Add benchmarks from riscv-tests

bench/median.c

@@ -0,0 +1,70 @@
+//**************************************************************************
+// Median filter bencmark
+//--------------------------------------------------------------------------
+//
+// This benchmark performs a 1D three element median filter.
+
+int input_median[400];
+int results_median[400];
+
+void median_data_init(int nonce) {
+    int i;
+    int x = nonce;
+
+    for (i = 0; i < 400; i++) {
+        x = (x * 97 + 17) % 1000;
+        input_median[i] = x;
+    }
+}
+
+void median(int n, int input[400], int results[400]) {
+    int A, B, C, i;
+
+    // Zero the ends
+    results[0] = 0;
+    results[n - 1] = 0;
+
+    // Do the filter
+    for (i = 1; i < (n - 1); i++) {
+        A = input[i - 1];
+        B = input[i];
+        C = input[i + 1];
+
+        if (A < B) {
+            if (B < C)
+                results[i] = B;
+            else if (C < A)
+                results[i] = A;
+            else
+                results[i] = C;
+        }
+
+        else {
+            if (A < C)
+                results[i] = A;
+            else if (C < B)
+                results[i] = B;
+            else
+                results[i] = C;
+        }
+    }
+}
+
+int verify_median(int n, int* test) {
+    int i;
+    int result = 0;
+
+    for (i = 0; i < n; i++) {
+        int v = test[i];
+        result += v;
+    }
+
+    return result;
+}
+
+int run_median(int dummy_0, int nonce) {
+    median_data_init(nonce);
+    median(400, input_median, results_median);
+
+    return verify_median(400, results_median);
+}