[Bug middle-end/95528] [10/11 Regression] internal compiler error: in emit_move_insn, at expr.c:3814

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95528

--- Comment #10 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jakub Jelinek <jakub@gcc.gnu.org>:

https://gcc.gnu.org/g:8be374e02761c9d63d2753d71e4bd4874a1577b1

commit r11-1065-g8be374e02761c9d63d2753d71e4bd4874a1577b1
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Mon Jun 8 11:05:10 2020 +0200

    forwprop: Ignore scalar mode vectors in simplify_vector_constructor
[PR95528]

    As mentioned in the PR, the problem is that at least the x86 backend asumes
    that the vec_unpack* and vec_pack* optabs with integral modes are for the
    AVX512-ish vector masks rather than for very small vectors done in GPRs.
    The only other target that seems to have a scalar mode vec_{,un}pack* optab
    is aarch64 as discussed in the PR, so there is also a condition for that.
    All other targets have just vector mode optabs.

    2020-06-08  Jakub Jelinek  <jakub@redhat.com>

            PR target/95528
            * tree-ssa-forwprop.c (simplify_vector_constructor): Don't use
            VEC_UNPACK*_EXPR or VEC_PACK_TRUNC_EXPR with scalar modes unless
the
            type is vector boolean.

            * g++.dg/opt/pr95528.C: New test.