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Re: [Xen-devel] [PATCH] x86: usercopy assembly constraints
| To: | "Keir Fraser" <Keir.Fraser@xxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] [PATCH] x86: usercopy assembly constraints |
| From: | "Jan Beulich" <jbeulich@xxxxxxxxxx> |
| Date: | Wed, 14 Nov 2007 07:37:01 +0000 |
| Cc: | xen-devel@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Tue, 13 Nov 2007 23:36:35 -0800 |
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| In-reply-to: | <C35FB77E.185D0%Keir.Fraser@xxxxxxxxxxxx> |
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| References: | <4739D8A2.76E4.0078.0@xxxxxxxxxx> <C35FB77E.185D0%Keir.Fraser@xxxxxxxxxxxx> |
| Sender: | xen-devel-bounces@xxxxxxxxxxxxxxxxxxx |
>>> Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> 13.11.07 21:20 >>> >On 13/11/07 16:02, "Jan Beulich" <jbeulich@xxxxxxxxxx> wrote: > >> Besides only being correct this way, this helps work around a gcc 4.3 >> issue. >> At the same time, add some white space, re-order the inputs, and remove >> a bogus cast. > >What's the bug? Does some gcc allocate the 4th output parameter into one of >the other used registers (cx,si,di) if we don't use '=&'? No, the effect is an 'impossible constraint' error, so there's not much reason to be afraid I think. But as said, the constraint was wrong. Jan _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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