--- /dev/null
+#include<stdio.h>
+#include<assert.h>
+
+int main()
+{
+ int rs, rt, ach, acl;
+ int resulth, resultl;
+
+ ach = 0x05;
+ acl = 0x00BBDDCC;
+ rs = 0x80001234;
+ rt = 0x80004321;
+ resulth = 0x05;
+ resultl = 0x772ff463;
+
+ __asm
+ ("mthi %0, $ac1\n\t"
+ "mtlo %1, $ac1\n\t"
+ "mulsaq_s.w.ph $ac1, %2, %3\n\t"
+ "mfhi %0, $ac1\n\t"
+ "mflo %1, $ac1\n\t"
+ : "+r"(ach), "+r"(acl)
+ : "r"(rs), "r"(rt)
+ );
+ assert(ach == resulth);
+ assert(acl == resultl);
+
+ return 0;
+}