gcc/testsuite/gcc.dg/tree-ssa/pr44258.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -fdump-tree-esra-details" } */
   3
   4 struct blah
   5 {
   6   char a[4];
   7 };
   8
   9 struct str
  10 {
  11   struct blah b1;
  12   char x;
  13 };
  14
  15 struct val
  16 {
  17   char y;
  18   struct blah b2;
  19 };
  20
  21 union U
  22 {
  23   struct str str;
  24   struct val val;
  25 };
  26
  27
  28 extern struct blah e_b1, e_b2;
  29 extern union U *e_u;
  30
  31 int foo (int b)
  32 {
  33   union U u;
  34
  35   u.str.b1 = e_b1;
  36   u.val.b2 = e_b2;
  37   u.str.b1.a[3] = 0;
  38
  39   *e_u = u;
  40 }
  41
  42 /* Epiphany has struct alignment/padding that avoids the overlap of
  43    str.b1 and val.b2.  */
  44 /* { dg-final { scan-tree-dump-times "Created a replacement" 0 "esra" { target { ! "epiphany-*-*" } } } } */