gcc/testsuite/gcc.dg/pr48335-1.c

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

typedef long long T __attribute__((may_alias));

struct S
{
  _Complex float d __attribute__((aligned (8)));
};

void bar (struct S);

void
f1 (T x)
{
  struct S s;
  *(T *) &s.d = x;
  __real__ s.d *= 7.0;
  bar (s);
}

void
f2 (int x)
{
  struct S s = { .d = 0.0f };
  *(char *) &s.d = x;
  __real__ s.d *= 7.0;
  bar (s);
}

void
f3 (int x)
{
  struct S s = { .d = 0.0f };
  ((char *) &s.d)[2] = x;
  __real__ s.d *= 7.0;
  bar (s);
}

void
f4 (int x, int y)
{
  struct S s = { .d = 0.0f };
  ((char *) &s.d)[y] = x;
  __real__ s.d *= 7.0;
  bar (s);
}