--- /dev/null
+#include<stdio.h>
+#include<assert.h>
+
+int main()
+{
+ int rs, rt, dsp;
+ int ach = 0, acl = 0;
+ int resulth, resultl, resultdsp;
+
+ rs = 0x800000FF;
+ rt = 0x80000002;
+ resulth = 0x00;
+ resultl = 0x800003FB;
+ resultdsp = 0x01;
+ __asm
+ ("mthi %0, $ac1\n\t"
+ "mtlo %1, $ac1\n\t"
+ "dpaq_s.w.ph $ac1, %3, %4\n\t"
+ "mfhi %0, $ac1\n\t"
+ "mflo %1, $ac1\n\t"
+ "rddsp %2\n\t"
+ : "+r"(ach), "+r"(acl), "=r"(dsp)
+ : "r"(rs), "r"(rt)
+ );
+ dsp = dsp >> 17 & 0x01;
+ assert(dsp == resultdsp);
+ assert(ach == resulth);
+ assert(acl == resultl);
+
+ return 0;
+}