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Re: [Xen-devel] [PATCH] linux/x86: convert 'cpu' (and a few other) varia
| To: | "Jan Beulich" <jbeulich@xxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] [PATCH] linux/x86: convert 'cpu' (and a few other) variables to unsigned |
| From: | Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx> |
| Date: | Fri, 18 Jan 2008 16:16:57 +0000 |
| Cc: | xen-devel@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Fri, 18 Jan 2008 08:19:28 -0800 |
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Jan Beulich writes ("[Xen-devel] [PATCH] linux/x86: convert 'cpu' (and a few
other) variables to unsigned"):
> .. producing better code for x86-64.
>
> As usual, written and tested on 2.6.24-rc7 and made apply to the 2.6.18
> tree without further testing.
In what way does this produce better code for x86-64 ?
Normally it's IMO best practice to avoid `unsigned' other than for
bitfields, clock arithmetic, and the like, because the behaviour of
unsigned in the presence of subtraction and comparision is often
surprising.
Ian.
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