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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug bootstrap/97502] [11 Regression] PGO bootstrap failure on
 s390x-linux with -march=z13 starting with r11-3426
Date: Tue, 20 Oct 2020 13:53:32 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97502

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
So the following is problematic:

  vector(16) <signed-boolean:8> _12;
  vector(16) <signed-boolean:8> _14;
  vector(16) <signed-boolean:8> _32;

  _14 =3D vect__1.7_3 !=3D { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0=
 };
  _12 =3D vect__2.10_15 =3D=3D { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, =
0, 0 };
  _32 =3D VEC_COND_EXPR <_12, _14, { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,=
 0, 0,
0 }>;

using a VEC_COND_EXPR to combine two vector bools to another vector bool.
The above could be folded to ~_12 & _14 instead.=