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From: "stefansf at linux dot ibm.com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/107088] [13 Regression] cselib ICE building
 __trunctfxf2 on ia64
Date: Thu, 29 Sep 2022 18:33:54 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107088

--- Comment #1 from Stefan Schulze Frielinghaus <stefansf at linux dot ibm.=
com> ---
The patch introduces

scalar_int_mode int_mode;
if (REG_P (x) && is_int_mode (mode, &int_mode)
    && REG_VALUES (REGNO (x)) !=3D NULL
    && (!cselib_current_insn || !DEBUG_INSN_P (cselib_current_insn)))
  {
    rtx copy =3D shallow_copy_rtx (x);
    scalar_int_mode narrow_mode_iter;
    FOR_EACH_MODE_UNTIL (narrow_mode_iter, int_mode)   // <--------
      {
        PUT_MODE_RAW (copy, narrow_mode_iter);
        cselib_val *v =3D cselib_lookup (copy, narrow_mode_iter, 0, VOIDmod=
e);
        if (v)
          {
            rtx sub =3D lowpart_subreg (narrow_mode_iter, e->val_rtx, int_m=
ode);
            if (sub)
              new_elt_loc_list (v, sub);
          }
      }
  }

The failing assert is at the for-loop which is supposed to iterate only over
integer modes up to int_mode. I'm not familiar with ia64; is there any mach=
ine
which I could use for debugging?

The failing assert is

gcc_checking_assert (m_mode !=3D E_VOIDmode);

which is triggered by get_known_wider. Would be interesting to see the init=
ial
value of int_mode and if/how FOR_EACH_MODE_UNTIL actually ends up with
E_VOIDmode.=