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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/104637] [9/10/11/12 Regression] ICE: maximum number of
 LRA assignment passes is achieved (30) with -Og -fno-forward-propagate -mavx
 since r9-5221-gd8fcab689435a29d
Date: Fri, 25 Feb 2022 13:25:15 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104637

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
If I change the testcase to following (so that it doesn't rely on
__builtin_convertvector), it started ICEing with
r0-122162-gb7aa4e9afcd3da4f09d6f982a663ea2094b1f2cf
typedef short __attribute__((__vector_size__ (64))) U;
typedef unsigned long long __attribute__((__vector_size__ (32))) V;
typedef long double __attribute__((__vector_size__ (64))) F;

int i;
U u;
F f;

void
foo (char a, char b, _Complex char c, V v)
{
  u =3D (U) { u[0] / 0, u[1] / 0, u[2] / 0, u[3] / 0, u[4] / 0, u[5] / 0, u=
[6] /
0, u[7] / 0,
            u[8] / 0, u[0] / 0, u[9] / 0, u[10] / 0, u[11] / 0, u[12] / 0,
u[13] / 0, u[14] / 0, u[15] / 0,
            u[16] / 0, u[17] / 0, u[18] / 0, u[19] / 0, u[20] / 0, u[21] / =
0,
u[22] / 0, u[23] / 0,
            u[24] / 0, u[25] / 0, u[26] / 0, u[27] / 0, u[28] / 0, u[29] / =
0,
u[30] / 0, u[31] / 0 };
  c +=3D i;
  f =3D (F) { v[0], v[1], v[2], v[3] };
  i =3D (char) (__imag__ c + i);
}

In any case, I don't see anything wrong on the GIMPLE side and it isn't cle=
ar
on reloading which insn it is ICEing.=