Sun Aug 5 15:03:35 PDT 2007 [EMAIL PROTECTED]
* Make SpecConstr specialise for constant arguments again
Consider
lvl = Just True
foo :: Maybe Bool -> Int -> Int
foo (Just True) i = i
foo _ i = foo lvl i
SpecConstr should specialise foo, but it wasn't doing so (spotted
by Roman).
Reason: lvl's unfolding wasn't in the cloned version of lvl.
Solution: extend the value environment to record top-level bindings too
At the same time I made it work if 'lvl' is a lambda, in which case it
is again worth specialisg. This meant renaming ConEnv to ValueEnv,
and adding a case for 'LambdaVal'.
(To make specialisation on lambdas work properly, we have to do lambda
lifting as well, but this gets part of the way, and fixes a bug too.)
M ./compiler/specialise/SpecConstr.lhs -64 +82
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