On 08/12/2010 09:41 AM, Wei Yongjun wrote:
> +     case 0xc0 ... 0xc1:     /* xadd */
> +             /* Write back the register source. */
> +             write_register_operand(&c->src, c->dst.val, c->dst.bytes);
> +             /* Write back the memory destination with implicit LOCK prefix. 
> */
> +             c->lock_prefix = 1;

It's not a major performance problem, but xadd does _not_ have an
implicit LOCK prefix.

Paolo
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