gcc/testsuite/gcc.dg/pr48335-4.c

   1 /* PR middle-end/48335 */
   2 /* { dg-do compile } */
   3 /* { dg-options "-O2 -fno-tree-sra" } */
   4
   5 typedef short U __attribute__((may_alias, aligned (1)));
   6
   7 struct S
   8 {
   9   double d;
  10 };
  11
  12 void bar (struct S);
  13
  14 void
  15 f1 (int x)
  16 {
  17   struct S s = { .d = 0.0 };
  18   ((U *)((char *) &s.d + 1))[-1] = x;
  19   __real__ s.d *= 7.0;
  20   bar (s);
  21 }
  22
  23 void
  24 f2 (int x)
  25 {
  26   struct S s = { .d = 0.0 };
  27   ((U *)((char *) &s.d + 1))[-2] = x;
  28   __real__ s.d *= 7.0;
  29   bar (s);
  30 }
  31
  32 void
  33 f3 (int x)
  34 {
  35   struct S s = { .d = 0.0 };
  36   ((U *)((char *) &s.d + 1))[5] = x;
  37   __real__ s.d *= 7.0;
  38   bar (s);
  39 }