Broken ghc-7.0.3/vector combination?

[Simon Marlow]

On 20/04/2011 18:28, Ian Lynagh wrote:
> On Wed, Apr 20, 2011 at 05:02:50PM +0200, Daniel Fischer wrote:
>>
>> So, is it possible that some change in ghc-7.0.3 vs. the previous versions
>
> Very little changed between 7.0.2 and 7.0.3. The only thing that jumps
> out to me as possibly being relevant is:
>
> diff -ur 7.0.2/ghc-7.0.2/compiler/nativeGen/X86/Instr.hs 7.0.3/ghc-7.0.3/compiler/nativeGen/X86/Instr.hs
> --- 7.0.2/ghc-7.0.2/compiler/nativeGen/X86/Instr.hs 2011-02-28 18:10:06.000000000 +0000
> +++ 7.0.3/ghc-7.0.3/compiler/nativeGen/X86/Instr.hs 2011-03-26 18:10:04.000000000 +0000
> @@ -734,6 +734,7 @@
>        where p insn r = case insn of
>                           CALL _ _ ->  GFREE : insn : r
>                           JMP _    ->  GFREE : insn : r
> +                        JXX_GBL _ _ ->  GFREE : insn : r
>                           _        ->  insn : r

Right, it could be related to this.  However this change was made to 
eliminate some causes of NaNs, see:

http://hackage.haskell.org/trac/ghc/ticket/4914

So I'm very depressed if it managed to introduce NaNs somehow.

Could someone make a ticket for this, with the smallest test case found 
so far please?

Cheers,
	Simon