The testcase files

[VivianDa]

I have sucessfully run the verification tests.
When viewing the UVM testbench for verification of the Ibex core, I know that the complete test list can be found in the file dv/uvm/core_ibex/riscv_dv_extension/testlist.yaml. And as the information I get, testbench use RISCV-DV to generate binaries from system verilog.
But I'm wondering where is the testcase files? for example riscv_arithmetic_basic_test?

[Rupert Swarbrick]

Hi there, and thanks for the question.

Many of the tests work in essentially the same way:

• We generate a constrained random program using riscv-dv.
• We execute the program with an instruction set simulator (Spike), spitting out a log of the instructions and state changes.
• We execute the program in an RTL simulation, spitting out equivalent logs.
• We compare the logs from the two executions and check that they match.

Some specific tests / configurations are defined in testlist.yaml. For example, it contains:

- test: riscv_arithmetic_basic_test
  description: >
    Arithmetic instruction test, no load/store/branch instructions
  gen_opts: >
    +instr_cnt=10000
    +num_of_sub_program=0
    +no_fence=1
    +no_data_page=1
    +no_branch_jump=1
    +boot_mode=m
  iterations: 10
  gen_test: riscv_instr_base_test
  rtl_test: core_ibex_base_test

There are some more details about how this all works in the manual. See the file verification.rst. You can find it rendered online here: https://ibex-core.readthedocs.io/en/latest/03_reference/verification.html

[VivianDa]

May i say that when using make TEST=riscv_arithmetic_basic_test , in riscv-dv is actually using the three uvm files below to generate tmp *.s file then compiled to binary, next to execute ?

inst_overrides = [
        'riscv_asm_program_gen',
        'ibex_asm_program_gen',
        'uvm_test_top.asm_gen'
    ]
   ...

    sim_opts_dict = {
        'uvm_set_inst_override': ','.join(inst_overrides),
        ...
    }

(Code from dv/uvm/core_ibex/scripts/run_instr_gen.py line 156 to 175.)