+---------+----+------------+-----------+-----+

[losepatience]

    if (cols > COLS)
        cols = COLS;
    if (rows > ROWS)
        rows = COLS;