#2325: Compile-time computations
-----------------------------------------+----------------------------------
Reporter: ajd | Owner:
Type: run-time performance bug | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 6.8.2
Severity: normal | Resolution:
Keywords: constant folding | Testcase:
Architecture: Unknown | Os: Unknown
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Changes (by dons):
* keywords: => constant folding
Comment:
I think this is specific to Integer, which is a more complex type.
If you constrain your values to be machine Int,
{{{
module M where
foo :: Int
foo = 1 + 2
}}}
Then we see the +# rule fire,
{{{
1 RuleFired
1 +#
4 BetaReduction
3 KnownBranch
9 SimplifierDone
------------------------------- Core -----------------------------------
M.foo :: Int
M.foo = I# 3
}}}
So perhaps it is a simple matter of adding these rules to the compiler.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2325#comment:1>
GHC <http://www.haskell.org/ghc/>
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