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Re: [Qemu-devel] [PATCH v1 14/33] s390x/tcg: Implement VECTOR LOAD MULTI

From: Richard Henderson
Subject: Re: [Qemu-devel] [PATCH v1 14/33] s390x/tcg: Implement VECTOR LOAD MULTIPLE
Date: Wed, 27 Feb 2019 08:02:56 -0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0

On 2/26/19 3:38 AM, David Hildenbrand wrote:
> Also fairly easy to implement. One issue we have is that exceptions will
> result in some vectors already being modified. At least handle it
> consistently per vector by using a temporary vector. Good enough for
> now, add a FIXME.
> Signed-off-by: David Hildenbrand <address@hidden>
> ---
>  target/s390x/insn-data.def      |  2 ++
>  target/s390x/translate_vx.inc.c | 26 ++++++++++++++++++++++++++
>  2 files changed, 28 insertions(+)

I suppose the fixme is good enough.  For the record, I think you could do the
check with just two loads -- the first and last quadword.  After that, none of
the other loads can fault, and you can store everything else into the
destination vectors as you read them.

Also missing for the fixme: MO_ALIGN{,_16}.

Reviewed-by: Richard Henderson <address@hidden>


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