+-- | Optimisation fuel is used to control the amount of work the optimiser does.
+--
+-- Every optimisation step consumes a certain amount of fuel and stops when
+-- it runs out of fuel. This can be used e.g. to debug optimiser bugs: Run
+-- the optimiser with varying amount of fuel to find out the exact number of
+-- steps where a bug is introduced in the output.
module OptimizationFuel
- ( OptimizationFuel , canRewriteWithFuel, maybeRewriteWithFuel, oneLessFuel
+ ( OptimizationFuel, canRewriteWithFuel, maybeRewriteWithFuel, oneLessFuel
, OptFuelState, initOptFuelState --, setTotalFuel
, tankFilledTo, diffFuel
, FuelConsumer
--import GHC.Exts (State#)
import Panic
import Data.IORef
-import Monad
+import Control.Monad
import StaticFlags (opt_Fuel)
import UniqSupply
-- type OptimizationFuel = State# () -- would like this, but it won't work
data OptimizationFuel = OptimizationFuel
deriving Show
-tankFilledTo _ = undefined -- should be impossible to evaluate
+tankFilledTo _ = panic "tankFilledTo" -- should be impossible to evaluate
-- realWorld# might come in handy, too...
canRewriteWithFuel OptimizationFuel = True
maybeRewriteWithFuel _ ma = ma