gcc/testsuite/gcc.dg/torture/pr57359-2.c

   1 /* { dg-do run } */
   2 /* { dg-additional-options "-fstrict-aliasing" } */
   3
   4 extern void abort();
   5
   6 typedef int A;
   7 typedef float B;
   8
   9 void __attribute__((noipa))
  10 foo(A * p, B *r, long unk, long oh)
  11 {
  12   for (long i = 0; i < unk; ++i) {
  13       *p = 1;
  14       *r = 2;
  15       if (oh & i)
  16         break;
  17       *r = 3;
  18       *p = 4;
  19   }
  20 }
  21
  22 int main(void)
  23 {
  24   union { A x; B f; } u;
  25   foo(&u.x, &u.f, 1, 1);
  26   if (u.x != 4) abort();
  27   foo(&u.x, &u.f, 2, 1);
  28   if (u.f != 2) abort ();
  29   return 0;
  30 }