X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2FbasicTypes%2FLiteral.lhs;h=ec1d7c473ba116c2654da7783484916beaf5802f;hb=f3399c446c7507d46d6cc550aa2fe7027dbc1b5b;hp=598b5a49170fcb58b6a54046e15c6633444907fb;hpb=c916244fe9246b4f9d88a9b1c7c9ee8c55b15696;p=ghc-hetmet.git

diff --git a/compiler/basicTypes/Literal.lhs b/compiler/basicTypes/Literal.lhs
index 598b5a4..ec1d7c4 100644
--- 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
@@ -54,7 +62,7 @@ respectively (which will be wrong on a 64-bit machine).
 
 \begin{code}
 tARGET_MIN_INT, tARGET_MAX_INT, tARGET_MAX_WORD :: Integer
-#if __GLASGOW_HASKELL__
+#ifdef __GLASGOW_HASKELL__
 tARGET_MIN_INT  = toInteger (minBound :: Int)
 tARGET_MAX_INT  = toInteger (maxBound :: Int)
 #else
@@ -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)