[Bug target/101495] Unnecessary vzeroupper

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101495

--- Comment #1 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by H.J. Lu <hjl@gcc.gnu.org>:

https://gcc.gnu.org/g:5586e7e85de381f3df843091494889f8ad8e3e1f

commit r12-2385-g5586e7e85de381f3df843091494889f8ad8e3e1f
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Sun Jul 18 06:12:29 2021 -0700

    x86: Don't issue vzeroupper if callee returns AVX register

    Don't issue vzeroupper before function call if callee returns AVX
    register since callee must be compiled with AVX.

    gcc/

            PR target/101495
            * config/i386/i386.c (ix86_check_avx_upper_stores): Moved before
            ix86_avx_u128_mode_needed.
            (ix86_avx_u128_mode_needed): Return AVX_U128_DIRTY if callee
            returns AVX register.

    gcc/testsuite/

            PR target/101495
            * gcc.target/i386/avx-vzeroupper-28.c: New test.