[Bug tree-optimization/121703] [16 Regression] ubsan: load of value 32695, which is not a valid value for type 'internal_fn' in tree-vectorizer.h

[cvs-commit at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121703

--- Comment #3 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Richard Biener <rgue...@gcc.gnu.org>:

https://gcc.gnu.org/g:0887961f9e0e7ea6b417bfb02787cfdaea41dbe4

commit r16-3797-g0887961f9e0e7ea6b417bfb02787cfdaea41dbe4
Author: Richard Biener <rguent...@suse.de>
Date:   Fri Sep 5 14:47:33 2025 +0200

    tree-optimization/121703 - UBSAN error with moving from uninit data

    The PR reports

    vectorizer.h:276:3: runtime error: load of value 32695, which is not a
valid value for type 'internal_fn'

    which I believe is from

          slp_node->data = new vect_load_store_data (std::move (ls));

    where 'ls' can be partly uninitialized (and that data will be not
    used, but of course the move CTOR doesn't know this).  The following
    tries to fix that by using value-initialization of 'ls'.

            PR tree-optimization/121703
            * tree-vect-stmts.cc (vectorizable_store): Value-initialize ls.
            (vectorizable_load): Likewise.