Add benchmarks from riscv-tests

bench/multiply.c

@@ -0,0 +1,65 @@
+// *************************************************************************
+// multiply filter bencmark
+// -------------------------------------------------------------------------
+//
+// This benchmark tests the software multiply implemenation.
+
+int input1_multiply[100];
+int input2_multiply[100];
+int results_multiply[100];
+
+void multiply_data_init(int nonce) {
+    int i;
+    int x = nonce;
+    int y = nonce;
+
+    for (i = 0; i < 100; i++) {
+        x = (x * 97 + 17) % 10009;
+        y = (y * 17 + 23) % 10007;
+        input1_multiply[i] = x;
+        input2_multiply[i] = y;
+    }
+}
+
+int multiply(int x, int y) {
+    int i;
+    int result = 0;
+
+    for (i = 0; i < 32; i++) {
+        if ((x & 0x1) == 1)
+            result = result + y;
+
+        x = x >> 1;
+        y = y << 1;
+    }
+
+    return result;
+}
+
+int verify_multiply(int n, int* test) {
+    int i;
+    int result = 0;
+
+    for (i = 0; i < n; i++) {
+        int t0 = input1_multiply[i];
+        int t1 = input2_multiply[i];
+        int v = results_multiply[i];
+        if (t0 * t1 != v)
+            return 1;
+
+        result += v;
+    }
+
+    return result;
+}
+
+int run_multiply(int dummy_0, int nonce) {
+    int i;
+
+    multiply_data_init(nonce);
+    for (i = 0; i < 100; i++) {
+        results_multiply[i] = multiply(input1_multiply[i], input2_multiply[i]);
+    }
+
+    return verify_multiply(100, results_multiply);
+}