--- /dev/null
+#include "io.h"
+
+int main(void)
+{
+ long long rd, result;
+ rd = 0;
+ result = 0xFFFFFFFFFFFFFFFF;
+
+ __asm
+ ("repl.ob %0, 0xFF\n\t"
+ : "=r"(rd)
+ );
+
+ if (result != rd) {
+ printf("repl.ob error\n");
+
+ return -1;
+ }
+
+ return 0;
+}