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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/113408] ICE: in handle_cast, at
 gimple-lower-bitint.cc:1539 at -O with _BitInt()
Date: Tue, 16 Jan 2024 11:19:49 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113408

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Slightly adjusted:
struct A { _BitInt(713) b; } g;
int f;

void
foo (void)
{
  struct A j =3D g;
  if (j.b)
    f =3D 0;
}

The problem is that SRA decides to change:
  j =3D g;
  _1 =3D j.b;
  if (_1 !=3D 0)
to
  j_7 =3D MEM[(struct A *)&g];
  _1 =3D VIEW_CONVERT_EXPR<_BitInt(713)>(j_7);
  if (_1 !=3D 0)
where j_7 has _BitInt(768) type, and handle_cast doesn't seem to handle tha=
t.
So, we need to handle it there, and ideally also tweak SRA so that it keeps=
 the
bitints as is even if they don't have precision in multiple of bytes or wor=
ds
or whatever SRA rounds to.=