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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/98366] [11 Regression] wrong-code with memcmp and -m32
Date: Fri, 18 Dec 2020 09:26:58 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98366

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
But
struct S {
  int b;
  int alignment;
  int c : 7;
  int d : 8;
  int e : 17;
} const e[] =3D {{0, 3, '(', 2, 0}};
typedef struct S S;

int memcmp (const void *, const void *, __SIZE_TYPE__);

int
main ()
{
  _Bool b =3D (!memcmp(e, (S[]){{.alignment =3D 3, '(', 2, 0}}, sizeof (S))=
);
  if (!b)
    __builtin_abort ();
}
should be valid because there is no padding but it aborts anyway, I think t=
he
code mishandles bitfields.=