gcc/testsuite/gcc.dg/tree-ssa/ssa-dse-16.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -fdump-tree-dse1-details" } */
   3
   4 struct X { struct A { int a[2]; } b[10]; };
   5 void foo (struct X *x, int i)
   6 {
   7   struct A a;
   8  /* Confuse SRA here with using a variable index, otherwise it will mess
   9     with the IL too much.  */
  10   a.a[i] = 3;
  11   a.a[1] = 0;
  12   /* The following store is dead.  */
  13   x->b[i].a[0] = 1;
  14   x->b[i] = a;
  15 }
  16
  17 /* { dg-final { scan-tree-dump "Deleted dead store" "dse1" } } */