From mboxrd@z Thu Jan  1 00:00:00 1970
From: Anthony Liguori <anthony-rdkfGonbjUSkNkDKm+mE6A@public.gmane.org>
Subject: Re: [PATCH 03/18] KVM: PPC: Teach MMIO Signedness
Date: Sun, 07 Feb 2010 16:13:17 -0600
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Cc: Avi Kivity <avi-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
	"kvm-ppc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" <kvm-ppc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	"kvm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" <kvm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
To: Alexander Graf <agraf-l3A5Bk7waGM@public.gmane.org>
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On 02/07/2010 03:35 PM, Alexander Graf wrote:
>> It's technically implementation dependent but I don't know of an 
>> implementation that doesn't sign extend.
>
>
> Hrm, would
>
> gpr = (s64)(s32)gpr;
>
> work? :)

Yes.  Integer promotion does guarantee sign extension.

Regards,

Anthony Liguori

>
> Alex