[project @ 2005-02-18 15:06:45 by simonmar]

[ghc-base.git] / GHC / Word.hs

diff --git a/GHC/Word.hs b/GHC/Word.hs
index 5a13fd0..022a85e 100644 (file)
--- a/GHC/Word.hs
+++ b/GHC/Word.hs
@@ -1,4 +1,4 @@
-{-# OPTIONS -fno-implicit-prelude #-}
+{-# OPTIONS_GHC -fno-implicit-prelude #-}
 -----------------------------------------------------------------------------
 -- |
 -- Module      :  GHC.Word
@@ -16,6 +16,7 @@
 
 #include "MachDeps.h"
 
+-- #hide
 module GHC.Word (
     Word(..), Word8(..), Word16(..), Word32(..), Word64(..),
     toEnumError, fromEnumError, succError, predError)
@@ -132,12 +133,15 @@ instance Integral Word where
 
 instance Bounded Word where
     minBound = 0
+
+    -- use unboxed literals for maxBound, because GHC doesn't optimise
+    -- (fromInteger 0xffffffff :: Word).
 #if WORD_SIZE_IN_BITS == 31
-    maxBound = 0x7FFFFFFF
+    maxBound = W# (int2Word# 0x7FFFFFFF#)
 #elif WORD_SIZE_IN_BITS == 32
-    maxBound = 0xFFFFFFFF
+    maxBound = W# (int2Word# 0xFFFFFFFF#)
 #else
-    maxBound = 0xFFFFFFFFFFFFFFFF
+    maxBound = W# (int2Word# 0xFFFFFFFFFFFFFFFF#)
 #endif
 
 instance Ix Word where