[Bug tree-optimization/115337] wrong code with _BitInt() __builtin_stdc_first_leading_one/__builtin_clzg (with -1 as second arg) at -O2

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115337

--- Comment #9 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jakub Jelinek <ja...@gcc.gnu.org>:

https://gcc.gnu.org/g:181861b072ff1ef650c1a9d0290a4a672b9e747c

commit r15-1013-g181861b072ff1ef650c1a9d0290a4a672b9e747c
Author: Jakub Jelinek <ja...@redhat.com>
Date:   Tue Jun 4 15:52:09 2024 +0200

    fold-const: Handle CTZ like CLZ in tree_call_nonnegative_warnv_p [PR115337]

    I think we can handle CTZ exactly like CLZ in
tree_call_nonnegative_warnv_p.
    Like CLZ, if it is UB at zero, the result range is [0, prec-1] and if it is
    well defined at zero, the second argument provides the value at zero.

    2024-06-04  Jakub Jelinek  <ja...@redhat.com>

            PR tree-optimization/115337
            * fold-const.cc (tree_call_nonnegative_warnv_p): Handle
            CASE_CFN_CTZ like CASE_CFN_CLZ.