[Bug target/101046] ICE: in gen_rtx_CONST_VECTOR, at emit-rtl.c:6031 with -mavx512vbmi -mavx512vl

["cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101046

--- Comment #5 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-11 branch has been updated by Jakub Jelinek
<jakub@gcc.gnu.org>:

https://gcc.gnu.org/g:5ece5ac99e804cccc3d8534d8871eb72e08edb06

commit r11-8594-g5ece5ac99e804cccc3d8534d8871eb72e08edb06
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Tue Jun 15 11:36:47 2021 +0200

    expr: Fix up VEC_PACK_TRUNC_EXPR expansion [PR101046]

    The following testcase ICEs, because we have a mode mismatch.
    VEC_PACK_TRUNC_EXPR's operands have different modes from the result
    (same vector mode size but twice as large element),
    but we were passing non-NULL subtarget with the mode of the result
    to the expansion of its arguments, so the VEC_PERM_EXPR in one of the
    operands which had V8SImode operands and result had V16HImode target.

    Fixed by clearing the subtarget if we are changing mode.

    2021-06-15  Jakub Jelinek  <jakub@redhat.com>

            PR target/101046
            * expr.c (expand_expr_real_2) <case VEC_PACK_FIX_TRUNC_EXPR,
            case VEC_PACK_TRUNC_EXPR>: Clear subtarget when changing mode.

    (cherry picked from commit 008153c8435ca3bf587e11654c31f05c0f99b43a)