On Sun, Aug 05, 2012 at 06:03:12PM +0300, Avi Kivity wrote:
> On 07/30/2012 05:38 PM, Gleb Natapov wrote:
> > Optimize "rep ins" by allowing emulator to write back more than one
> > datum at a time. Introduce new operand type OP_MEM_STR which tells
> > writeback() that dst contains pointer to an array that should be written
> > back as opposite to just one data element.
> >
> >
> > if (ctxt->rep_prefix && (ctxt->d & String)) {
> > + unsigned int count;
> > struct read_cache *r = &ctxt->io_read;
> > - register_address_increment(ctxt, &ctxt->regs[VCPU_REGS_RCX], -1);
> > + if ((ctxt->d & SrcMask) == SrcSI)
> > + count = ctxt->src.count;
> > + else
> > + count = ctxt->dst.count;
> > + register_address_increment(ctxt, &ctxt->regs[VCPU_REGS_RCX],
> > + -count);
> >
>
> count is unsigned. Does it sign extend correctly in
> register_address_increment()?
>
I think it sign extent before register_address_increment() when compiler
sees -count. count is in the range 1-1024 here, so there shouldn't be a
problem. By I welcome better suggestions.
--
Gleb.
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