From: Clemens Kolbitsch <clemens.kol@gmx.at>
To: Thiemo Seufer <ths@networkno.de>
Cc: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] softmmu_header: ldb_kernel vs. ldsb_kernel
Date: Tue, 2 Oct 2007 19:06:10 +0200 [thread overview]
Message-ID: <200710021906.11035.clemens.kol@gmx.at> (raw)
In-Reply-To: <20071002165055.GI16772@networkno.de>
> > The only difference I see (that really matters) is how the bytes are
> > copied to the result-pointer (i.e. using movzbl vs. movsbl)... but that's
> > it.
>
> It is a cast. The generic C version for the other architectures makes
> this more obvious.
>
> > If there is some deeper reason behind that - could you please point that
> > out to me? And if there is such a thing, why is it not necessary for
> > storing (e.g. stb_kernel)??
>
> A load (sign-)extends a value to register size, a store doesn't.
>
> That's why you have e.g. in the MIPS instruction set LB, LBU and SB
> but no SBU, it would do the same as SB.
all right .. thanks for the fast answer :-)
prev parent reply other threads:[~2007-10-02 17:06 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20070929150426.3890gmx1@mx069.gmx.net>
2007-10-02 16:15 ` [Qemu-devel] softmmu_header: ldb_kernel vs. ldsb_kernel Clemens Kolbitsch
2007-10-02 16:50 ` Thiemo Seufer
2007-10-02 17:06 ` Clemens Kolbitsch [this message]
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