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From: "rdapp at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/111337] ICE in gimple-isel.cc for RISC-V port
Date: Fri, 08 Sep 2023 14:55:01 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111337

Robin Dapp <rdapp at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |rdapp at gcc dot gnu.org

--- Comment #1 from Robin Dapp <rdapp at gcc dot gnu.org> ---
This is gcc.dg/pr70252.c BTW.

What happens is that, starting with
      maskdest =3D (vec_cond mask1 1 0) >=3D (vec_cond mask2 1 0)
we fold to
      maskdest =3D mask1 >=3D (vec_cond (mask2 1 0))
and then sink the ">=3D" into the vec_cond so we end up with
      maskdest =3D vec_cond (mask2 ? mask1 : 0),
i.e. a vec_cond with a mask "data mode".

In gimple-isel, when the target does not provide a vcond_mask
implementation for that (which none does) we assert that the mask mode
be MODE_VECTOR_INT.

IMHO this should not happen and we should not sink comparisons (that could =
be
folded to masks) into vec_cond.

I'm preparing a patch that prevents the sinking of comparisons for mask typ=
es.=