Use OPTIONS rather than OPTIONS_GHC for pragmas

[ghc-hetmet.git] / compiler / utils / FastTypes.lhs

diff --git a/compiler/utils/FastTypes.lhs b/compiler/utils/FastTypes.lhs
index bb92c8c..dc43574 100644 (file)
--- a/compiler/utils/FastTypes.lhs
+++ b/compiler/utils/FastTypes.lhs
@@ -1,9 +1,16 @@
 %
-% (c) The University of Glasgow, 2000
+% (c) The University of Glasgow, 2000-2006
 %
 \section{Fast integers and booleans}
 
 \begin{code}
+{-# OPTIONS -w #-}
+-- The above warning supression flag is a temporary kludge.
+-- While working on this module you are encouraged to remove it and fix
+-- any warnings in the module. See
+--     http://hackage.haskell.org/trac/ghc/wiki/CodingStyle#Warnings
+-- for details
+
 module FastTypes (
     FastInt, _ILIT, iBox, iUnbox,
     (+#), (-#), (*#), quotFastInt, negateFastInt,
@@ -17,7 +24,7 @@ module FastTypes (
 #if defined(__GLASGOW_HASKELL__)
 
 -- Import the beggars
-import GLAEXTS
+import GHC.Exts
        ( Int(..), Int#, (+#), (-#), (*#), 
          quotInt#, negateInt#, (==#), (<#), (<=#), (>=#), (>#)
        )
@@ -34,6 +41,8 @@ fastBool True  = 1#
 fastBool False = 0#
 isFastTrue x = x ==# 1#
 
+-- note that fastOr and fastAnd are strict in both arguments
+-- since they are unboxed
 fastOr 1# _ = 1#
 fastOr 0# x = x
 
@@ -59,7 +68,40 @@ negateFastInt = negate
 
 type FastBool = Bool
 fastBool x = x
-_IS_TRUE_ x = x
+isFastTrue x = x
+-- make sure these are as strict as the unboxed version,
+-- so that the performance characteristics match
+fastOr False False = False
+fastOr _ _ = True
+fastAnd True True = True
+fastAnd _ _ = False
+
+--These are among the type-signatures necessary for !ghc to compile
+-- but break ghc (can't give a signature for an import...)
+--Note that the comparisons actually do return Bools not FastBools.
+(+#) :: FastInt -> FastInt -> FastInt
+(-#) :: FastInt -> FastInt -> FastInt
+(*#) :: FastInt -> FastInt -> FastInt
+(==#) :: FastInt -> FastInt -> Bool
+(<#) :: FastInt -> FastInt -> Bool
+(<=#) :: FastInt -> FastInt -> Bool
+(>=#) :: FastInt -> FastInt -> Bool
+(>#) :: FastInt -> FastInt -> Bool
 
 #endif /* ! __GLASGOW_HASKELL__ */
+
+-- type-signatures will improve the non-ghc-specific versions
+-- and keep things accurate (and ABLE to compile!)
+_ILIT :: Int -> FastInt
+iBox :: FastInt -> Int
+iUnbox :: Int -> FastInt
+
+quotFastInt :: FastInt -> FastInt -> FastInt
+negateFastInt :: FastInt -> FastInt
+
+fastBool :: Bool -> FastBool
+isFastTrue :: FastBool -> Bool
+fastOr :: FastBool -> FastBool -> FastBool
+fastAnd :: FastBool -> FastBool -> FastBool
+
 \end{code}