On 08/05/2012 06:18 PM, Gleb Natapov wrote:
> 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.
There is actually no problem since the 'inc' parameter is signed.
--
error compiling committee.c: too many arguments to function
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