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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/113907] [14 regression] ICU miscompiled since on x86
 since r14-5109-ga291237b628f41
Date: Tue, 13 Feb 2024 16:30:26 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113907

--- Comment #24 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
static inline int
foo (int len, void *indata, void *outdata)
{
  if (len < 0 || (len & 7) !=3D 0)
    return 0;
  if (len !=3D 0 && indata !=3D outdata)
    __builtin_memcpy (outdata, indata, len);
  return len;
}

static inline int
bar (int len, void *indata, void *outdata)
{
  if (len < 0 || (len & 1) !=3D 0)
    return 0;
  if (len !=3D 0 && indata !=3D outdata)
    __builtin_memcpy (outdata, indata, len);
  return len;
}

int (*volatile p1) (int, void *, void *) =3D foo;
int (*volatile p2) (int, void *, void *) =3D bar;

__attribute__((noipa)) int
baz (int len, void *indata, void *outdata)
{
  if ((len & 6) !=3D 0)
    bar (len, indata, outdata);
  else
    foo (len, indata, outdata);
}

int
main ()
{
  char buf[13] =3D "abcdefghijkl";
  p2 (6, buf, buf + 6);
  if (__builtin_strcmp (buf, "abcdefabcdef"))
    __builtin_abort ();
}

Reproduces the wrong range in bar, but still doesn't crash nor abort.  So I
probably need some different size of the copying.=