[Bug target/114981] [avr] Improve powi implementation

["cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114981

--- Comment #4 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-14 branch has been updated by Georg-Johann Lay
<gjl@gcc.gnu.org>:

https://gcc.gnu.org/g:a9e313ed38775b3ffee650d5396419ce3e6ea389

commit r14-10186-ga9e313ed38775b3ffee650d5396419ce3e6ea389
Author: Georg-Johann Lay <avr@gjlay.de>
Date:   Wed May 8 17:56:05 2024 +0200

    AVR: target/114981 - Support __builtin_powi[l] / __powidf2.

    This supports __powidf2 by means of a double wrapper for already
    existing f7_powi (renamed to __f7_powi by f7-renames.h).
    It tweaks the implementation so that it does not perform trivial
    multiplications with 1.0 any more, but instead uses a move.
    It also fixes the last statement of f7_powi, which was wrong.
    Notice that f7_powi was unused until now.

            PR target/114981
    libgcc/config/avr/libf7/
            * libf7-common.mk (F7_ASM_PARTS): Add D_powi
            * libf7-asm.sx (F7MOD_D_powi_, __powidf2): New module and function.
            * libf7.c (f7_powi): Fix last (wrong) statement.
            Tweak trivial multiplications with 1.0.

    gcc/testsuite/
            * gcc.target/avr/pr114981-powil.c: New test.

    (cherry picked from commit de4eea7d7ea86e54843507c68d6672eca9d8c7bb)