begin low-level runtime implementation

llrtc/lib/test_udivmod64.c

@@ -0,0 +1,22 @@
+#include <stdio.h>
+#include <stdint.h>
+
+extern uint64_t
+udivmod64(uint64_t dividend, uint64_t divisor, uint64_t *remainder);
+
+int main(int argc, char * argv[]){
+    uint64_t n, d, q, r;
+    if (argc != 3) {
+        printf("invalid argument: %s dividend divisor", argv[0]);
+        return 1;
+    }
+    sscanf(argv[1], "%llu", &n);
+    sscanf(argv[2], "%llu", &d);
+
+    q = udivmod64(n, d, &r);
+
+    printf("%llu\n", q);
+    printf("%llu\n", r);
+
+    return 0;
+}