On Thu, Sep 29, 2016 at 12:55:23PM -0400, Programmingkid wrote: > > On Sep 29, 2016, at 11:41 AM, Peter Maydell wrote: > > > On 28 September 2016 at 21:17, David Gibson <da...@gibson.dropbear.id.au> > > wrote: > >> I think there is a way you could get both speed and accuracy, but it's > >> a huge project: > >> > >> You'd need to add full float awareness to TCG - so floating point TCG > >> values and floating point operations as tcp micro-ops, defined > >> according to IEEE semantics. Then you'd need to rewrite the TCG > >> frontends in terms of those new ops, at least for target CPUs close > >> enough to IEEE semantics for that to work. And you'd need to rewrite > >> the TCG backends to implement those fp ops in terms of host cpu fp > >> instructions .. at least when the host has fp behaviour close enough > >> to IEEE to make that work, with a fallback to soft float when that's > >> not the case. > > > > Also even if you have float support in both frontend and backend > > you still need to fall back to fully-emulated for the runtime > > corner cases (like where tininess before/after rounding makes a > > difference or where you need to care about minutiae of the > > floating point exception flags, etc). It's not impossible > > but it is a very large amount of technically complicated work. > > > This project sounds like it should have its own web page. Maybe even > its own Google Summer of Code entry. I created a mindmap of > this project. The picture is attached to this email. This is > just a start. Please let me know what should be added or changed.
TBH, I think this is rather bigger than a GSoC project.
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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