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From: "stefansf at linux dot ibm.com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/102720] [12 regression] gcc.dg/tree-ssa/ldist-strlen-1.c and ldist-strlen-2.c fail after r12-4324
Date: Wed, 13 Oct 2021 10:14:28 +0000	[thread overview]
Message-ID: <bug-102720-4-3ASKIYI6lM@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-102720-4@http.gcc.gnu.org/bugzilla/>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102720

Stefan Schulze Frielinghaus <stefansf at linux dot ibm.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |stefansf at linux dot ibm.com

--- Comment #4 from Stefan Schulze Frielinghaus <stefansf at linux dot ibm.com> ---
typedef __SIZE_TYPE__ size_t;
extern void* malloc (size_t);
extern void* memset (void*, int, size_t);

__attribute__((noinline))
int test (char *s)
{
  int i;
  for (i=0; s[i]; ++i);
  return i;
}

int main (void)
{
  char *p = malloc (1024);
  memset (p, 0xf, 1024);     // removed
  p[1] = 0;                  // removed
  int i = test (p);
  if (i != 1)
    __builtin_abort ();
  return 0;
}

$ gcc -O2 -fdump-tree-dse2-details test.c

In dse2 we then have:

Deleted dead store: MEM[(char *)p_3 + 1B] = 0;
Deleted dead call: memset (p_3, 15, 1024);

prior g:008e7397dad971c03c08fc1b0a4a98fddccaaed8 the store and call is not
removed.

  parent reply	other threads:[~2021-10-13 10:14 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-12 21:45 [Bug testsuite/102720] New: [12 regression] gcc.dg/tree-ssa/ldist-strlen-1.c and ldist-strlen-2.c fail after r12-4234 seurer at gcc dot gnu.org
2021-10-13  2:16 ` [Bug testsuite/102720] " msebor at gcc dot gnu.org
2021-10-13  7:37 ` rguenth at gcc dot gnu.org
2021-10-13  7:38 ` [Bug tree-optimization/102720] [12 regression] gcc.dg/tree-ssa/ldist-strlen-1.c and ldist-strlen-2.c fail after r12-4324 rguenth at gcc dot gnu.org
2021-10-13 10:14 ` stefansf at linux dot ibm.com [this message]
2021-10-13 14:50 ` clyon at gcc dot gnu.org
2021-10-13 14:52 ` clyon at gcc dot gnu.org
2021-10-15 11:36 ` [Bug ipa/102720] " hubicka at gcc dot gnu.org
2021-10-15 12:21 ` hubicka at gcc dot gnu.org
2021-10-15 13:26 ` hubicka at gcc dot gnu.org
2021-10-15 13:28 ` hubicka at gcc dot gnu.org
2021-10-15 13:54 ` hubicka at gcc dot gnu.org
2021-10-16 12:45 ` [Bug tree-optimization/102720] " cvs-commit at gcc dot gnu.org
2021-11-21 11:57 ` hubicka at gcc dot gnu.org

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