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[ghc-hetmet.git] / compiler / basicTypes / Literal.lhs

diff --git a/compiler/basicTypes/Literal.lhs b/compiler/basicTypes/Literal.lhs
index 598b5a4..c6782f0 100644 (file)
--- a/compiler/basicTypes/Literal.lhs
+++ b/compiler/basicTypes/Literal.lhs
@@ -5,6 +5,13 @@
 \section[Literal]{@Literal@: Machine literals (unboxed, of course)}
 
 \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/Commentary/CodingStyle#Warnings
+-- for details
+
 module Literal
        ( Literal(..)           -- Exported to ParseIface
        , mkMachInt, mkMachWord
@@ -16,6 +23,7 @@ module Literal
 
        , inIntRange, inWordRange, tARGET_MAX_INT, inCharRange
        , isZeroLit
+       , litFitsInChar
 
        , word2IntLit, int2WordLit
        , narrow8IntLit, narrow16IntLit, narrow32IntLit
@@ -284,6 +292,12 @@ litIsDupable :: Literal -> Bool
 litIsDupable (MachStr _) = False
 litIsDupable other      = True
 
+litFitsInChar :: Literal -> Bool
+litFitsInChar (MachInt i)
+                        = fromInteger i <= ord minBound 
+                        && fromInteger i >= ord maxBound 
+litFitsInChar _         = False
+
 litSize :: Literal -> Int
 -- Used by CoreUnfold.sizeExpr
 litSize (MachStr str) = 1 + ((lengthFS str + 3) `div` 4)