--- /dev/null
+#include "io.h"
+
+int main(void)
+{
+ long long rt, rs;
+ long long res;
+ rt = 0x1234567887654321;
+ rs = 0xabcd1234abcd8765;
+
+ res = 0x1234567887654321;
+ __asm
+ ("prependd %0, %1, 0x0\n\t"
+ : "=r"(rt)
+ : "r"(rs)
+ );
+
+ if (rt != res) {
+ printf("prependd error\n");
+ return -1;
+ }
+
+ rt = 0x1234567887654321;
+ rs = 0xabcd1234abcd8765;
+
+ res = 0xd876512345678876;
+ __asm
+ ("prependd %0, %1, 0x4\n\t"
+ : "=r"(rt)
+ : "r"(rs)
+ );
+
+ if (rt != res) {
+ printf("prependd error\n");
+ return -1;
+ }
+ return 0;
+}