[Bug target/114222] gcc.c-torture/execute/builtin-bitops-1.c fails for H8/300

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114222

--- Comment #6 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jeff Law <law@gcc.gnu.org>:

https://gcc.gnu.org/g:898f22d15805229a932fff7f22a0a8054e1b9b31

commit r15-7773-g898f22d15805229a932fff7f22a0a8054e1b9b31
Author: Jan Dubiec <jdx@o2.pl>
Date:   Sat Mar 1 08:21:16 2025 -0700

    [PATCH] H8/300, libgcc: PR target/114222 For HImode call internal ffs()
implementation instead of an external one

    When INT_TYPE_SIZE < BITS_PER_WORD gcc emits a call to an external ffs()
    implementation instead of a call to "__builtin_ffs()" â see function
    init_optabs() in <SRCROOT>/gcc/optabs-libfuncs.cc. External ffs()
    (which is usually the one from newlib) in turn calls __builtin_ffs()
    what causes infinite recursion and stack overflow. This patch overrides
    default gcc bahaviour for H8/300H (and newer) and provides a generic
    ffs() implementation for HImode.

            PR target/114222
    gcc/ChangeLog:

            * config/h8300/h8300.cc (h8300_init_libfuncs): For HImode override
            calls to external ffs() (from newlib) with calls to __ffshi2() from
            libgcc. The implementation of ffs() in newlib calls __builtin_ffs()
            what causes infinite recursion and finally a stack overflow.

    libgcc/ChangeLog:

            * config/h8300/t-h8300: Add __ffshi2().
            * config/h8300/ffshi2.c: New file.