--- /dev/null
+#include "io.h"
+
+int main(void)
+{
+ long long rd, rs, rt;
+ long long result;
+
+ rs = 0xFFFFFFFF;
+ rt = 0x000000FF;
+ result = 0xFFFFFF00;
+ __asm
+ ("modsub %0, %1, %2\n\t"
+ : "=r"(rd)
+ : "r"(rs), "r"(rt)
+ );
+ if (result != rd) {
+ printf("modsub wrong\n");
+
+ return -1;
+ }
+
+ rs = 0x00000000;
+ rt = 0x00CD1FFF;
+ result = 0x0000CD1F;
+ __asm
+ ("modsub %0, %1, %2\n\t"
+ : "=r"(rd)
+ : "r"(rs), "r"(rt)
+ );
+ if (result != rd) {
+ printf("modsub wrong\n");
+
+ return -1;
+ }
+
+ return 0;
+}