gcc/testsuite/gcc.c-torture/execute/pr78170.c

   1 /* PR tree-optimization/78170.
   2    Check that sign-extended store to a bitfield
   3    doesn't overwrite other fields.  */
   4
   5 int a, b, d;
   6
   7 struct S0
   8 {
   9   int f0;
  10   int f1;
  11   int f2;
  12   int f3;
  13   int f4;
  14   int f5:15;
  15   int f6:17;
  16   int f7:2;
  17   int f8:30;
  18 } c;
  19
  20 void fn1 ()
  21 {
  22   d = b = 1;
  23   for (; b; b = a)
  24     {
  25       struct S0 e = { 0, 0, 0, 0, 0, 0, 1, 0, 1 };
  26       c = e;
  27       c.f6 = -1;
  28     }
  29 }
  30
  31 int main ()
  32 {
  33   fn1 ();
  34   if (c.f7 != 0)
  35     __builtin_abort ();
  36   return 0;
  37 }