--- /dev/null
+#include "io.h"
+
+int main(void)
+{
+ long long achi, acho;
+ long long result;
+
+ achi = 0x004433;
+ result = 0x004433;
+
+ __asm
+ ("mthi %1, $ac1\n\t"
+ "mfhi %0, $ac1\n\t"
+ : "=r"(acho)
+ : "r"(achi)
+ );
+ if (result != acho) {
+ printf("mfhi wrong\n");
+
+ return -1;
+ }
+
+ return 0;
+}