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

   1 /* { dg-do run { target ilp32 } } */
   2 /* { dg-options "-O2 -mpreferred-stack-boundary=2 -march=i686 -frename-registers" } */
   3
   4 extern void abort (void) __attribute__((noreturn));
   5
   6 struct wrapper {
   7 union setconflict
   8 {
   9   short a[20];
  10   int b[10];
  11 } a;
  12 };
  13
  14 int
  15 main ()
  16 {
  17   int sum = 0;
  18   {
  19     struct wrapper a;
  20     short *c;
  21     c = a.a.a;
  22     asm ("": "=r" (c):"0" (c));
  23     *c = 0;
  24     asm ("": "=r" (c):"0" (c));
  25     sum += *c;
  26   }
  27   {
  28     struct wrapper a;
  29     int *c;
  30     c = a.a.b;
  31     asm ("": "=r" (c):"0" (c));
  32     *c = 1;
  33     asm ("": "=r" (c):"0" (c));
  34     sum += *c;
  35   }
  36
  37   if (sum != 1)
  38     abort();
  39   return 0;
  40 }
  41