[Haskell-cafe] Runtime strictness analysis for polymorphic HOFs?

Edward Kmett ekmett at gmail.com
Fri Jun 19 03:46:18 EDT 2009

Hi Max,
I don't have anything in a public repository at this time. I have been
exploring a series of designs in this space trying to see if any could be
applied to a system like GHC's bytecode interpreter, but up to now I've been
working mostly with cooperatively jitting x86-64 assembly to x86-64 assembly
for a possibly commercial project. I have only recently started trying to
adapt my research to a more functional setting. If you hop on #haskell some
time, I'd be happy to talk further.

-Edward Kmett

On Thu, Jun 18, 2009 at 12:30 PM, Max Bolingbroke <
batterseapower at hotmail.com> wrote:

> 2009/6/18 Edward Kmett <ekmett at gmail.com>:
> > What is interesting is in a lazy setting, if you are tracing a bytecode
> > representation that knows about allocation and thunks, you can do some
> > additional optimizations in here. If on every path to a side exit or the
> end
> > of the loop you find that the thunk is evaluated you can evaluate it
> > strictly and move its execution earlier in the trace. This gives you a
> weak
> > form of runtime strictness analysis. If the pointer to that thunk never
> > escapes, then you can unbox the contents of the thunk and operate on its
> > members in registers. Add constant folding, polyinline caching to improve
> > branch prediction for spineless tagless g-machine thunk evaluation, and
> code
> > migration to the side exits and it becomes an interesting runtime system.
> This sounds absolutely awesome! Is the source code for your prototype
> publicly available anywhere? I'd love to take a look at the basic
> structure of something like this - trace JITing is something I keep
> meaning to look at in more depth.
> Cheers,
> Max
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