#4442: Add unaligned version of indexWordArray#
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Reporter: tibbe | Owner:
Type: feature request | Status: new
Priority: normal | Milestone:
Component: libraries (other) | Version: 7.1
Keywords: | Testcase:
Blockedby: | Difficulty:
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: None/Unknown
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Description changed by igloo:
Old description:
> `indexWordArray#` takes an offset in whole words, making it impossible to
> do unaligned reads on platforms that support such reads. This has
> performance implications for some programs e.g. implementations of
> MurmurHash.
>
> I propose we add versions of `indexWord*Array` that take byte offsets.
> The user is responsible for only using those on platforms that support
> them and the implementation is free to crash if they're used elsewhere.
New description:
`indexWordArray#` takes an offset in whole words, making it impossible to
do unaligned reads on platforms that support such reads. This has
performance implications for some programs e.g. implementations of
!MurmurHash.
I propose we add versions of `indexWord*Array` that take byte offsets. The
user is responsible for only using those on platforms that support them
and the implementation is free to crash if they're used elsewhere.
--
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4442#comment:3>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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