From mboxrd@z Thu Jan  1 00:00:00 1970
From: Tim Deegan <tim@xen.org>
Subject: Re: Ping: [PATCH 0/4] HVM: produce better binary code
Date: Thu, 5 Sep 2013 08:58:29 +0100
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To: Jan Beulich <JBeulich@suse.com>
Cc: Eddie Dong <eddie.dong@intel.com>, Andrew Cooper <andrew.cooper3@citrix.com>, Jacob Shin <jacob.shin@amd.com>, Jun Nakajima <jun.nakajima@intel.com>, xen-devel <xen-devel@lists.xenproject.org>, Boris Ostrovsky <boris.ostrovsky@oracle.com>, suravee.suthikulpanit@amd.com
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At 08:52 +0100 on 05 Sep (1378371134), Jan Beulich wrote:
> >>> On 04.09.13 at 18:30, Tim Deegan <tim@xen.org> wrote:
> > I'm not certain, on a modern CPU, whether it's better to issue a series
> > of PUSHes or a series of %rsp-relative MOVs and a SUB.
> 
> When I did the push/pop -> mov conversion for the non-HVM code
> I did some measurements, with the result that the sequence of
> moves was never slower but sometimes (usually on older CPUs)
> faster.

Ah, excellent!

Tim.