--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.target/msp430/operand-modifiers.c	Mon May 25 07:50:57 2020 +0900
@@ -0,0 +1,30 @@
+volatile unsigned long si = 0x89abcdef;
+volatile unsigned long long di = 0xfedcba9876543210;
+
+unsigned int a, b, c, d;
+
+int
+main (void)
+{
+  /* Check that %A and %B extract the low and high words of a 32-bit value,
+     respectively.  */
+  __asm__("mov %A1, %0\n" : "=m" (a) : "m" (si));
+  __asm__("mov %B1, %0\n" : "=m" (b) : "m" (si));
+  if (a != ((unsigned)si)
+      || b != ((unsigned)(si >> 16)))
+    return 1;
+
+  /* Check that %A, %B, %C and %D extract the 1st, 2nd, 3rd and 4th words of a
+     64-bit value, respectively.  */
+  __asm__("mov %A1, %0\n" : "=m" (a) : "m" (di));
+  __asm__("mov %B1, %0\n" : "=m" (b) : "m" (di));
+  __asm__("mov %C1, %0\n" : "=m" (c) : "m" (di));
+  __asm__("mov %D1, %0\n" : "=m" (d) : "m" (di));
+  if (a != ((unsigned)di)
+      || b != ((unsigned)(di >> 16))
+      || c != ((unsigned)(di >> 32))
+      || d != ((unsigned)(di >> 48)))
+    return 1;
+
+  return 0;
+}