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From: "dcb314 at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/98393] [11 Regression] valgrind error for
 ./gcc.target/m68k/pr52573.c since r11-5928-gfc7b4248172561a9
Date: Sat, 02 Jan 2021 19:35:32 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98393

--- Comment #10 from David Binderman <dcb314 at hotmail dot com> ---
Reduced test case:

typedef struct {
  short a;
  struct {
    unsigned short b;
    unsigned short c
  } d[]
} e;
enum { f, g, h, i };
e j;
char k, l;
e *m;
void n(void) {
  int o;
  char *q, *r =3D 0, *s, *t, *p =3D &k;
  for (; *p; ++p)
    switch (o) {
    case f:
      o =3D s =3D p;
    case g:
      switch (*p) {
      case '@':
        t =3D p;
        o =3D h;
      }
      break;
    case h:
      q =3D p;
    case i:
      if (p =3D=3D '#')
        r =3D p;
    }
  j.d[0].b =3D q - &k;
  j.d[0].c =3D r - q;
  if (s) {
    j.d[0].b =3D s - &k;
    j.d[0].c =3D t - s;
  }
  if (m)
    j.d[0].b =3D j.d[0].c =3D l;
}=