--- /dev/null
+#include "io.h"
+
+int main(void)
+{
+ long long rd, rs, rt, result;
+
+ rd = 0x0;
+ rs = 0x246956789ABCDEF0;
+ rt = 0x123456789ABCDEF0;
+ result = 0x091B000000000000;
+
+ __asm("subuh.ob %0, %1, %2\n\t"
+ : "=r"(rd)
+ : "r"(rs), "r"(rt)
+ );
+
+ if (rd != result) {
+ printf("subuh.ob error\n");
+ return -1;
+ }
+
+ return 0;
+}