--- /dev/null
+#include "io.h"
+
+int main(void)
+{
+ long long achi, acli;
+ long long acho, aclo;
+ long long reshi, reslo;
+
+ achi = 0x87654321;
+ acli = 0x12345678;
+
+ reshi = 0xfffffffff8765432;
+ reslo = 0x1234567;
+
+ __asm
+ ("mthi %2, $ac1\n\t"
+ "mtlo %3, $ac1\n\t"
+ "dshilo $ac1, 0x4\n\t"
+ "mfhi %0, $ac1\n\t"
+ "mflo %1, $ac1\n\t"
+ : "=r"(acho), "=r"(aclo)
+ : "r"(achi), "r"(acli)
+ );
+
+ if ((acho != reshi) || (aclo != reslo)) {
+ printf("1 dshilo error\n");
+ return -1;
+ }
+
+ achi = 0x87654321;
+ acli = 0x12345678;
+
+ reshi = 0x1234567;
+ reslo = 0x00;
+
+ __asm
+ ("mthi %2, $ac1\n\t"
+ "mtlo %3, $ac1\n\t"
+ "dshilo $ac1, -60\n\t"
+ "mfhi %0, $ac1\n\t"
+ "mflo %1, $ac1\n\t"
+ : "=r"(acho), "=r"(aclo)
+ : "r"(achi), "r"(acli)
+ );
+
+ if ((acho != reshi) || (aclo != reslo)) {
+ printf("2 dshilo error\n");
+ return -1;
+ }
+
+ return 0;
+}