1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
|
// 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_alu.cc
// Description: ALU unit test
#include "Valu.h"
#include <cassert>
#include <cstdint>
#include <iostream>
#include <verilated.h>
enum AluOp {
ALU_ADD = 0,
ALU_SUB = 8,
ALU_SLL = 1,
ALU_SLT = 2,
ALU_SLTU = 3,
ALU_XOR = 4,
ALU_SRL = 5,
ALU_SRA = 13,
ALU_OR = 6,
ALU_AND = 7,
ALU_MUL = 16,
ALU_MULH = 17,
ALU_MULHSU = 18,
ALU_MULHU = 19,
ALU_DIV = 20,
ALU_DIVU = 21,
ALU_REM = 22,
ALU_REMU = 23
};
void test_alu(Valu* alu, uint8_t op, uint64_t rs1, uint64_t rs2, uint64_t expected, const char* test_name) {
alu->alu_op = op;
alu->operand_a = rs1;
alu->operand_b = rs2;
alu->eval();
if (alu->alu_result == expected) {
std::cout << "\033[32m";
std::cout << "[PASS] " << test_name << " | "
<< rs1 << " op " << rs2 << " = " << expected << "\033[0m" << std::endl;
} else {
std::cout << "\033[31m";
std::cerr << "[FAIL] " << test_name << " | "
<< "Expected: " << expected << ", Got: " << alu->alu_result << "\033[0m" << std::endl;
assert(false);
}
}
int main(int argc, char** argv) {
Verilated::commandArgs(argc, argv);
Valu* alu = new Valu;
std::cout << "----------------------------------" << std::endl;
std::cout << " ALU Unit Test" << std::endl;
std::cout << "----------------------------------" << std::endl;
test_alu(alu, ALU_ADD, 100, 50, 150, "ADD_Positive");
test_alu(alu, ALU_SUB, 100, 50, 50, "SUB_Positive");
test_alu(alu, ALU_ADD, (uint64_t)-5, 10, 5, "ADD_Negative");
test_alu(alu, ALU_AND, 0xFF00, 0x0F0F, 0x0F00, "AND_Mask");
test_alu(alu, ALU_XOR, 0xAAAA, 0xFFFF, 0x5555, "XOR_Invert");
test_alu(alu, ALU_SLL, 1, 10, 1024, "SLL_By_10");
uint64_t minus_one = (uint64_t)-1;
uint64_t five = 5;
test_alu(alu, ALU_SLTU, minus_one, five, 0, "SLTU (Unsigned: -1 < 5 is False)");
test_alu(alu, ALU_SLT, minus_one, five, 1, "SLT (Signed: -1 < 5 is True)");
// Missing Basic Operations
test_alu(alu, ALU_OR, 0xAAAA, 0x5555, 0xFFFF, "OR_All_Bits");
test_alu(alu, ALU_SRL, 0xF000000000000000ULL, 4, 0x0F00000000000000ULL, "SRL_By_4");
// Arithmetic Right Shift (SRA)
test_alu(alu, ALU_SRA, 0xF000000000000000ULL, 4, 0xFF00000000000000ULL, "SRA_Negative_By_4");
test_alu(alu, ALU_SRA, 0x7000000000000000ULL, 4, 0x0700000000000000ULL, "SRA_Positive_By_4");
// Shift Edge Cases
test_alu(alu, ALU_SLL, 1, 0, 1, "SLL_By_0");
test_alu(alu, ALU_SLL, 1, 63, 0x8000000000000000ULL, "SLL_By_63");
test_alu(alu, ALU_SRL, 0x8000000000000000ULL, 63, 1, "SRL_By_63");
test_alu(alu, ALU_SRA, 0x8000000000000000ULL, 63, 0xFFFFFFFFFFFFFFFFULL, "SRA_By_63_SignExt");
// All 0 / All 1 Cases
test_alu(alu, ALU_ADD, 0, 0, 0, "ADD_Zero");
test_alu(alu, ALU_ADD, 0xFFFFFFFFFFFFFFFFULL, 1, 0, "ADD_Overflow");
test_alu(alu, ALU_XOR, 0xFFFFFFFFFFFFFFFFULL, 0xFFFFFFFFFFFFFFFFULL, 0, "XOR_Same");
// SLT / SLTU Same Value
test_alu(alu, ALU_SLT, 100, 100, 0, "SLT_Same_Value");
test_alu(alu, ALU_SLTU, 100, 100, 0, "SLTU_Same_Value");
// SLT Edge Cases
test_alu(alu, ALU_SLT, 0x8000000000000000ULL, 0x7FFFFFFFFFFFFFFFULL, 1, "SLT_Min_max");
test_alu(alu, ALU_SLT, 0x7FFFFFFFFFFFFFFFULL, 0x8000000000000000ULL, 0, "SLT_Max_Min");
// M extension
test_alu(alu, ALU_MUL, 7, 6, 42, "MUL_Positive");
test_alu(alu, ALU_MUL, 0xFFFFFFFFFFFFFFFFULL, 2, 0xFFFFFFFFFFFFFFFEULL, "MUL_NegativeLow");
test_alu(alu, ALU_MULH, 0xFFFFFFFFFFFFFFFFULL, 2, 0xFFFFFFFFFFFFFFFFULL, "MULH_Negative");
test_alu(alu, ALU_MULHU, 0xFFFFFFFFFFFFFFFFULL, 2, 1, "MULHU_UnsignedHigh");
test_alu(alu, ALU_DIV, (uint64_t)-21, 4, (uint64_t)-5, "DIV_SignedTruncTowardZero");
test_alu(alu, ALU_DIVU, 21, 4, 5, "DIVU");
test_alu(alu, ALU_REM, (uint64_t)-21, 4, (uint64_t)-1, "REM_Signed");
test_alu(alu, ALU_REMU, 21, 4, 1, "REMU");
test_alu(alu, ALU_DIV, 123, 0, 0xFFFFFFFFFFFFFFFFULL, "DIV_ByZero");
test_alu(alu, ALU_REM, 123, 0, 123, "REM_ByZero");
test_alu(alu, ALU_DIV, 0x8000000000000000ULL, 0xFFFFFFFFFFFFFFFFULL,
0x8000000000000000ULL, "DIV_Overflow");
test_alu(alu, ALU_REM, 0x8000000000000000ULL, 0xFFFFFFFFFFFFFFFFULL, 0, "REM_Overflow");
std::cout << "----------------------------------" << std::endl;
std::cout << "\033[32mAll tests passed!\033[0m" << std::endl;
std::cout << "----------------------------------" << std::endl;
delete alu;
return 0;
}
|
