On Tue, Oct 16, 2007 at 04:06:26PM +0200, Bernd Brassel wrote:
Hi Neil, hi Don!
Nice meeting you at ICFP by the way.
Can you give a specific example of what you have tried to do, and how it failed?
I have attached a short synopsis of what our Curry to Haskell conceptually does. I could explain what all the parts mean and why they are defined this way, if it is important. On first glance it looks as if we were doing unsafe things in the very worst way. But the invariants within the generated code clean up things again. E.g., the result of main does not at all depend on whether or not the program is evaluated eagerly or lazily.
I hope it is okay that I did not add any no-inline pragmata or something like that. Unfortunately, I forgot all the things we have tried more than a year ago to make optimization work.
Might I suggest, that the problem is your use of unsafePerformIO? If you use unsafePerformIO in accordance with the rules listed in the specification (which happens to be the FFI addendum), -O options will have no effect. (Not that what you are trying to do is achievable with correct use of unsafePerformIO; why do you want to do this unsafely, instead of just using 'length'? unsafePerformIO is a very slow function, remember) Stefan