On Tue, Nov 17, 2009 at 12:24 AM, Simon Peyton-Jones <simo...@microsoft.com>wrote:
> To be honest I’m not terribly enthusiastic about trying to nail down > exactly what’s happening in 6.10 and 6.12 because, although they are indeed > the compilers people will be using, it’s otherwise wasted work because the > HEAD is so different. > I don't blame you! That's completely reasonable. > Can you try with 6.12 and see if you can find a recipe that does well > enough? If you get desperate (ie there’s a huge perf bump that you can’t > eliminate) then I’ll certainly try to help. > Will do, thanks. > Meanwhile, I don’t know why 6.10 is faster than HEAD (by 25% too) and I’d > like to understand that. Can you submit a Trac ticket saying how to > reproduce? You might need to bundle up the library too, to make sure we can > reproduce it precisely. > Certainly. The test program is tiny, but because of all the inlining in the library, the simplifier output is pretty fearsome.
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