gcc/testsuite/gcc.target/i386/pr25654.c

   1 /* { dg-do run } */
   2 /* { dg-require-effective-target ia32 } */
   3 /* { dg-options "-O2 -mpreferred-stack-boundary=2 -march=i686 -frename-registers" } */
   4
   5 extern void abort (void) __attribute__((noreturn));
   6
   7 struct wrapper {
   8 union setconflict
   9 {
  10   short a[20];
  11   int b[10];
  12 } a;
  13 };
  14
  15 int
  16 main ()
  17 {
  18   int sum = 0;
  19   {
  20     struct wrapper a;
  21     short *c;
  22     c = a.a.a;
  23     asm ("": "=r" (c):"0" (c));
  24     *c = 0;
  25     asm ("": "=r" (c):"0" (c));
  26     sum += *c;
  27   }
  28   {
  29     struct wrapper a;
  30     int *c;
  31     c = a.a.b;
  32     asm ("": "=r" (c):"0" (c));
  33     *c = 1;
  34     asm ("": "=r" (c):"0" (c));
  35     sum += *c;
  36   }
  37
  38   if (sum != 1)
  39     abort();
  40   return 0;
  41 }
  42