gcc/testsuite/gcc.target/i386/pr36753.c

   1 /* { dg-options "-O2" } */
   2 /* { dg-do run } */
   3
   4 #if defined __i386__
   5 #define REG "edi"
   6 #else
   7 #define REG "r14"
   8 #endif
   9
  10 register unsigned long *ds asm(REG);
  11
  12 extern void abort (void);
  13
  14 __attribute__ ((noinline)) void
  15 test (void)
  16 {
  17   *++ds = 31337;
  18 }
  19
  20 int
  21 main ()
  22 {
  23   unsigned long stack[2];
  24   stack[0] = 0;
  25   stack[1] = 0;
  26   ds = stack;
  27   test ();
  28   if (ds != stack + 1 || *ds != 31337)
  29     abort ();
  30   return 0;
  31 }