[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Ping: [PATCH 0/4] HVM: produce better binary code
>>> On 04.09.13 at 18:30, Tim Deegan <tim@xxxxxxx> 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. And the obvious benefit of moves is that interleaving them with other code is less of a risk (in terms of breaking CPU-internal bypasses/optimizations) than with pushes and pops. Jan _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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