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 = 0x80001234;
10     rt = 0x80004321;
11     result = 0x7FFFAAAB;
12 
13     __asm
14         ("mulq_s.w %0, %1, %2\n\t"
15          : "=r"(rd)
16          : "r"(rs), "r"(rt)
17         );
18     assert(rd  == result);
19 
20     rs = 0x80000000;
21     rt = 0x80000000;
22     result = 0x7FFFFFFF;
23     resultdsp = 1;
24 
25     __asm
26         ("mulq_s.w %0, %2, %3\n\t"
27          "rddsp %1\n\t"
28          : "=r"(rd), "=r"(dsp)
29          : "r"(rs), "r"(rt)
30         );
31     dsp = (dsp >> 21) & 0x01;
32     assert(rd  == result);
33     assert(dsp == resultdsp);
34 
35     return 0;
36 }
37