• Joseph Myers's avatar
    target/i386: fix pmovsx/pmovzx in-place operations · c6a56c8e
    Joseph Myers authored
    The SSE4.1 pmovsx* and pmovzx* instructions take packed 1-byte, 2-byte
    or 4-byte inputs and sign-extend or zero-extend them to a wider vector
    output.  The associated helpers for these instructions do the
    extension on each element in turn, starting with the lowest.  If the
    input and output are the same register, this means that all the input
    elements after the first have been overwritten before they are read.
    This patch makes the helpers extend starting with the highest element,
    not the lowest, to avoid such overwriting.  This fixes many GCC test
    failures (161 in the gcc testsuite in my GCC 6-based testing) when
    testing with a default CPU setting enabling those instructions.
    Signed-off-by: 's avatarJoseph Myers <joseph@codesourcery.com>
    
    Message-Id: <alpine.DEB.2.20.1708082018390.23380@digraph.polyomino.org.uk>
    Signed-off-by: 's avatarPaolo Bonzini <pbonzini@redhat.com>
    c6a56c8e
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