Multiplication

emulator/hart_test.c

@@ -2,6 +2,7 @@
 #include <inttypes.h>
 #include <assert.h>
 #include <stdbool.h>
+#include <stdio.h>
 
 #include "emulator/hart.h"
 
@@ -229,7 +230,42 @@ static void test_branch()
     assert(hart.pc == 124);
 }
 
-void test()
+static void test_m()
+{
+    struct Hart hart = {0};
+
+    hart.regs[1] = 0xFFFFFFFE;
+    hart.regs[2] = 4;
+
+    execute(&hart, 0x022081b3); // mul x3, x1, x2
+    assert(hart.regs[3] == 0xFFFFFFF8);
+
+    execute(&hart, 0x0220b1b3); // mulhu x3, x1, x2
+    assert(hart.regs[3] == 0x00000003);
+
+    execute(&hart, 0x0220a1b3); // mulhsu x3, x1, x2
+    assert(hart.regs[3] == 0xFFFFFFFF);
+
+    execute(&hart, 0x022091b3); // mulh x3, x1, x2
+    assert(hart.regs[3] == 0xFFFFFFFF);
+
+    hart.regs[1] = 0xFFFFFFFE;
+    hart.regs[2] = 0xFFFFFFFE;
+
+    execute(&hart, 0x022081b3); // mul x3, x1, x2
+    assert(hart.regs[3] == 0x00000004);
+
+    execute(&hart, 0x0220b1b3); // mulhu x3, x1, x2
+    assert(hart.regs[3] == 0xFFFFFFFC);
+
+    execute(&hart, 0x0220a1b3); // mulhsu x3, x1, x2
+    assert(hart.regs[3] == 0xFFFFFFFE);
+
+    execute(&hart, 0x022091b3); // mulh x3, x1, x2
+    assert(hart.regs[3] == 0x00000000);
+}
+
+int main(int argc, char* argv[])
 {
     test_addi();
     test_slti_sltiu();
@@ -240,10 +276,6 @@ void test()
     test_jal();
     test_jalr();
     test_branch();
-}
-
-int main(int argc, char* argv[])
-{
-    test();
+    test_m();
     return EXIT_SUCCESS;
 }