#4101: Primitive constant unfolding
---------------------------------+------------------------------------------
Reporter: malosh | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 6.12.2
Keywords: | Difficulty:
Os: Unknown/Multiple | Testcase:
Architecture: x86 | Failure: Runtime performance bug
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Description changed by igloo:
Old description:
> Examining the core generated by ghc with -O2 on a numerical code, I saw
> things like :
>
> case GHC.Prim.<## x_aB9 (GHC.Prim.**## 2.0 -1021.0) of _ {...
>
> This code being executed each time my code performs an addition ! GHC
> does not seem to unfold the constants right with at least **##. By the
> way, it should definitely be possible to specify a Double# constant in
> hexadecimal.
New description:
Examining the core generated by ghc with -O2 on a numerical code, I saw
things like :
{{{
case GHC.Prim.<## x_aB9 (GHC.Prim.**## 2.0 -1021.0) of _ {...
}}}
This code being executed each time my code performs an addition ! GHC does
not seem to unfold the constants right with at least **##. By the way, it
should definitely be possible to specify a Double# constant in
hexadecimal.
--
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4101#comment:1>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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