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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	[thread overview]
Message-ID: <bug-112736-4-LAvpM3qn6G@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-112736-4@http.gcc.gnu.org/bugzilla/>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112736

--- 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 = 2; a >= 0; a--)
    for (e = 0; e < 4; e++)
      c[a][e] = b[a];
}

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

  parent reply	other threads:[~2023-12-11 13:43 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-11-27 22:30 [Bug tree-optimization/112736] New: " kristerw at gcc dot gnu.org
2023-11-27 22:44 ` [Bug tree-optimization/112736] [14 Regression] " pinskia at gcc dot gnu.org
2023-11-28 12:10 ` rguenth at gcc dot gnu.org
2023-12-11 13:43 ` rguenth at gcc dot gnu.org [this message]
2023-12-12 14:26 ` cvs-commit at gcc dot gnu.org
2023-12-12 14:27 ` rguenth at gcc dot gnu.org

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