Proposal: Make intersperse lazier
Christian.Maeder at dfki.de
Tue Sep 21 05:28:46 EDT 2010
Am 21.09.2010 11:08, schrieb John Lato:
> Which compiler/version are you using for your tests? Is the behavior
> the same for other compilers/versions? In particular, is it similar for
> ghc-6.10, ghc-6.12, and ghc-HEAD?
I've used ghc-6.12.3. My top-level file is Bench.hs:
testCase f = print . length . f ','
main = do
let s = replicate 10000000 'A'
print $ length s
defaultMain [ bench "isgo" $ testCase isgo s
, bench "isrec" $ testCase isrec s ]
(using Daniel's Interspersing module)
I compiled by:
ghc -O2 -fforce-recomp -fext-core --make Bench.hs
./Bench -s 10
> When benchmarking variants like this, I'm always suspicious that my
> optimizations may be ghc-version-specific, since I've had occasional
> experience to the contrary.
Yes, and after years, you'll sometimes find out that your pragmas, bangs
and other quirks actually made things worse.
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