V.enumFromTo is only fast for Int, not Word32 about vector

[basvandijk]

The problem probably occurs in Data.Vector.Fusion.Bundle.Monadic or Data.Vector.Fusion.Stream.Monad which both define RULES for enumFromTo.

[dolio]

Can you check your benchmarks with the latest vector source? I merged a patch that is supposed to have fixed some RULES.

However, I actually don't expect it to work for Word32. I've been looking at the core for a simple test, and the behavior is very strange. There's a rule for Word32 that isn't firing, but the analogous rule fires for many other cases. Int16, Word16, Word64, Int64 and Int32 all work fine, but the Word32 rule does not fire and I'm not sure why. The Word32 and Int32 rules are in the same CPP block, so I don't see what the difference is yet.

[dolio]

Never mind, I figured out the problem. WORD_SIZE_IN_BITS was undefined due to a missing MachDeps.h include.

If you try the latest, you should be getting good performance on all types, I think. If you can confirm, I'll close the bug.

[nh2]

If you try the latest

I would like to, but I cannot figure out how to install vector from git (0.11) and the benchmark at the same time:

The benchmark dependencies (criterion) have vector < 0.11 in various places. I tried Cabal's --allow-newer flag, but that seems to lift all upper bounds of all packages, which gives me another build error.

How can I lift only the upper bounds on vector?

[nh2]

While my question above persists, I managed to test this by cheating, setting vector's version to 0.10.9.100.

Benchmark results:

• Before your fix
• After your fix

So this is fixed.