• Joseph Myers's avatar
    target/i386: fix packusdw in-place operation · 80e19606
    Joseph Myers authored
    The SSE4.1 packusdw instruction combines source and destination
    vectors of signed 32-bit integers into a single vector of unsigned
    16-bit integers, with unsigned saturation.  When the source and
    destination are the same register, this means each 32-bit element of
    that register is used twice as an input, to produce two of the 16-bit
    output elements, and so if the operation is carried out
    element-by-element in-place, no matter what the order in which it is
    applied to the elements, the first element's operation will overwrite
    some future input.  The helper for packssdw avoids this issue by
    computing the result in a local temporary and copying it to the
    destination at the end; this patch fixes the packusdw helper to do
    likewise.  This fixes three gcc test failures in my GCC 6-based
    testing.
    Signed-off-by: 's avatarJoseph Myers <joseph@codesourcery.com>
    
    Message-Id: <alpine.DEB.2.20.1708100023050.9262@digraph.polyomino.org.uk>
    Signed-off-by: 's avatarPaolo Bonzini <pbonzini@redhat.com>
    80e19606
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