[Vm-dev] Cuis now runs with latest Cog, but I don't understand
the problem we had
Juan Vuletich
JuanVuletich at zoho.com
Thu Apr 28 19:43:33 UTC 2016
Hi Nicolas,
On 4/28/2016 4:21 PM, Nicolas Cellier wrote:
>
> Hi Juan, then how do you explain:
>
> "Just to clarify: the issue was experienced only when running on Cog...
> current versions of the Stack VM performed as expected."
>
More precisely, we never experienced such problems with InterpreterVMs
built from VMMaker (for example
http://www.squeakvm.org/win32/release/Squeak4.10.2-2612.win32-i386.zip
), and we experienced them with Cog newer than #3370, built from
VMMaker-oscog, from Eliot's site. I guess code for prim 110 has diverged
between both branches.
Thanks,
Juan Vuletich
>
> 2016-04-28 21:10 GMT+02:00 Juan Vuletich <JuanVuletich at zoho.com
> <mailto:JuanVuletich at zoho.com>>:
>
>
> On 4/28/2016 2:13 PM, Phil (list) wrote:
>
>
> On Thu, 2016-04-28 at 12:58 -0400, Phil (list) wrote:
>
> On Thu, 2016-04-28 at 16:43 +0200, Clément Bera wrote:
>
> Have you tried on latest VM ? I remembered fixing a
> bug on #==
> primitive like a month ago. The problem was when
> performing #==
> primitive with the argument being a forwarder to an
> immediate.
>
> The problem still existed as of Cog #3686 (Juan found the fix
> yesterday.) On my system, Cuis last worked perfectly with
> 3370,
> mostly
> worked with 3390, somewhat worked with 3427 and did not
> work after
> that
> until we found the Character>>#= bug/fix.
>
> Just to clarify: the issue was experienced only when running
> on Cog...
> current versions of the Stack VM performed as expected.
>
>
> Fortunately I work with Gera Richarte @ Satellogic, and it didn't
> take long for him to suggest an explanation: Maybe prim 110 is
> broken in recent Cog VMs, but nobody notices it because the only
> sender is #== that is already optimized by the jitter, so prim 110
> is never really called. And I realized we can test that theory.
> First, we add this method to Character:
>
> === aCharacter
> <primitive: 110>
> self halt
>
> Then the following snippet (in latest Cuis, #2744):
>
> 0 to: 255 do: [ :i1 | 0 to: 255 do: [ :i2 | i1 = i2 ifFalse:
> [(Character value: i1) === (Character value: i2) ifTrue: [{i1.i2}
> print ]]]]
>
> prints nothing if run with Cog 3370, but prints a lot of pairs in
> more recent Cog. So I think Gera is right.
>
> Thanks,
> Juan Vuletich
>
>
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