On Mon, Aug 17, 2015 at 5:40 PM, Richard Henderson <r...@twiddle.net> wrote: > On 08/17/2015 07:19 AM, Artyom Tarasenko wrote: >> Well, on the other hand, every access goes via helper_check_align. >> There is a comment /* XXX remove alignment check */. >> I wonder how this can be done in a more efficient way? > > Not ever access does so. There are only 3 memory related calls to > check_align. > The other three are for indirect branches.
Yes, but I think it's the 3 most used ones. > For the 8 byte memory operations we can just remove the checks. There, the > softmmu operation checks the alignment. This is a good news. Where does it happen? > For usermode, we've typically ignored > the guest alignment (which also causes failures for a host that requires > alignment emulating a guest that does not). Good to know. But I think it's a good compromise between the performance and accuracy. Artyom -- Regards, Artyom Tarasenko SPARC and PPC PReP under qemu blog: http://tyom.blogspot.com/search/label/qemu
