#4096: New primops for indexing: index*OffAddrUsing# etc
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Reporter: simonpj | Owner:
Type: feature request | Status: new
Priority: normal | Milestone: 6.16.1
Component: Compiler | Version: 6.12.2
Keywords: | Difficulty:
Os: Unknown/Multiple | Testcase:
Architecture: Unknown/Multiple | Failure: None/Unknown
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Comment(by simonmar):
Here's a thought. One alternative you suggested was
{{{
use# :: o -> o' -> o'
}}}
which is problematic because the `o'` argument/result must have open kind,
and you said the code generator doesn't seem to support this. I don't
know if this really is problematic or whether it just looks that way, but
even if it is, we could specialise `use#` to each unboxed type:
{{{
useInt# :: o -> Int# -> Int#
uneFloat# :: o -> Float# -> Float#
...
}}}
this seems slightly preferable to the `indexBlahOffAddrUsing#` family,
because there are fewer new primops, they're more generic, and they're
trivial to implement. Can you see any problems with this?
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4096#comment:3>
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