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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/112736] [14 Regression] vectorizer is
 introducing out of bounds memory access
Date: Mon, 11 Dec 2023 13:43:40 +0000
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X-Bugzilla-Component: tree-optimization
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X-Bugzilla-Keywords: wrong-code
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D112736

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Runtime testcase:

#include <sys/mman.h>
#include <unistd.h>

int a, c[3][5];

void __attribute__((noipa))
fn1 (int * __restrict b)
{
  int e;
  for (a =3D 2; a >=3D 0; a--)
    for (e =3D 0; e < 4; e++)
      c[a][e] =3D b[a];
}

int main()
{
  long pgsz =3D sysconf (_SC_PAGESIZE);
  void *p =3D mmap (NULL, pgsz * 2, PROT_READ|PROT_WRITE,
     MAP_ANONYMOUS|MAP_PRIVATE, 0, 0);
  if (p =3D=3D MAP_FAILED)
    return 0;
  mprotect (p, pgsz, PROT_NONE);
  fn1 (p + pgsz);
  return 0;
}=