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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/98849] [11 Regression] ICE in expand_shift_1, at
 expmed.c:2658 since g:7432f255b70811dafaf325d9403
Date: Wed, 27 Jan 2021 11:40:05 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98849

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
int a[1024], b[1024];

void
foo (void)
{
  for (int i =3D 0; i < 1024; i++)
    a[i] =3D b[i] << 3;
}

void
bar (int x)
{
  for (int i =3D 0; i < 1024; i++)
    a[i] =3D b[i] << x;
}

ICEs with -O3 -mcpu=3Diwmmxt too.  Here the vectorizer understands the targ=
et has
vector x vector shift and not vector x scalar, so we get:
  vect_cst__13 =3D { 3, 3 };
...
  vect__2.7_14 =3D vect__1.6_8 << vect_cst__13;
but veclower carelessly undoes that:
  vect__2.7_14 =3D vect__1.6_8 << 3;=