On 12 May 2016 at 14:54, Brian Gladman <b...@gladman.plus.com> wrote:
> On 12/05/2016 12:52, 'Bill Hart' via mpir-devel wrote: > > Hi Brian, > > > > I don't think the superoptimiser can be made to run on Windows. > > Experience dictates timings are not stable enough to run a > > superoptimiser, and we don't have the resources to port it. Alex is only > > with us another month and the person we hire to replace him will be > > working on actually using the superoptimiser, not further development of > it. > > Hi Bill, > > That is disapointing. But, timing issues apart, is it written with > portability in mind? > No, that's not been possible. We had to start with an existing asm Jit library. This would need to be ported first. > > I ask because I am suspicious that unless i can run it myself, MPIR on > Windows x64 will simply not get the attention it needs in maintaining a > good level of performance. > That's possible of course. We will make the code available publicly, and you are welcome to try and port it if you want. > > We've discussed alternatives though, such as optimising it for the > > Windows ABI on Linux (i.e. feed the data in through different registers > > than normal). We haven't checked, but it seems like it might be feasible. > > At least we should be able to work as I did with Jason, that is taking > the gcc assembler, adding register exchanges, prologues and epilogues, > and then converting to Intel syntax for yasm. But I really hoped that > we might do better than this. > As I said, we might be able to. It depends how long Alex takes to finish the work he is doing, and how capable his replacement is. > > Anyway, what is the priority for new assembler code going into the MPIR > repository? I must admit that my development machine is getting rather > dated (ivybridge) so I won't be able to do much with the more recent > additions such as FMA and the like. Which is partly why I was hoping to > run the superoptimiser myself as I can't see older machines getting much > priority. > Our priority is on each of the complete microarchitecture redesigns Intel and AMD have done. However, we are severely limited in what we have access to. We have a Haswell and Jens has a Skylake. On the AMD side we have nothing recent. I'm considering purchasing a recent AMD machine and maybe later a recent Intel. > > But my three year Dell support contract ends in August so I will be > spending money on my next wokstation (yes, I have to buy my own > machines!) and it would help to know that MPIR on Windows x64 has a > future as this could influence what I do. > > with my regards, > > Brian > > -- > You received this message because you are subscribed to the Google Groups > "mpir-devel" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to mpir-devel+unsubscr...@googlegroups.com. > To post to this group, send email to mpir-devel@googlegroups.com. > Visit this group at https://groups.google.com/group/mpir-devel. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "mpir-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to mpir-devel+unsubscr...@googlegroups.com. To post to this group, send email to mpir-devel@googlegroups.com. Visit this group at https://groups.google.com/group/mpir-devel. For more options, visit https://groups.google.com/d/optout.
