1 files changed, 117 insertions, 0 deletions
diff --git a/sim/gentestvec/src/alu.c b/sim/gentestvec/src/alu.c
new file mode 100644
index 0000000..4a11a74
--- /dev/null
+++ b/sim/gentestvec/src/alu.c
@@ -0,0 +1,117 @@
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+
+typedef enum {
+  ADD = 0b0000,
+  SUB = 0b0001,
+  SLT = 0b0010,
+  SLTU = 0b0011,
+
+  AND = 0b0100,
+  OR = 0b0101,
+  XOR = 0b0110,
+
+  SLL = 0b1000,
+  SRL = 0b1001,
+  SRA = 0b1011,
+} OP;
+
+void test_op(OP op, uint32_t a, uint32_t b) {
+  uint32_t result;
+  bool zero;
+
+  switch (op) {
+  case ADD:
+    result = a + b;
+    break;
+  case SUB:
+    result = a - b;
+    break;
+  case SLT:
+    result = (int32_t)a < (int32_t)b;
+    break;
+  case SLTU:
+    result = a < b;
+    break;
+
+  case AND:
+    result = a & b;
+    break;
+  case OR:
+    result = a | b;
+    break;
+  case XOR:
+    result = a ^ b;
+    break;
+
+  case SLL:
+    result = a << b % 32;
+    break;
+  case SRL:
+    result = a >> b % 32;
+    break;
+  case SRA:
+    result = ((int32_t)a) >> b % 32;
+    break;
+  }
+
+  zero = result == 0;
+
+  printf("%01X__%08X_%08X__%08X_%01X\n", op & 0x0f, a, b, result, zero);
+}
+
+void test_op_random(OP op, int num) {
+  for (int i = 0; i < num; ++i) {
+    uint32_t a = (rand() << 16) | rand();
+    uint32_t b = (rand() << 16) | rand();
+    test_op(op, a, b);
+  }
+}
+
+int main(int argc, const char *argv[]) {
+  srand(time(NULL));
+
+  test_op_random(ADD, 1000);
+  test_op(ADD, 0x00000000, 0x00000000);
+  test_op(ADD, 0xffffffff, 0xffffffff);
+  test_op(ADD, 0xffffffff, 0x00000001);
+  test_op_random(SUB, 1000);
+  test_op(SUB, 0xffffffff, 0xffffffff);
+  test_op_random(SLT, 1000);
+  test_op(SLT, 0x8fffffff, 0xffffffff);
+  test_op(SLT, 0xffffffff, 0x00000001);
+  test_op(SLT, 0x00000001, 0xffffffff);
+  test_op_random(SLTU, 1000);
+
+  test_op_random(OR, 1000);
+  test_op(OR, 0x00000000, 0x00000000);
+  test_op(OR, 0xffffffff, 0x00000000);
+  test_op(OR, 0x00000000, 0xffffffff);
+  test_op(OR, 0xffffffff, 0xffffffff);
+  test_op_random(AND, 1000);
+  test_op(AND, 0x00000000, 0x00000000);
+  test_op(AND, 0xffffffff, 0x00000000);
+  test_op(AND, 0x00000000, 0xffffffff);
+  test_op(AND, 0xffffffff, 0xffffffff);
+  test_op_random(XOR, 1000);
+  test_op(XOR, 0x00000000, 0x00000000);
+  test_op(XOR, 0xffffffff, 0x00000000);
+  test_op(XOR, 0x00000000, 0xffffffff);
+  test_op(XOR, 0xffffffff, 0xffffffff);
+
+  test_op_random(SLL, 1000);
+  test_op(SLL, 0x0000000f, 0x00000004);
+  test_op(SLL, 0xffffffff, 0x0000001c);
+  test_op(SLL, 0xf0000000, 0x00000002);
+  test_op(SLL, 0x01234567, 0x00000001);
+  test_op_random(SRL, 1000);
+  test_op(SRL, 0xf0000000, 0x0000001c);
+  test_op(SRL, 0x0000000f, 0x0000004);
+  test_op_random(SRA, 1000);
+  test_op(SRA, 0xf0000000, 0x0000001c);
+  test_op(SRA, 0x0000000f, 0x0000004);
+
+  return 0;
+}