#4102: Bit manipulation built-ins
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Reporter: uzytkownik | Owner:
Type: feature request | Status: new
Priority: normal | Milestone: 6.16.1
Component: libraries/base | Version: 6.12.2
Keywords: | Testcase:
Blockedby: | Difficulty:
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: None/Unknown
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Comment(by uzytkownik):
Replying to [comment:4 gwicke]:
> I have created preliminary bindings to GCC's built-in bit operations and
exposed them in a separate typeclass. The current code is browsable at
http://hg.wikidev.net:8000/trie/file/tip/BitsX/ (see Data/Bits/Extras.hs
for the typeclass and instances), but not yet in its own repository or on
hackage.
>
> (...)
>
> A faster, more general and robust solution would probably involve the
introduction of new primops.
>
>
> Feedback on the code and suggestions for better locations in the module
hierarchy would be appreciated. I plan to publish this on hackage once
good locations are found.
I would strongly suggest Data.Bits for the following reasons:
- All of them can be implemented in terms of the Data.Bits primitives. It
is simply an extention for specialization.
- They should be handled in-line by compiler as for many architectures
they can be optimized to single instruction. LLVM inline shoul handle it
perfectly.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4102#comment:5>
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