[Haskell-cafe] Building Haskell Platform natively for 64bit Windows

Nicu Ionita nicu.ionita at acons.at
Tue Jun 7 20:32:48 CEST 2011

Am 07.06.2011 19:37, schrieb Andrew Coppin:
> On 06/06/2011 09:34 PM, Nicu Ionita wrote:
>> Hi,
>> Just to double check: that means, today it's not possible to generate 64
>> bit operations under Windows, including bit level .&., .|. a.s.o. (from
>> Data.Bits), and this situation will stay like this for a while.
>> I'm asking this because I'm currently writing a pure Haskell chess
>> engine based on bitboards. The bitboards are 64 bit wide and the basic
>> operations are critical for speed, which is always critical in chess
>> engines.
>> Then it looks I'll have to implement these operations in C and use FFI
>> to link them.
> No, 64-bit integer operations will /work/ just fine, regardless of 
> what platform you're on. Whether it will take advantage of 64-bit 
> operations at the machine-code level is another matter entirely.
> I'm not especially sure, but I think even in 32-bit mode, the x86 line 
> of processors supports performing 64-bit operations via MMX, SSE or 
> similar. Whether GHC is using that, I couldn't tell you.
> I suppose the ultimate answer is: Benchmark it, and see how fast it is.
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Yes, I was a little bit unclear, I wanted to say: the generated code 
does not use the 64 bit instructions (i.e. 1 instruction for .&., for 
example). Of course, it works, but I suppose, much slower then it could 
(3-4 times, for that part?)

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