--- /dev/null
+#include<stdio.h>
+#include<assert.h>
+
+
+int main()
+{
+ int rd, rs, rt;
+ int result;
+
+ rt = 0x10017EFD;
+ rs = 0x11111111;
+ result = 0x2112900e;
+
+ __asm
+ ("addq_s.w %0, %1, %2\n\t"
+ : "=r"(rd)
+ : "r"(rs), "r"(rt)
+ );
+ assert(rd == result);
+
+ rt = 0x80017EFD;
+ rs = 0x81111111;
+ result = 0x80000000;
+
+ __asm
+ ("addq_s.w %0, %1, %2\n\t"
+ : "=r"(rd)
+ : "r"(rs), "r"(rt)
+ );
+ assert(rd == result);
+
+ rt = 0x7fffffff;
+ rs = 0x01111111;
+ result = 0x7fffffff;
+
+ __asm
+ ("addq_s.w %0, %1, %2\n\t"
+ : "=r"(rd)
+ : "r"(rs), "r"(rt)
+ );
+ assert(rd == result);
+
+ return 0;
+}