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

   1 /* { dg-require-effective-target int32plus } */
   2
   3 /* PR tree-optimization/78170.
   4    Check that sign-extended store to a bitfield
   5    doesn't overwrite other fields.  */
   6
   7 int a, b, d;
   8
   9 struct S0
  10 {
  11   int f0;
  12   int f1;
  13   int f2;
  14   int f3;
  15   int f4;
  16   int f5:15;
  17   int f6:17;
  18   int f7:2;
  19   int f8:30;
  20 } c;
  21
  22 void fn1 ()
  23 {
  24   d = b = 1;
  25   for (; b; b = a)
  26     {
  27       struct S0 e = { 0, 0, 0, 0, 0, 0, 1, 0, 1 };
  28       c = e;
  29       c.f6 = -1;
  30     }
  31 }
  32
  33 int main ()
  34 {
  35   fn1 ();
  36   if (c.f7 != 0)
  37     __builtin_abort ();
  38   return 0;
  39 }