--- /dev/null
+#include "io.h"
+
+int main(void)
+{
+ long long rd, rs, rt, dsp;
+ long long result, resultdsp;
+
+ rs = 0x12345678;
+ rt = 0x87654321;
+ result = 0x00001357;
+ resultdsp = 0x01;
+
+ __asm
+ ("subu_s.qb %0, %2, %3\n\t"
+ "rddsp %1\n\t"
+ : "=r"(rd), "=r"(dsp)
+ : "r"(rs), "r"(rt)
+ );
+ dsp = (dsp >> 20) & 0x01;
+ if ((dsp != resultdsp) || (rd != result)) {
+ printf("subu_s_qb wrong");
+
+ return -1;
+ }
+
+ return 0;
+}