1 #include<stdio.h>
2 #include<assert.h>
3 
4 int main()
5 {
6     int rd, rs, rt, dsp;
7     int result, resultdsp;
8 
9     rs = 0x12345678;
10     rt = 0x87654321;
11     result    = 0x8BCF1357;
12     resultdsp = 0x01;
13 
14     __asm
15         ("subu.qb %0, %2, %3\n\t"
16          "rddsp   %1\n\t"
17          : "=r"(rd), "=r"(dsp)
18          : "r"(rs), "r"(rt)
19         );
20     dsp = (dsp >> 20) & 0x01;
21     assert(dsp == resultdsp);
22     assert(rd  == result);
23 
24     return 0;
25 }
26