[Bug middle-end/123869] Negation of _Float16 should just flip the bit and not promote to _Float32

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123869

--- Comment #12 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The trunk branch has been updated by Andrew Pinski <pinskia@gcc.gnu.org>:

https://gcc.gnu.org/g:41f293e72c253301f71fefc5a5e1040cb468e4ed

commit r16-7160-g41f293e72c253301f71fefc5a5e1040cb468e4ed
Author: Andrew Pinski <andrew.pinski@oss.qualcomm.com>
Date:   Wed Jan 28 16:50:52 2026 -0800

    optabs: Fix expansion of abs and neg for Float16 [PR123869]

    The problem here is we try to use the widening type before
    doing the bitwise expansion of neg/and for floating point types.
    This moves the code around to try the bitwise expansion first.

    Note this mostly matters for NaNs where you widening (promotion)
    would cause a NaN to be slightly different when doing the rounding
    back.

    Bootstrapped and tested on x86_64-linux-gnu.

            PR middle-end/123869

    gcc/ChangeLog:

            * optabs.cc (expand_unop): Move the NEG optab
            handling before the widening code.
            Move the ABS bitwise expansion from expand_abs_nojump
            to before the widening code.
            (expand_abs_nojump): Remove the bitwise expansion trial
            since expand_unop is called right above.

    Signed-off-by: Andrew Pinski <andrew.pinski@oss.qualcomm.com>