[Bug tree-optimization/94163] [8/9 Regression] ICE in set_ptr_info_alignment with -O2 and __builtin_assume_aligned

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94163

--- Comment #10 from Martin Liška <marxin at gcc dot gnu.org> ---
commit r10-7158-g3604480a6fe493c51d6ebd53d9b1abeebbbb828f
Author: Richard Biener <rguenther@suse.de>
Date:   Fri Mar 13 13:56:26 2020 +0100

    tree-optimization/94163 constrain alignment set by PRE

    This avoids HWI -> unsigned truncation to end up with zero alignment
    which set_ptr_info_alignment ICEs on.

    2020-03-13  Richard Biener  <rguenther@suse.de>

            PR tree-optimization/94163
            * tree-ssa-pre.c (create_expression_by_pieces): Check
            whether alignment would be zero.