testsuite: add testcase for fixed PR106073

  This was fixed by r12-8835-ge8d5f3a1b5a583 which surely made it latent
but richi points out it was likely an instance of PR90348. -fstack-reuse
continues to be a menace, so let's add the testcase.

gcc/testsuite/ChangeLog:
	PR middle-end/90348
	PR tree-optimization/106073

	* gcc.dg/pr106073.c: New test.
---
OK?

 gcc/testsuite/gcc.dg/pr106073.c | 123 ++++++++++++++++++++++++++++++++
 1 file changed, 123 insertions(+)
 create mode 100644 gcc/testsuite/gcc.dg/pr106073.c
  

On Thu, Oct 31, 2024 at 4:39 AM Sam James <sam@gentoo.org> wrote:
>
> This was fixed by r12-8835-ge8d5f3a1b5a583 which surely made it latent
> but richi points out it was likely an instance of PR90348. -fstack-reuse
> continues to be a menace, so let's add the testcase.
>
> gcc/testsuite/ChangeLog:
>         PR middle-end/90348
>         PR tree-optimization/106073
>
>         * gcc.dg/pr106073.c: New test.
> ---
> OK?

OK

>  gcc/testsuite/gcc.dg/pr106073.c | 123 ++++++++++++++++++++++++++++++++
>  1 file changed, 123 insertions(+)
>  create mode 100644 gcc/testsuite/gcc.dg/pr106073.c
>
> diff --git a/gcc/testsuite/gcc.dg/pr106073.c b/gcc/testsuite/gcc.dg/pr106073.c
> new file mode 100644
> index 00000000000..570e68868b2
> --- /dev/null
> +++ b/gcc/testsuite/gcc.dg/pr106073.c
> @@ -0,0 +1,123 @@
> +/* { dg-do run } */
> +/* { dg-options "-O3" } */
> +int a, f = 1, h, l, m = 1, o, r = 4, q, s, x, e, aa, ab, ac, *ad, ae = 5, **y, **af, ag, ah, ai, aj;
> +static int c[6], d, g[6][5], n, *v = &s, ak;
> +volatile int p;
> +const volatile int al;
> +static volatile int t, u, w = 3, z, am, an;
> +static int ao();
> +void ap();
> +static void aq() {
> +  int ar[4] = {6, 6, 6, 6}, as[1], i, j;
> +  as[0] = 0;
> +  if (m) {
> +    int at[11] = {4, 4, 6, 5, 7, 0, 7, 6, 7, 6, 6}, *au, *av[7], k;
> +    au = (int*) &au;
> +    for (i = 0; i < 1; i++)
> +      for (j = 0; j < 1; j++)
> +        for (k = 0; k < 7; k++) {
> +          (t || n) && u;
> +          av[k] = 0;
> +        }
> +    y = av;
> +    while (o) {
> +      int *b[2] = {as, ar};
> +      *af = at;
> +    }
> +    m = 0;
> +  }
> +}
> +inline void ap() {
> +  for (; l <= 4; l++) {
> +    *v = 0;
> +    aq();
> +    if (a)
> +      break;
> +    for (; q; q++)
> +      ;
> +  }
> +}
> +int ao() {
> +  int be = 0, j;
> +  if (n)
> +    aa = d = 0;
> +  l = 0;
> +  for (; be < 2; be++) {
> +    int bf[7][2];
> +    for (ai = 0; ai < 7; ai++)
> +      for (j = 0; j < 2; j++)
> +        bf[ai][j] = 5;
> +    if (be) {
> +      for (; h >= 0; h--) {
> +        while (z >= w) {
> +          ap();
> +          *ad = 0;
> +        }
> +        ap();
> +      }
> +      return bf[3][0];
> +    }
> +    if (bf[3][0])
> +      continue;
> +    while (1)
> +      ;
> +  }
> +  return 0;
> +}
> +static void aw() {
> +  for (; ah; ah++) {
> +    p = 0;
> +    p = 0;
> +  }
> +  int ax = ~e;
> + L1:
> +  e = a = 0;
> + L2:
> +  if (!r)
> +    goto L3;
> +  if (!ax)
> +    goto L2;
> +  if (d)
> +    goto L1;
> +  if (!ae)
> +    goto L1;
> +  if (w && x <= 808 && f)
> +    ag = ao();
> +  g[0][4] = ag;
> +  if (a) {
> +    int bd;
> +    n++;
> +    while (n)
> +      for (bd = 0; bd < 7; bd++) {
> +        am;
> +        am;
> +        am;
> +        am;
> +        d = c[d ^ am];
> +      }
> +  } else {
> +  L3:
> +    an;
> +    for (; ak; ak++) {
> +      int bc = 7;
> +      for (; bc >= 0; bc--) {
> +        al;
> +        al;
> +        d = f && an;
> +        an;
> +      }
> +    }
> +  }
> +}
> +int main() {
> +  int k;
> +  for (; aj < 6; aj++)
> +    c[0] = aj;
> +  aw();
> +  for (aj = 0; aj < 6; aj++)
> +    for (k = 0; k < 5; k++)
> +      d = c[d ^ g[aj][k]];
> +  if (d != 5)
> +    __builtin_abort();
> +  return 0;
> +}
> --
> 2.47.0
>