diff options
Diffstat (limited to 'rv64cpu/tb')
| -rw-r--r-- | rv64cpu/tb/CMakeLists.txt | 9 | ||||
| -rw-r--r-- | rv64cpu/tb/unit/tb_branch.cc | 100 |
2 files changed, 109 insertions, 0 deletions
diff --git a/rv64cpu/tb/CMakeLists.txt b/rv64cpu/tb/CMakeLists.txt index 42ed2c0..4bafc67 100644 --- a/rv64cpu/tb/CMakeLists.txt +++ b/rv64cpu/tb/CMakeLists.txt @@ -56,6 +56,15 @@ add_verilator_target( INCLUDE_DIRS ${RTL_COMMON_INCLUDES} TB_SOURCES ${CMAKE_CURRENT_SOURCE_DIR}/unit/tb_regfile.cc ) + +add_verilator_target( + NAME tb_branch + TOP_MODULE branch_unit + SOURCES ${RTL_CORE_DIR}/include/rv64_pkg.sv + ${RTL_CORE_DIR}/branch_unit.sv + INCLUDE_DIRS ${RTL_COMMON_INCLUDES} + TB_SOURCES ${CMAKE_CURRENT_SOURCE_DIR}/unit/tb_branch.cc +) # # add_verilator_target( # NAME tb_csr diff --git a/rv64cpu/tb/unit/tb_branch.cc b/rv64cpu/tb/unit/tb_branch.cc new file mode 100644 index 0000000..e47bf98 --- /dev/null +++ b/rv64cpu/tb/unit/tb_branch.cc @@ -0,0 +1,100 @@ +// Richard CPU +// Copyright (C) 2026 Richard Qin +// This program is free software: you can redistribute it and/or modify +// it under the terms of the GNU General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. + +// This program is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. + +// You should have received a copy of the GNU General Public License +// along with this program. If not, see <https://www.gnu.org/licenses/>. + +// File path: tb/unit/tb_branch.cc +// Description: Branch Unit test + +#include <iostream> +#include <iomanip> +#include <cstdint> +#include <cassert> +#include <verilated.h> +#include "Vbranch_unit.h" + +// Enums must match rv64_pkg::branch_op_t +enum BranchOp { + BRANCH_EQ = 0b000, + BRANCH_NE = 0b001, + BRANCH_LT = 0b100, + BRANCH_GE = 0b101, + BRANCH_LTU = 0b110, + BRANCH_GEU = 0b111 +}; + +void test_branch(Vbranch_unit* dut, uint8_t is_branch, uint8_t op, uint64_t a, uint64_t b, uint8_t expected, const char* name) { + dut->is_branch = is_branch; + dut->branch_op = op; + dut->operand_a = a; + dut->operand_b = b; + dut->eval(); + + if (dut->branch_taken == expected) { + std::cout << "\033[32m[PASS] " << name << " | Expected: " << (int)expected << " Got: " << (int)dut->branch_taken << "\033[0m" << std::dec << std::endl; + } else { + std::cout << "\033[31m[FAIL] " << name << " | Expected: " << (int)expected << " Got: " << (int)dut->branch_taken << "\033[0m" << std::endl; + assert(false); + } +} + +int main(int argc, char** argv) { + Verilated::commandArgs(argc, argv); + Vbranch_unit* dut = new Vbranch_unit; + + std::cout << "----------------------------------" << std::endl; + std::cout << " Branch Unit Test" << std::endl; + std::cout << "----------------------------------" << std::endl; + + // --- Not a branch --- + test_branch(dut, 0, BRANCH_EQ, 10, 10, 0, "Not_A_Branch"); + + // --- BEQ / BNE --- + test_branch(dut, 1, BRANCH_EQ, 10, 10, 1, "BEQ_Equal"); + test_branch(dut, 1, BRANCH_EQ, 10, 20, 0, "BEQ_Not_Equal"); + test_branch(dut, 1, BRANCH_NE, 10, 20, 1, "BNE_Not_Equal"); + test_branch(dut, 1, BRANCH_NE, 10, 10, 0, "BNE_Equal"); + + uint64_t minus_one = (uint64_t)-1; // 0xFFFFFFFFFFFFFFFF + uint64_t one = 1; + + // --- BLT / BGE (Signed) --- + // -1 is less than 1 (Signed) + test_branch(dut, 1, BRANCH_LT, minus_one, one, 1, "BLT_Signed_Negative_vs_Positive"); + test_branch(dut, 1, BRANCH_GE, minus_one, one, 0, "BGE_Signed_Negative_vs_Positive"); + + // 1 is greater than -1 (Signed) + test_branch(dut, 1, BRANCH_LT, one, minus_one, 0, "BLT_Signed_Positive_vs_Negative"); + test_branch(dut, 1, BRANCH_GE, one, minus_one, 1, "BGE_Signed_Positive_vs_Negative"); + + // Equal signed + test_branch(dut, 1, BRANCH_LT, minus_one, minus_one, 0, "BLT_Signed_Equal"); + test_branch(dut, 1, BRANCH_GE, minus_one, minus_one, 1, "BGE_Signed_Equal"); + + // --- BLTU / BGEU (Unsigned) --- + // 0xFFFFFFFFFFFFFFFF is NOT less than 1 (Unsigned) + test_branch(dut, 1, BRANCH_LTU, minus_one, one, 0, "BLTU_Unsigned_Max_vs_1"); + // 0xFFFFFFFFFFFFFFFF is greater than or equal to 1 (Unsigned) + test_branch(dut, 1, BRANCH_GEU, minus_one, one, 1, "BGEU_Unsigned_Max_vs_1"); + + // Equal unsigned + test_branch(dut, 1, BRANCH_LTU, minus_one, minus_one, 0, "BLTU_Unsigned_Equal"); + test_branch(dut, 1, BRANCH_GEU, minus_one, minus_one, 1, "BGEU_Unsigned_Equal"); + + std::cout << "----------------------------------" << std::endl; + std::cout << "\033[32mAll tests passed!\033[0m" << std::endl; + std::cout << "----------------------------------" << std::endl; + + delete dut; + return 0; +} |