Simon, you give this example:
L1: ...blah blah...
CondBranch e L1 L2
L2: blah blah
and say that "(...) on the first iteration, we don't have any fact from L1. So
for backwards analysis the client really must give us a bottom element. " I
think this example does not actually demonstrate that we must have a bottom
element, because if we have fact from L2 then we still don't need bottom in the
same way we don't need it in forward analysis. We need bottom only when all
entry facts are unknown.
Janek
----- Oryginalna wiadomość -----
Od: "Simon Peyton-Jones" <[email protected]>
Do: "Simon Marlow" <[email protected]>, "Jan Stolarek" <[email protected]>
DW: "ghc-devs" <[email protected]>, [email protected], [email protected],
"Edward Z. Yang" <[email protected]>
Wysłane: czwartek, 22 sierpień 2013 17:44:11
Temat: RE: Changes in Hoopl
I have elaborated (more clearly I hope)
S
| -----Original Message-----
| From: Simon Marlow [mailto:[email protected]]
| Sent: 22 August 2013 15:14
| To: Jan Stolarek
| Cc: ghc-devs; Simon Peyton-Jones; [email protected]; [email protected];
| Edward Z. Yang
| Subject: Re: Changes in Hoopl
|
| Hi Jan,
|
| On 22/08/13 14:01, Jan Stolarek wrote:
| > Me and Simon PJ had some discussion about modifying Hoopl. I
| summarized that discussion on a wiki page:
| >
| > http://ghc.haskell.org/trac/ghc/wiki/Hoopl/Cleanup
| >
| > I'd like to implement changes once there's a consensus on which
| changes exactly do we want in Hoopl.
|
| I'm all for cleaning up Hoopl. It's definitely a bit of a mess in
| places.
|
| I read through your wiki page and I'm not entirely clear about what
| changes you're proposing. e.g. it's probably true that in forward
| analysis if you specify facts for all the input labels then fact_bot is
| never used (though I'm not 100% sure about that). But you don't say
| what you want to do with that observation. Could you list the API
| changes you want to make?
|
| Cheers,
| Simon
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