[libre-riscv-dev] div/mod algorithm written in python

Luke Kenneth Casson Leighton lkcl at lkcl.net
Sun Jul 7 12:17:13 BST 2019

On Sun, Jul 7, 2019 at 11:24 AM Jacob Lifshay <programmerjake at gmail.com> wrote:
> I refactored core.py into core.py and div_pipe.py.
> I also added tests that demonstrate integer and fractional division:
> test_algorithm.py:test_int_div/test_fract_div
> I added most of the test code for DivPipeCore, but there's a bug
> somewhere (probably in core.py) that makes nmigen generate invalid
> rtlil (yosys complains when trying to load it).


yosys> read_ilang div_pipe_core_bit_width_8_fract_width_4_radix_2.il
1. Executing ILANG frontend.
Input filename: div_pipe_core_bit_width_8_fract_width_4_radix_2.il
ERROR: Found error in internal cell \div_pipe_core_calculate_7.$132
($mux) at kernel/rtlil.cc:717:
  attribute \src "/home/lkcl/src/riscv/nmigen/nmigen/hdl/ir.py:42"
  cell $mux $132
    parameter \WIDTH 24
    connect \Y $129
    connect \S $130
    connect \B \trial_compare_rhs_1
    connect \A 24'000000000000000000000000

definitely one to raise on the yosys bugtracker.

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