[Bug tree-optimization/102141] [12 Regression] ICE: with single element vector and the bswap pass at -O2 since r12-3072-gb320edc0c29c838b

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102141

--- Comment #5 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:45ff12512e568089a4c7b85b5322ab8019723cd9

commit r12-3280-g45ff12512e568089a4c7b85b5322ab8019723cd9
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Wed Sep 1 12:06:25 2021 +0200

    bswap: Fix up bswap_view_convert handling [PR102141]

    bswap_view_convert is used twice in spots where gsi_insert_before is the
    right thing, but in the last one it wants to insert preparation stmts
    for the VIEW_CONVERT_EXPR emitted with gsi_insert_after, where at the
    gsi we still need to insert bswap_stmt and maybe mask_stmt whose lhs
    the preparation stmts will use.
    So, this patch adds a BEFORE argument to the function and emits the
    preparation statements before or after depending on that.

    2021-09-01  Jakub Jelinek  <jakub@redhat.com>

            PR tree-optimization/102141
            * gimple-ssa-store-merging.c (bswap_view_convert): Add BEFORE
            argument.  If false, emit stmts after gsi instead of before, and
            with GSI_NEW_STMT.
            (bswap_replace): Adjust callers.  When converting output of bswap,
            emit VIEW_CONVERT prepratation stmts after a copy of gsi instead
            of before it.

            * gcc.dg/pr102141.c: New test.