[Bug string/21081] Missing vzeroupper in memset-vec-unaligned-erms.S

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https://sourceware.org/bugzilla/show_bug.cgi?id=21081

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=4d393a8831fc0ab1b7c29e2d5bafbdbfe2102082

commit 4d393a8831fc0ab1b7c29e2d5bafbdbfe2102082
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Mon Jan 30 10:59:15 2017 -0800

    Add VZEROUPPER to memset-vec-unaligned-erms.S [BZ #21081]

    Since memset-vec-unaligned-erms.S has VDUP_TO_VEC0_AND_SET_RETURN at
    function entry, memset optimized for AVX2 and AVX512 will always use
    ymm/zmm register. VZEROUPPER should be placed before ret in

    L(stosb):
            movq    %rdx, %rcx
            movzbl  %sil, %eax
            movq    %rdi, %rdx
            rep stosb
            movq    %rdx, %rax
            ret

    since it can be reached from

    L(stosb_more_2x_vec):
            cmpq    $REP_STOSB_THRESHOLD, %rdx
            ja      L(stosb)

        [BZ #21081]
        * sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S
        (L(stosb)): Add VZEROUPPER before ret.

    (cherry picked from commit 02b78ff749f0c88771713368dbb2a09b1979814f)

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog                                          |    6 ++++++
 .../x86_64/multiarch/memset-vec-unaligned-erms.S   |    2 ++
 2 files changed, 8 insertions(+), 0 deletions(-)

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