gcc-4.9/gcc/testsuite/gcc.dg/pr48335-8.c


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/* PR middle-end/48335 */
/* { dg-do compile } */
/* { dg-options "-O2 -fno-tree-sra" } */

typedef short U __attribute__((may_alias, aligned (1)));

struct S
{
  double d;
};

int
f1 (struct S x)
{
  struct S s = x;
  return ((U *)((char *) &s.d + 1))[-1];
}

int
f2 (struct S x)
{
  struct S s = x;
  return ((U *)((char *) &s.d + 1))[-2];
}

int
f3 (struct S x)
{
  struct S s = x;
  return ((U *)((char *) &s.d + 1))[5];
}