Using old code generator

Roman Cheplyaka roma at ro-che.info
Fri Apr 12 13:03:12 CEST 2013


Thanks Simon.

'statistics' is needed for criterion (the benchmarking tool), so yes,
I'd say it's important.

I'll add more information to the ticket later today.

Roman

* Simon Peyton-Jones <simonpj at microsoft.com> [2013-04-12 10:32:36+0000]
> I believe that the old codegen is gone altogether.
> 
> Please add to the ticket to say that it blocks compilation of a particular package (with instructions for how to reproduce). Is this an important package?
> 
> Someone should just fix the codegen!  Any volunteers?  Simon left some breadcrumbs and I'm sure would help.
> 
> 
> Simon
> 
> | -----Original Message-----
> | From: glasgow-haskell-users-bounces at haskell.org [mailto:glasgow-haskell-
> | users-bounces at haskell.org] On Behalf Of Roman Cheplyaka
> | Sent: 12 April 2013 11:27
> | To: glasgow-haskell-users at haskell.org
> | Subject: Using old code generator
> | 
> | Hi,
> | 
> | I'm looking for a workaround for #7574 [1] (I run into it when trying to
> | build the 'statistics' package with profiling enabled with GHC HEAD.)
> | 
> | The symptom is
> | 
> |   ghc-stage2: panic! (the 'impossible' happened)
> |     (GHC version 7.7.20130407 for i386-unknown-linux):
> |     allocateRegsAndSpill: Cannot read from uninitialized register
> |       %vI_cCdO
> | 
> | [1]: http://hackage.haskell.org/trac/ghc/ticket/7574
> | 
> | Do I understand correctly that this bug is specific to the new codegen?
> | If so, is it possible to ask the compiler to use the old codegen?
> | Is it okay to mix together packages compiled with both codegens?
> | 
> | Thanks,
> | Roman
> | 
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